The should fix the following NPE:
```
[2019-02-11T23:27:48,452][WARN ][o.e.p.PersistentTasksNodeService] [node_s_0] task kD8YzUhHTK6uKNBNQI-1ZQ-0 failed with an exception
1> java.lang.NullPointerException: null
1> at org.elasticsearch.xpack.ccr.action.ShardFollowTasksExecutor.lambda$fetchFollowerShardInfo$7(ShardFollowTasksExecutor.java:305) ~[main/:?]
1> at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:61) [elasticsearch-8.0.0-SNAPSHOT.jar:8.0.0-SNAPSHOT]
1> at org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:68) [elasticsearch-8.0.0-SNAPSHOT.jar:8.0.0-SNAPSHOT]
1> at org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:64) [elasticsearch-8.0.0-SNAPSHOT.jar:8.0.0-SNAPSHOT]
1> at org.elasticsearch.action.support.broadcast.node.TransportBroadcastByNodeAction$AsyncAction.onCompletion(TransportBroadcastByNodeAction.java:383) [elasticsearch-8.0.0-SNAPSHOT.jar:8.0.0-SNAPSHOT]
1> at org.elasticsearch.action.support.broadcast.node.TransportBroadcastByNodeAction$AsyncAction.onNodeResponse(TransportBroadcastByNodeAction.java:352) [elasticsearch-8.0.0-SNAPSHOT.jar:8.0.0-SNAPSHOT]
1> at org.elasticsearch.action.support.broadcast.node.TransportBroadcastByNodeAction$AsyncAction$1.handleResponse(TransportBroadcastByNodeAction.java:324) [elasticsearch-8.0.0-SNAPSHOT.jar:8.0.0-SNAPSHOT]
1> at org.elasticsearch.action.support.broadcast.node.TransportBroadcastByNodeAction$AsyncAction$1.handleResponse(TransportBroadcastByNodeAction.java:314) [elasticsearch-8.0.0-SNAPSHOT.jar:8.0.0-SNAPSHOT]
1> at org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleResponse(TransportService.java:1108) [elasticsearch-8.0.0-SNAPSHOT.jar:8.0.0-SNAPSHOT]
1> at org.elasticsearch.transport.TransportService$DirectResponseChannel.processResponse(TransportService.java:1189) [elasticsearch-8.0.0-SNAPSHOT.jar:8.0.0-SNAPSHOT]
1> at org.elasticsearch.transport.TransportService$DirectResponseChannel.sendResponse(TransportService.java:1169) [elasticsearch-8.0.0-SNAPSHOT.jar:8.0.0-SNAPSHOT]
1> at org.elasticsearch.transport.TaskTransportChannel.sendResponse(TaskTransportChannel.java:54) [elasticsearch-8.0.0-SNAPSHOT.jar:8.0.0-SNAPSHOT]
1> at org.elasticsearch.action.support.broadcast.node.TransportBroadcastByNodeAction$BroadcastByNodeTransportRequestHandler.messageReceived(TransportBroadcastByNodeAction.java:417) [elasticsearch-8.0.0-SNAP
SHOT.jar:8.0.0-SNAPSHOT]
1> at org.elasticsearch.action.support.broadcast.node.TransportBroadcastByNodeAction$BroadcastByNodeTransportRequestHandler.messageReceived(TransportBroadcastByNodeAction.java:391) [elasticsearch-8.0.0-SNAP
SHOT.jar:8.0.0-SNAPSHOT]
1> at org.elasticsearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:63) [elasticsearch-8.0.0-SNAPSHOT.jar:8.0.0-SNAPSHOT]
1> at org.elasticsearch.transport.TransportService$7.doRun(TransportService.java:687) [elasticsearch-8.0.0-SNAPSHOT.jar:8.0.0-SNAPSHOT]
1> at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:751) [elasticsearch-8.0.0-SNAPSHOT.jar:8.0.0-SNAPSHOT]
1> at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) [elasticsearch-8.0.0-SNAPSHOT.jar:8.0.0-SNAPSHOT]
1> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_202]
1> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_202]
1> at java.lang.Thread.run(Thread.java:748) [?:1.8.0_202]
```
Relates to #38779
* Add rolling upgrade multi cluster test module (#38277)
This test starts 2 clusters, each with 3 nodes.
First the leader cluster is started and tests are run against it and
then the follower cluster is started and tests execute against this two cluster.
Then the follower cluster is upgraded, one node at a time.
After that the leader cluster is upgraded, one node at a time.
Every time a node is upgraded tests are ran while both clusters are online.
(and either leader cluster has mixed node versions or the follower cluster)
This commit only tests CCR index following, but could be used for CCS tests as well.
In particular for CCR, unidirectional index following is tested during a rolling upgrade.
During the test several indices are created and followed in the leader cluster before or
while the follower cluster is being upgraded.
This tests also verifies that attempting to follow an index in the upgraded cluster
from the not upgraded cluster fails. After both clusters are upgraded following the
index that previously failed should succeed.
Relates to #37231 and #38037
* Filter out upgraded version index settings when starting index following (#38838)
The `index.version.upgraded` and `index.version.upgraded_string` are likely
to be different between leader and follower index. In the event that
a follower index gets restored on a upgraded node while the leader index
is still on non-upgraded nodes.
Closes#38835
Currently we index documents concurrently to attempt to ensure that we
update mappings during the restore process. However, this does not
actually test that the mapping will be correct and is dangerous as it
can lead to a misalignment between the max sequence number and the local
checkpoint. If these are not aligned, peer recovery cannot be completed
without initiating following which this test does not do. That causes
teardown assertions to fail.
This commit removes the concurrent indexing and flushes after the
documents are indexed. Additionally it modifies the mapping specific
test to ensure that there is a mapping update when the restore session
is initiated. This mapping update is picked up at the end of the restore
by the follower.
There were two documents (seq=2 and seq=103) missing on the follower in
one of the failures of `testFailOverOnFollower`. I spent several hours
on that failure but could not figure out the reason. I adjust log and
unmute this test so we can collect more information.
Relates #38633
The Close Index API has been refactored in 6.7.0 and it now performs
pre-closing sanity checks on shards before an index is closed: the maximum
sequence number must be equals to the global checkpoint. While this is a
strong requirement for regular shards, we identified the need to relax this
check in the case of CCR following shards.
The following shards are not in charge of managing the max sequence
number or global checkpoint, which are pulled from a leader shard. They
also fetch and process batches of operations from the leader in an unordered
way, potentially leaving gaps in the history of ops. If the following shard lags
a lot it's possible that the global checkpoint and max seq number never get
in sync, preventing the following shard to be closed and a new PUT Follow
action to be issued on this shard (which is our recommended way to
resume/restart a CCR following).
This commit allows each Engine implementation to define the specific
verification it must perform before closing the index. In order to allow
following/frozen/closed shards to be closed whatever the max seq number
or global checkpoint are, the FollowingEngine and ReadOnlyEngine do
not perform any check before the index is closed.
Co-authored-by: Martijn van Groningen <martijn.v.groningen@gmail.com>
Adds the ability to fetch chunks from different files in parallel, configurable using the new `ccr.indices.recovery.max_concurrent_file_chunks` setting, which defaults to 5 in this PR.
The implementation uses the parallel file writer functionality that is also used by peer recoveries.
In #38333 and #38350 we moved away from the `discovery.zen` settings namespace
since these settings have an effect even though Zen Discovery itself is being
phased out. This change aligns the documentation and the names of related
classes and methods with the newly-introduced naming conventions.
This is related to #35975. We do not want a slow master to fail a
recovery from remote process due to a slow put mappings call. This
commit increases the master node timeout on this call to 30 mins.
Currently the snapshot/restore process manually sets the global
checkpoint to the max sequence number from the restored segements. This
does not work for Ccr as this will lead to documents that would be
recovered in the normal followering operation from being recovered.
This commit fixes this issue by setting the initial global checkpoint to
the existing local checkpoint.
With this change we no longer support pluggable discovery implementations. No
known implementations of `DiscoveryPlugin` actually override this method, so in
practice this should have no effect on the wider world. However, we were using
this rather extensively in tests to provide the `test-zen` discovery type. We
no longer need a separate discovery type for tests as we no longer need to
customise its behaviour.
Relates #38410
Introduced FollowParameters class that put follow, resume follow,
put auto follow pattern requests and follow info response classes reuse.
The FollowParameters class had the fields, getters etc. for the common parameters
that all these APIs have. Also binary and xcontent serialization /
parsing is handled by this class.
The follow, resume follow, put auto follow pattern request classes originally
used optional non primitive fields, so FollowParameters has that too and the follow info api can handle that now too.
Also the followerIndex field can in production only be specified via
the url path. If it is also specified via the request body then
it must have the same value as is specified in the url path. This
option only existed to xcontent testing. However the AbstractSerializingTestCase
base class now also supports createXContextTestInstance() to provide
a different test instance when testing xcontent, so allowing followerIndex
to be specified via the request body is no longer needed.
By moving the followerIndex field from Body to ResumeFollowAction.Request
class and not allowing the followerIndex field to be specified via
the request body the Body class is redundant and can be removed. The
ResumeFollowAction.Request class can then directly use the
FollowParameters class.
For consistency I also removed the ability to specified followerIndex
in the put follow api and the name in put auto follow pattern api via
the request body.
Renames the following settings to remove the mention of `zen` in their names:
- `discovery.zen.hosts_provider` -> `discovery.seed_providers`
- `discovery.zen.ping.unicast.concurrent_connects` -> `discovery.seed_resolver.max_concurrent_resolvers`
- `discovery.zen.ping.unicast.hosts.resolve_timeout` -> `discovery.seed_resolver.timeout`
- `discovery.zen.ping.unicast.hosts` -> `discovery.seed_addresses`
X-Pack security supports built-in authentication service
`token-service` that allows access tokens to be used to
access Elasticsearch without using Basic authentication.
The tokens are generated by `token-service` based on
OAuth2 spec. The access token is a short-lived token
(defaults to 20m) and refresh token with a lifetime of 24 hours,
making them unsuitable for long-lived or recurring tasks where
the system might go offline thereby failing refresh of tokens.
This commit introduces a built-in authentication service
`api-key-service` that adds support for long-lived tokens aka API
keys to access Elasticsearch. The `api-key-service` is consulted
after `token-service` in the authentication chain. By default,
if TLS is enabled then `api-key-service` is also enabled.
The service can be disabled using the configuration setting.
The API keys:-
- by default do not have an expiration but expiration can be
configured where the API keys need to be expired after a
certain amount of time.
- when generated will keep authentication information of the user that
generated them.
- can be defined with a role describing the privileges for accessing
Elasticsearch and will be limited by the role of the user that
generated them
- can be invalidated via invalidation API
- information can be retrieved via a get API
- that have been expired or invalidated will be retained for 1 week
before being deleted. The expired API keys remover task handles this.
Following are the API key management APIs:-
1. Create API Key - `PUT/POST /_security/api_key`
2. Get API key(s) - `GET /_security/api_key`
3. Invalidate API Key(s) `DELETE /_security/api_key`
The API keys can be used to access Elasticsearch using `Authorization`
header, where the auth scheme is `ApiKey` and the credentials, is the
base64 encoding of API key Id and API key separated by a colon.
Example:-
```
curl -H "Authorization: ApiKey YXBpLWtleS1pZDphcGkta2V5" http://localhost:9200/_cluster/health
```
Closes#34383
There are two issues regarding the way that we sync mapping from leader
to follower when a ccr restore is completed:
1. The returned mapping from a cluster service might not be up to date
as the mapping of the restored index commit.
2. We should not compare the mapping version of the follower and the
leader. They are not related to one another.
Moreover, I think we should only ensure that once the restore is done,
the mapping on the follower should be at least the mapping of the copied
index commit. We don't have to sync the mapping which is updated after
we have opened a session.
Relates #36879Closes#37887
This is related to #35975. Currently when an index falls behind a leader
it encounters a fatal exception. This commit adds a test for that
scenario. Additionally, it tests that the user can stop following, close
the follower index, and put follow again. After the indexing is
re-bootstrapped, it will recover the documents it lost in normal
following operations.
Because concurrent sync requests from a primary to its replicas could be
in flight, it can be the case that an older retention leases collection
arrives and is processed on the replica after a newer retention leases
collection has arrived and been processed. Without a defense, in this
case the replica would overwrite the newer retention leases with the
older retention leases. This commit addresses this issue by introducing
a versioning scheme to retention leases. This versioning scheme is used
to resolve out-of-order processing on the replica. We persist this
version into Lucene and restore it on recovery. The encoding of
retention leases is starting to get a little ugly. We can consider
addressing this in a follow-up.
This suite still fails one per week sometimes with a worrying assertion.
Sadly we are still unable to find the actual source.
Expected: <SeqNoStats{maxSeqNo=229, localCheckpoint=86, globalCheckpoint=86}>
but: was <SeqNoStats{maxSeqNo=229, localCheckpoint=-1, globalCheckpoint=86}>
This change enables trace log in the suite so we will have a better
picture if this fails again.
Relates #3333
This PR removes the temporary change we made to the yml test harness in #37285
to automatically set `include_type_name` to `true` in index creation requests
if it's not already specified. This is possible now that the vast majority of
index creation requests were updated to be typeless in #37611. A few additional
tests also needed updating here.
Additionally, this PR updates the test harness to set `include_type_name` to
`false` in index creation requests when communicating with 6.x nodes. This
mirrors the logic added in #37611 to allow for typeless document write requests
in test set-up code. With this update in place, we can remove many references
to `include_type_name: false` from the yml tests.
Unlike assertBusy, awaitBusy does not retry if the code-block throws an
AssertionError. A refresh in atLeastDocsIndexed can fail because we call
this method while we are closing some node in FollowerFailOverIT.
Currently we use the raw byte array length when calling the IndexInput
read call to determine how many bytes we want to read. However, due to
how BigArrays works, the array length might be longer than the reference
length. This commit fixes the issue and uses the BytesRef length when
calling read. Additionally, it expands the index follow test to index
many more documents. These documents should potentially lead to large
enough segment files to trigger scenarios where this fix matters.
Scheduler.schedule(...) would previously assume that caller handles
exception by calling get() on the returned ScheduledFuture.
schedule() now returns a ScheduledCancellable that no longer gives
access to the exception. Instead, any exception thrown out of a
scheduled Runnable is logged as a warning.
This is a continuation of #28667, #36137 and also fixes#37708.
This commit allows implementors of the `HandledTransportAction` to
specify what thread the action should be executed on. The motivation for
this commit is that certain CCR requests should be performed on the
generic threadpool.
This fixes#38027. Currently we assert that all shards have failed.
However, it is possible that some shards do not have segement files
created yet. The action that we block is fetching these segement files
so it is possible that some shards successfully recover.
This commit changes the assertion to ensure that at least some of the
shards have failed.
This commit fixes a potential race in the IndexFollowingIT. Currently it
is possible that we fetch the task metadata, it is null, and that throws
a null pointer exception. Assertbusy does not catch null pointer
exceptions. This commit assertions that the metadata is not null.
This is related to #35975. It adds a action timeout setting that allows
timeouts to be applied to the individual transport actions that are
used during a ccr recovery.
This commit modifies the put follow index action to use a
CcrRepository when creating a follower index. It routes
the logic through the snapshot/restore process. A
wait_for_active_shards parameter can be used to configure
how long to wait before returning the response.
In order to support JSON log format, a custom pattern layout was used and its configuration is enclosed in ESJsonLayout. Users are free to use their own patterns, but if smooth Beats integration is needed, they should use ESJsonLayout. EvilLoggerTests are left intact to make sure user's custom log patterns work fine.
To populate additional fields node.id and cluster.uuid which are not available at start time,
a cluster state update will have to be received and the values passed to log4j pattern converter.
A ClusterStateObserver.Listener is used to receive only one ClusteStateUpdate. Once update is received the nodeId and clusterUUid are set in a static field in a NodeAndClusterIdConverter.
Following fields are expected in JSON log lines: type, tiemstamp, level, component, cluster.name, node.name, node.id, cluster.uuid, message, stacktrace
see ESJsonLayout.java for more details and field descriptions
Docker log4j2 configuration is now almost the same as the one use for ES binary.
The only difference is that docker is using console appenders, whereas ES is using file appenders.
relates: #32850
If the index request is executed before the mapping update is applied on
the IndexShard, the index request will perform a dynamic mapping update.
This mapping update will be timeout (i.e, ProcessClusterEventTimeoutException)
because the latch is not open. This leads to the failure of the index
request and the test. This commit makes sure the mapping is ready
before we execute the index request.
Closes#37807
* Changed `LuceneSnapshot` to throw an `OperationsMissingException` if the requested ops are missing.
* Changed the shard changes api to handle the `OperationsMissingException` and wrap the exception into `ResourceNotFound` exception and include metadata to indicate the requested range can no longer be retrieved.
* Changed `ShardFollowNodeTask` to handle this `ResourceNotFound` exception with the included metdata header.
Relates to #35975
Replace `threadPool().schedule()` / catch
`EsRejectedExecutionException` pattern with direct calls to
`ThreadPool#scheduleUnlessShuttingDown()`.
Closes#36318
The TransportUnfollowAction updates the index settings but does not
increase the settings version to reflect that change.
This issue has been caught while working on the replication of closed
indices (#33888). The IndexFollowingIT.testUnfollowIndex() started to
fail and this specific assertion tripped. It does not happen on master
branch today because index metadata for closed indices are never
updated in IndexService instances, but this is something that is going
to change with the replication of closed indices.
Today, the mapping on the follower is managed and replicated from its
leader index by the ShardFollowTask. Thus, we should prevent users
from modifying the mapping on the follower indices.
Relates #30086
The filtering by follower index was completely broken.
Also the wrong persistent tasks were selected, causing the
wrong status to be reported.
Closes#37738
Today we keep the mapping on the follower in sync with the leader's
using the mapping version from changes requests. There are two rare
cases where the mapping on the follower is not synced properly:
1. The returned mapping version (from ClusterService) is outdated than
the actual mapping. This happens because we expose the latest cluster
state in ClusterService after applying it to IndexService.
2. It's possible for the FollowTask to receive an outdated mapping than
the min_required_mapping. In that case, it should fetch the mapping
again; otherwise, the follower won't have the right mapping.
Relates to #31140
The integ tests currently use the raw zip project name as the
distribution type. This commit simplifies this specification to be
"default" or "oss". Whether zip or tar is used should be an internal
implementation detail of the integ test setup, which can (in the future)
be platform specific.
Currently we add the CcrRestoreSourceService as a index event
listener. However, if ccr is disabled, this service is null and we
attempt to add a null listener throwing an exception. This commit only
adds the listener if ccr is enabled.
This is related to #35975. This commit adds timeout functionality to
the local session on a leader node. When a session is started, a timeout
is scheduled using a repeatable runnable. If the session is not accessed
in between two runs the session is closed. When the sssion is closed,
the repeating task is cancelled.
Additionally, this commit moves session uuid generation to the leader
cluster. And renames the PutCcrRestoreSessionRequest to
StartCcrRestoreSessionRequest to reflect that change.
* Add ccr follow info api
This api returns all follower indices and per follower index
the provided parameters at put follow / resume follow time and
whether index following is paused or active.
Closes#37127
* iter
* [DOCS] Edits the get follower info API
* [DOCS] Fixes link to remote cluster
* [DOCS] Clarifies descriptions for configured parameters
Commit #37535 removed an internal restore request in favor of the
RestoreSnapshotRequest. Commit #37449 added a new test that used the
internal restore request. This commit modifies the new test to use the
RestoreSnapshotRequest.
The AbstracLifecycleComponent used to extend AbstractComponent, so it had to pass settings to the constractor of its supper class.
It no longer extends the AbstractComponent so there is no need for this constructor
There is also no need for AbstracLifecycleComponent subclasses to have Settings in their constructors if they were only passing it over to super constructor.
This is part 1. which will be backported to 6.x with a migration guide/deprecation log.
part 2 will have this constructor removed in 7
relates #35560
relates #34488
Currently when there are no more auto follow patterns for a remote cluster then
the AutoFollower instance for this remote cluster will be removed. If
a new auto follow pattern for this remote cluster gets added quickly enough
after the last delete then there may be two AutoFollower instance running
for this remote cluster instead of one.
Each AutoFollower instance stops automatically after it sees in the
start() method that there are no more auto follow patterns for the
remote cluster it is tracking. However when an auto follow pattern
gets removed and then added back quickly enough then old AutoFollower
may never detect that at some point there were no auto follow patterns
for the remote cluster it is monitoring. The creation and removal of
an AutoFollower instance happens independently in the `updateAutoFollowers()`
as part of a cluster state update.
By adding the `removed` field, an AutoFollower instance will not miss the
fact there were no auto follow patterns at some point in time. The
`updateAutoFollowers()` method now marks an AutoFollower instance as
removed when it sees that there are no more patterns for a remote cluster.
The updateAutoFollowers() method can then safely start a new AutoFollower
instance.
Relates to #36761
* Default include_type_name to false for get and put mappings.
* Default include_type_name to false for get field mappings.
* Add a constant for the default include_type_name value.
* Default include_type_name to false for get and put index templates.
* Default include_type_name to false for create index.
* Update create index calls in REST documentation to use include_type_name=true.
* Some minor clean-ups around the get index API.
* In REST tests, use include_type_name=true by default for index creation.
* Make sure to use 'expression == false'.
* Clarify the different IndexTemplateMetaData toXContent methods.
* Fix FullClusterRestartIT#testSnapshotRestore.
* Fix the ml_anomalies_default_mappings test.
* Fix GetFieldMappingsResponseTests and GetIndexTemplateResponseTests.
We make sure to specify include_type_name=true during xContent parsing,
so we continue to test the legacy typed responses. XContent generation
for the typeless responses is currently only covered by REST tests,
but we will be adding unit test coverage for these as we implement
each typeless API in the Java HLRC.
This commit also refactors GetMappingsResponse to follow the same appraoch
as the other mappings-related responses, where we read include_type_name
out of the xContent params, instead of creating a second toXContent method.
This gives better consistency in the response parsing code.
* Fix more REST tests.
* Improve some wording in the create index documentation.
* Add a note about types removal in the create index docs.
* Fix SmokeTestMonitoringWithSecurityIT#testHTTPExporterWithSSL.
* Make sure to mention include_type_name in the REST docs for affected APIs.
* Make sure to use 'expression == false' in FullClusterRestartIT.
* Mention include_type_name in the REST templates docs.
This is related to #35975. It implements a file based restore in the
CcrRepository. The restore transfers files from the leader cluster
to the follower cluster. It does not implement any advanced resiliency
features at the moment. Any request failure will end the restore.
Fail with a 403 when indexing a document directly into a follower index.
In order to test this change, I had to move specific assertions into a dedicated class and
disable assertions for that class in the rest qa module. I think that is the right trade off.
If a running shard follow task needs to be restarted and
the remote connection seeds have changed then
a shard follow task currently fails with a fatal error.
The change creates the remote client lazily and adjusts
the errors a shard follow task should retry.
This issue was found in test failures in the recently added
ccr rolling upgrade tests. The reason why this issue occurs
more frequently in the rolling upgrade test is because ccr
is setup in local mode (so remote connection seed will become stale) and
all nodes are restarted, which forces the shard follow tasks to get
restarted at some point during the test. Note that these tests
cannot be enabled yet, because this change will need to be backported
to 6.x first. (otherwise the issue still occurs on non upgraded nodes)
I also changed the RestartIndexFollowingIT to setup remote cluster
via persistent settings and to also restart the leader cluster. This
way what happens during the ccr rolling upgrade qa tests, also happens
in this test.
Relates to #37231
This commit implements a straightforward approach to retention lease
expiration. Namely, we inspect which leases are expired when obtaining
the current leases through the replication tracker. At that moment, we
clean the map that persists the retention leases in memory.
This commit is the first in a series which will culminate with
fully-functional shard history retention leases.
Shard history retention leases are aimed at preventing shard history
consumers from having to fallback to expensive file copy operations if
shard history is not available from a certain point. These consumers
include following indices in cross-cluster replication, and local shard
recoveries. A future consumer will be the changes API.
Further, index lifecycle management requires coordinating with some of
these consumers otherwise it could remove the source before all
consumers have finished reading all operations. The notion of shard
history retention leases that we are introducing here will also be used
to address this problem.
Shard history retention leases are a property of the replication group
managed under the authority of the primary. A shard history retention
lease is a combination of an identifier, a retaining sequence number, a
timestamp indicating when the lease was acquired or renewed, and a
string indicating the source of the lease. Being leases they have a
limited lifespan that will expire if not renewed. The idea of these
leases is that all operations above the minimum of all retaining
sequence numbers will be retained during merges (which would otherwise
clear away operations that are soft deleted). These leases will be
periodically persisted to Lucene and restored during recovery, and
broadcast to replicas under certain circumstances.
This commit is merely putting the basics in place. This first commit
only introduces the concept and integrates their use with the soft
delete retention policy. We add some tests to demonstrate the basic
management is correct, and that the soft delete policy is correctly
influenced by the existence of any retention leases. We make no effort
in this commit to implement any of the following:
- timestamps
- expiration
- persistence to and recovery from Lucene
- handoff during primary relocation
- sharing retention leases with replicas
- exposing leases in shard-level statistics
- integration with cross-cluster replication
These will occur individually in follow-up commits.
In Lucene 8 searches can skip non-competitive hits if the total hit count is not requested.
It is also possible to track the number of hits up to a certain threshold. This is a trade off to speed up searches while still being able to know a lower bound of the total hit count. This change adds the ability to set this threshold directly in the track_total_hits search option. A boolean value (true, false) indicates whether the total hit count should be tracked in the response. When set as an integer this option allows to compute a lower bound of the total hits while preserving the ability to skip non-competitive hits when enough matches have been collected.
Relates #33028
Today the routing of a SourceToParse is assigned in a separate step
after the object is created. We can easily forget to set the routing.
With this commit, the routing must be provided in the constructor of
SourceToParse.
Relates #36921
The AutoFollowCoordinator should be resilient to the fact that the follower
index has already been created and in that case it should only update
the auto follow metadata with the fact that the follower index was created.
Relates to #33007
Currently auto follow stats users are unable to see whether an auto follow
error was recent or old. The new timestamp field will help user distinguish
between old and new errors.
Both index following and auto following should be resilient against missing remote connections.
This happens in the case that they get accidentally removed by a user. When this happens
auto following and index following will retry to continue instead of failing with unrecoverable exceptions.
Both the put follow and put auto follow APIs validate whether the
remote cluster connection. The logic added in this change only exists
in case during the lifetime of a follower index or auto follow pattern
the remote connection gets removed. This retry behavior similar how CCR
deals with authorization errors.
Closes#36667Closes#36255
This commit adds a RemoteClusterAwareRequest interface that allows a
request to specify which remote node it should be routed to. The remote
cluster aware client will attempt to route the request directly to this
node. Otherwise it will send it as a proxy action to eventually end up
on the requested node.
It implements the ccr clean_session action with this client.
This is related to #35975. When the shard restore process is complete,
the index mappings need to be updated to ensure that the data in the
files restores is compatible with the follower mappings. This commit
implements a mapping update as the final step in a shard restore.
Currently if a leader index with soft deletes disabled is auto followed then this index is silently ignored.
This commit changes this behavior to mark these indices as auto followed and report an error, which is visible in auto follow stats. Marking the index as auto follow is important, because otherwise the auto follower will continuously try to auto follow and fail.
Relates to #33007
This commit is related to #36127. It adds a CcrRestoreSourceService to
track Engine.IndexCommitRef need for in-process file restores. When a
follower starts restoring a shard through the CcrRepository it opens a
session with the leader through the PutCcrRestoreSessionAction. The
leader responds to the request by telling the follower what files it
needs to fetch for a restore. This is not yet implemented.
Once, the restore is complete, the follower closes the session with the
DeleteCcrRestoreSessionAction action.
Currently, the CcrRepositoryManger only listens for settings updates
and installs new repositories. It does not install the repositories that
are in the initial settings. This commit, modifies the manager to
install the initial repositories. Additionally, it modifies the ccr
integration test to configure the remote leader node at startup, instead
of using a settings update.
For each remote cluster the auto follow coordinator, starts an auto
follower that checks the remote cluster state and determines whether an
index needs to be auto followed. The time since last auto follow is
reported per remote cluster and gives insight whether the auto follow
process is alive.
Relates to #33007
Originates from #35895
If a primary promotion happens in the test testAddRemoveShardOnLeader, the
max_seq_no_of_updates_or_deletes on a new primary might be higher than the
max_seq_no_of_updates_or_deletes on the replicas or copies of the follower.
Relates #36607
This commit add support for using sequence numbers to power [optimistic concurrency control](http://en.wikipedia.org/wiki/Optimistic_concurrency_control)
in the delete and index transport actions and requests. A follow up will come with adding sequence
numbers to the update and get results.
Relates #36148
Relates #10708
For class fields of type collection whose order is not important
and for which duplicates are not permitted we declare them as `Set`s.
Usually the definition is a `HashSet` but in this case `TreeSet` is used
instead to aid testing.
* Enable parallel restore operations
* Add uuid to restore in progress entries to uniquely identify them
* Adjust restore in progress entries to be a map in cluster state
* Added tests for:
* Parallel restore from two different snapshots
* Parallel restore from a single snapshot to different indices to test uuid identifiers are correctly used by `RestoreService` and routing allocator
* Parallel restore with waiting for completion to test transport actions correctly use uuid identifiers
testFailLeaderReplicaShard periodically fails because we concurrently
index to the leader group and close one of its replicas. If a
replication request hits a closing shard, we will fail that shard;
however, failing a shard is supported by the test framework - this makes
the test fail.
This commit add support to engine operations for resolving and verifying the sequence number and
primary term of the last modification to a document before performing an operation. This is
infrastructure to move our (optimistic concurrency control)[http://en.wikipedia.org/wiki/Optimistic_concurrency_control] API to use sequence numbers instead of internal versioning.
Relates #36148
Relates #10708
Changed AutofollowCoordinator makes use of the wait_for_metadata_version
feature in cluster state API and removed hard coded poll interval.
Originates from #35895
Relates to #33007
The auto follow coordinator keeps track of the UUIDs of indices that it has followed. The index UUID strings need to be cleaned up in the case that these indices are removed in the remote cluster.
Relates to #33007
1. CCR tests work without any changes
2. `testDanglingIndices` require changes the source code (added TODO).
3. `testIndexDeletionWhenNodeRejoins` because it's using just two
nodes, adding the node to exclusions is needed on restart.
4. `testCorruptTranslogTruncationOfReplica` starts dedicated master
one, because otherwise, the cluster does not form, if nodes are stopped
and one node is started back.
5. `testResolvePath` needs TEST cluster, because all nodes are stopped
at the end of the test and it's not possible to perform checks needed
by SUITE cluster.
6. `SnapshotDisruptionIT`. Without changes, the test fails because Zen2
retries snapshot creation as soon as network partition heals. This
results into the race between creating snapshot and test cleanup logic
(deleting index). Zen1 on the
other hand, also schedules retry, but it takes some time after network
partition heals, so cleanup logic executes latter and test passes. The
check that snapshot is eventually created is added to
the end of the test.
Renamed the follow qa modules:
`multi-cluster-downgraded-to-basic-license` to `downgraded-to-basic-license`
`multi-cluster-with-non-compliant-license` to `non-compliant-license`
`multi-cluster-with-security` to `security`
Moved the `chain` module into the `multi-cluster` module and
changed the `multi-cluster` to start 3 clusters.
Followup from #36031
This is related to #35975. It implements a basic restore functionality
for the CcrRepository. When the restore process is kicked off, it
configures the new index as expected for a follower index. This means
that the index has a different uuid, the version is not incremented, and
the Ccr metadata is installed.
When the restore shard method is called, an empty shard is initialized.
In #34474, we added a new assertion to ensure that the
LocalCheckpointTracker is always consistent with Lucene index. However,
we reset LocalCheckpoinTracker in testDedupByPrimaryTerm cause this
assertion to be violated.
This commit removes resetCheckpoint from LocalCheckpointTracker and
rewrites testDedupByPrimaryTerm without resetting the local checkpoint.
Relates #34474
This commit moves back to use explicit dependsOn for test tasks on
check. Not all tasks extending RandomizedTestingTask should be run by
check directly.
This commit changes the format of the `hits.total` in the search response to be an object with
a `value` and a `relation`. The `value` indicates the number of hits that match the query and the
`relation` indicates whether the number is accurate (in which case the relation is equals to `eq`)
or a lower bound of the total (in which case it is equals to `gte`).
This change also adds a parameter called `rest_total_hits_as_int` that can be used in the
search APIs to opt out from this change (retrieve the total hits as a number in the rest response).
Note that currently all search responses are accurate (`track_total_hits: true`) or they don't contain
`hits.total` (`track_total_hits: true`). We'll add a way to get a lower bound of the total hits in a
follow up (to allow numbers to be passed to `track_total_hits`).
Relates #33028
This is a follow-up to #36086. It renames the internal repository
actions to be prefixed by "internal". This allows the system user to
execute the actions.
Additionally, this PR stops casting Client to NodeClient. The client we
have is a NodeClient so executing the actions will be local.
and replaced poll interval setting with a hardcoded poll interval.
The hard coded interval will be removed in a follow up change to make
use of cluster state API's wait_for_metatdata_version.
Before the auto following was bootstrapped from thread pool scheduler,
but now auto followers for new remote clusters are bootstrapped when
a new cluster state is published.
Originates from #35895
Relates to #33007
Closes#35435
- make it easier to add additional testing tasks with the proper configuration and add some where they were missing.
- mute or fix failing tests
- add a check as part of testing conventions to find classes not included in any testing task.
This commit replaces usages of Streamable with Writeable for the
BaseTasksResponse / TransportTasksAction classes and subclasses of
these classes.
Note that where possible response fields were made final.
Relates to #34389
The current response format is:
```
{
"pattern1": {
...
},
"pattern2": {
...
}
}
```
The new format is:
```
{
"patterns": [
{
"name": "pattern1",
"pattern": {
...
}
},
{
"name": "pattern2",
"pattern": {
...
}
}
]
}
```
This format is more structured and more friendly for parsing and generating specs.
This is a breaking change, but it is better to do this now while ccr
is still a beta feature than later.
Follow up from #36049
This commit adds an empty CcrRepository snapshot/restore repository.
When a new cluster is registered in the remote cluster settings, a new
CcrRepository is registered for that cluster.
This is implemented using a new concept of "internal repositories".
RepositoryPlugin now allows implementations to return factories for
"internal repositories". The "internal repositories" are different from
normal repositories in that they cannot be registered through the
external repository api. Additionally, "internal repositories" are local
to a node and are not stored in the cluster state.
The repository will be unregistered if the remote cluster is removed.
It is important that all shards of a given index have the same
`indexCreatedVersionMajor` to Lucene, or eg. merging those shards is going to
be considered illegal. At the moment, we use the latest Lucene version when
creating a shard, which could cause shards to have different created versions
eg. in case of forced allocation. This commit makes sure to reuse the
appropriate Lucene version in order to avoid such issues.
Closes#33826
AutoFollowCoordinator should take into account that after auto following
an index and while updating that a leader index has been followed, that
the auto follow pattern may have been removed via delete auto follow patterns
api.
Also fixed a bug that when a remote cluster connection has been removed,
the auto follow coordinator does not die when it tries get a remote client for
that cluster.
Closes#35480
* Replace Streamable w/ Writeable in BaseTasksRequest and subclasses
This commit replaces usages of Streamable with Writeable for the
BaseTasksRequest / TransportTasksAction classes and subclasses of
these classes.
Relates to #34389
Some tests kill nodes and otherwise it would take 60s by default
for replicas to get allocated and that is longer than we wait
for getting in a green state in tests.
Relates to #35403
Today the default for USE_ZEN2 is false and it is overridden in many places. By
defaulting it to true we can be sure that the only places in which Zen2 does
not work are those in which it is explicitly set to false.
This change adds an extra check that verifies that all primary shards
have been started of an index that is about to be auto followed.
If not all primary shards have been started for an index
then the next auto follow run will try to follow to auto follow
this index again.
Closes#35480
When there is no persistent tasks metadata we could hit a null pointer
exception when executing a follower stats request. This is because we
inspect the persistent tasks metadata. Yet, if no tasks have been
registered, this is null (as opposed to empty). We need to avoid
de-referencing the persistent tasks metadata in this case. That is what
this commit does, and we add a test for this situation.
Currently there is a common NPE in the IndexFollowingIT that does not
indicate the test failing. This is when a cluster state listener is
called and certain index metadata is not yet available.
This commit checks that the metadata is not null before performing the
logic that depends on the metadata.
Removed extending of AbstractComponent and changed logger usage to
explicit declaration. Abstract classes still have logger
declaration using this.getClass() in order to show implementation class
name in its logs.
See #34488
avoid the assertions that check the log files, because that does not work on Windows.
The rest of the test is still useful and should work on Windows CI.
Currently on Windows CI this qa module fails because there is just one test and
that test si ignored if OS is Windows.
Validate remote cluster license as part of put auto follow pattern api call
in addition of validation that when auto follow coordinator starts auto
following indices in the leader cluster.
Also added qa module that tests what happens to ccr after downgrading to basic license.
Existing active follow indices should remain to follow,
but the auto follow feature should not pickup new leader indices.
Adjust list of dynamic index settings that should be replicated
and added a test that verifies whether builtin dynamic index settings
are classified as replicated or non replicated (whitelisted).
This commit uses the index settings version so that a follower can
replicate index settings changes as needed from the leader.
Co-authored-by: Martijn van Groningen <martijn.v.groningen@gmail.com>
An auto follow pattern:
* cannot start with `_`
* cannot contain a `,`
* can be encoded in UTF-8
* the length of UTF-8 encoded bytes is no longer than 255 bytes
In order to start shard follow tasks, the resume follow api already
needs execute N requests to the elected master node.
The pause follow API is also a master node action, which would make
how both APIs execute more consistent.
Error was thrown if leader index had no soft deletes enabled, but it then continued creating the follower index.
The test caught this bug, but very rarely due to timing issue.
Build failure instance:
```
1> [2018-11-05T20:29:38,597][INFO ][o.e.x.c.LocalIndexFollowingIT] [testDoNotCreateFollowerIfLeaderDoesNotHaveSoftDeletes] before test
1> [2018-11-05T20:29:38,599][INFO ][o.e.c.s.ClusterSettings ] [node_s_0] updating [cluster.remote.local.seeds] from [[]] to [["127.0.0.1:9300"]]
1> [2018-11-05T20:29:38,599][INFO ][o.e.c.s.ClusterSettings ] [node_s_0] updating [cluster.remote.local.seeds] from [[]] to [["127.0.0.1:9300"]]
1> [2018-11-05T20:29:38,609][INFO ][o.e.c.m.MetaDataCreateIndexService] [node_s_0] [leader-index] creating index, cause [api], templates [random-soft-deletes-templat
e, one_shard_index_template], shards [2]/[0], mappings []
1> [2018-11-05T20:29:38,628][INFO ][o.e.c.r.a.AllocationService] [node_s_0] Cluster health status changed from [YELLOW] to [GREEN] (reason: [shards started [[leader-
index][0]] ...]).
1> [2018-11-05T20:29:38,660][INFO ][o.e.x.c.a.TransportPutFollowAction] [node_s_0] [follower-index] creating index, cause [ccr_create_and_follow], shards [2]/[0]
1> [2018-11-05T20:29:38,675][INFO ][o.e.c.s.ClusterSettings ] [node_s_0] updating [cluster.remote.local.seeds] from [["127.0.0.1:9300"]] to [[]]
1> [2018-11-05T20:29:38,676][INFO ][o.e.c.s.ClusterSettings ] [node_s_0] updating [cluster.remote.local.seeds] from [["127.0.0.1:9300"]] to [[]]
1> [2018-11-05T20:29:38,678][INFO ][o.e.x.c.LocalIndexFollowingIT] [testDoNotCreateFollowerIfLeaderDoesNotHaveSoftDeletes] after test
1> [2018-11-05T20:29:38,678][INFO ][o.e.x.c.LocalIndexFollowingIT] [testDoNotCreateFollowerIfLeaderDoesNotHaveSoftDeletes] [LocalIndexFollowingIT#testDoNotCreateFoll
owerIfLeaderDoesNotHaveSoftDeletes]: cleaning up after test
1> [2018-11-05T20:29:38,678][INFO ][o.e.c.m.MetaDataDeleteIndexService] [node_s_0] [follower-index/TlWlXp0JSVasju2Kr_hksQ] deleting index
1> [2018-11-05T20:29:38,678][INFO ][o.e.c.m.MetaDataDeleteIndexService] [node_s_0] [leader-index/FQ6EwIWcRAKD8qvOg2eS8g] deleting index
FAILURE 0.23s J0 | LocalIndexFollowingIT.testDoNotCreateFollowerIfLeaderDoesNotHaveSoftDeletes <<< FAILURES!
> Throwable #1: java.lang.AssertionError:
> Expected: <false>
> but: was <true>
> at __randomizedtesting.SeedInfo.seed([7A3C89DA3BCA17DD:65C26CBF6FEF0B39]:0)
> at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
> at org.elasticsearch.xpack.ccr.LocalIndexFollowingIT.testDoNotCreateFollowerIfLeaderDoesNotHaveSoftDeletes(LocalIndexFollowingIT.java:83)
> at java.lang.Thread.run(Thread.java:748)
```
Build failure: https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+6.5+intake/46/console
The suite FollowerFailOverIT is failing because some documents are not
replicated to the follower. Maybe the FollowTask is not working as
expected or the background indexers eat all resources while the follower
cluster is trying to reform after a failover; then CI is not fast enough
to replicate all the indexed docs within 60 seconds (sometimes I see 80k
docs on the leader).
This commit limits the number of documents to be indexed into the leader
index by the background threads so that we can eliminate the latter
case. This change also replaces a docCount assertion with a docIds
assertion so we can have more information if these tests fail again.
Relates #33337
Only the response classes of get auto follow pattern, the follow and stats APIs
were moved away from Streamable. The other APIs use `AcknowledgedResponse`
or `BaseTasksResponse` as response class and
moving that class away from Streamable is a bigger change.
Stop passing `Settings` to `AbstractComponent`'s ctor. This allows us to
stop passing around `Settings` in a *ton* of places. While this change
touches many files, it touches them all in fairly small, mechanical
ways, doing a few things per file:
1. Drop the `super(settings);` line on everything that extends
`AbstractComponent`.
2. Drop the `settings` argument to the ctor if it is no longer used.
3. If the file doesn't use `logger` then drop `extends
AbstractComponent` from it.
4. Clean up all compilation failure caused by the `settings` removal
and drop any now unused `settings` isntances and method arguments.
I've intentionally *not* removed the `settings` argument from a few
files:
1. TransportAction
2. AbstractLifecycleComponent
3. BaseRestHandler
These files don't *need* `settings` either, but this change is large
enough as is.
Relates to #34488
Only the follow stats request couldn't be changed to use Writeable serialization,
because that requires changes in `TransportTasksAction` and `BaseTasksRequest` base classes.
This commit fixes two issues with the CCR API specification:
- remove the CCR stats endpoint, it is not currently implemented
- fix the documentation links
* Changed the auto follow stats to also include follow stats.
* Renamed the auto follow stats api to stats api and changed its url path
from `/_ccr/auto_follow/stats` `/_ccr/stats`.
* Removed `/_ccr/stats` url path for the follow stats api, which makes
the index parameter a required parameter.
* Fixed docs.
Index shard stats for the follower shard are fetched, when a shard follow task is started.
This is needed in order to bootstap the shard follow task with the follower global checkpoint.
Sometimes index shard stats are not available (e.g. during a restart) and
we fail now, while it is very likely that these stats will be available some time later.
This limit is based on the size in bytes of the operations in the write buffer. If this limit is exceeded then no more read operations will be coordinated until the size in bytes of the write buffer has dropped below the configured write buffer size limit.
Renamed existing `max_write_buffer_size` to ``max_write_buffer_count` to indicate that limit is count based.
Closes#34705
We should not create a follower index and abort a follow request if the
leader does not have soft-deletes. Moreover, we also should not
auto-follow an index if it does not have soft-deletes.
With this change, we apply the common test config automatically to all
newly created tasks instead of opting in specifically.
For plugin authors using the plugin externally this means that the
configuration will be applied to their RandomizedTestingTasks as well.
The purpose of the task is to simplify setup and make it easier to
change projects that use the `test` task but actually run integration
tests to use a task called `integTest` for clarity, but also because
we may want to configure and run them differently.
E.x. using different levels of concurrency.
Per #31717 this commit changes the defaults to the following:
Batch size of 5120 ops.
Maximum of 12 concurrent read requests.
Maximum of 9 concurrent write requests.
This is not necessarily our final values but it's good to have these as defaults for the purposes of initial testing.
* Change the `TransportPauseFollowAction` to extend from `TransportMasterNodeAction`
instead of `HandledAction`, this removes a sync cluster state api call.
* Introduced `ResponseHandler` that removes duplicated code in `TransportPauseFollowAction` and
`TransportResumeFollowAction`.
* Changed `PauseFollowAction.Request` to not use `readFrom()`.
Both testFollowIndexAndCloseNode and testFailOverOnFollower failed
because they responded to the FollowTask a TransportService closed
exception which is currently considered as a fatal error. This behavior
is not desirable since a closing node can throw that exception, and we
should retry in that case.
This change adds TransportService closed error to the list of retryable
errors.
Closes#34694
As part of this change the leader index name and leader cluster name are
stored in the CCR metadata in the follow index. The resume follow api
will read that when a resume follow request is executed.
Since #34412 and #34474, a follower must have soft-deletes enabled
to work correctly. This change requires soft-deletes on the follower.
Relates #34412
Relates #34474
* Changed the resource id of auto follow patterns to be a user defined name
instead of being the leader cluster alias name.
* Fail when an unfollowed leader index matches with two or more auto follow patterns.
We should be consistent here. We were already using the casing "Ccr" and
this is the preferred casing for Java class names. This commit adjusts
the names of some classes that were using the casing "CCR" to be "Ccr".
In some of our X-Pack REST tests we have to wait for pending tasks to
complete. We are now needing this functionality in ESRestTestCase for
the docs tests where we run against X-Pack features. This commit moves
the helper method that we have in X-Pack to ESRestTestCase, and removes
duplicate logic from waiting for rollup tasks to complete.
Since #34288, we might hit deadlock if the FollowTask has more fetchers
than writers. This can happen in the following scenario:
Suppose the leader has two operations [seq#0, seq#1]; the FollowTask has
two fetchers and one writer.
1. The FollowTask issues two concurrent fetch requests: {from_seq_no: 0,
num_ops:1} and {from_seq_no: 1, num_ops:1} to read seq#0 and seq#1
respectively.
2. The second request which fetches seq#1 completes before, and then it
triggers a write request containing only seq#1.
3. The primary of a follower fails after it has replicated seq#1 to
replicas.
4. Since the old primary did not respond, the FollowTask issues another
write request containing seq#1 (resend the previous write request).
5. The new primary has seq#1 already; thus it won't replicate seq#1 to
replicas but will wait for the global checkpoint to advance at least
seq#1.
The problem is that the FollowTask has only one writer and that writer
is waiting for seq#0 which won't be delivered until the writer completed.
This PR proposes to replicate existing operations with the old primary
term (instead of the current term) on the follower. In particular, when
the following primary detects that it has processed an process already,
it will look up the term of an existing operation with the same seq_no
in the Lucene index, then rewrite that operation with the old term
before replicating it to the following replicas. This approach is
wait-free but requires soft-deletes on the follower.
Relates #34288
Today we rely on the LocalCheckpointTracker to ensure no duplicate when
enabling optimization using max_seq_no_of_updates. The problem is that
the LocalCheckpointTracker is not fully reloaded when opening an engine
with an out-of-order index commit. Suppose the starting commit has seq#0
and seq#2, then the current LocalCheckpointTracker would return "false"
when asking if seq#2 was processed before although seq#2 in the commit.
This change scans the existing sequence numbers in the starting commit,
then marks these as completed in the LocalCheckpointTracker to ensure
the consistent state between LocalCheckpointTracker and Lucene commit.
This change makes it no longer possible to follow / auto follow without
specifying a leader cluster. If a local index needs to be followed
then `cluster.remote.*.seeds` should point to nodes in the local cluster.
Closes#34258
The `AutoFollowTests` needs to restart the clusters between each tests, because
it is using auto follow stats in assertions. Auto follow stats are only reset
by stopping the elected master node.
Extracted the `testGetOperationsBasedOnGlobalSequenceId()` test to its own test, because it just tests the shard changes api.
* Renamed AutoFollowTests to AutoFollowIT, because it is an integration test.
Renamed ShardChangesIT to IndexFollowingIT, because shard changes it the name
of an internal api and isn't a good name for an integration test.
* move creation of NodeConfigurationSource to a seperate method
* Fixes issues after merge, moved assertSeqNos() and assertSameDocIdsOnShards() methods from ESIntegTestCase to InternalTestCluster, so that ccr tests can use these methods too.
Today we rewrite the operations from the leader with the term of the
following primary because the follower should own its history. The
problem is that a newly promoted primary may re-assign its term to
operations which were replicated to replicas before by the previous
primary. If this happens, some operations with the same seq_no may be
assigned different terms. This is not good for the future optimistic
locking using a combination of seqno and term.
This change ensures that the primary of a follower only processes an
operation if that operation was not processed before. The skipped
operations are guaranteed to be delivered to replicas via either
primary-replica resync or peer-recovery. However, the primary must not
acknowledge until the global checkpoint is at least the highest seqno of
all skipped ops (i.e., they all have been processed on every replica).
Relates #31751
Relates #31113
Also fixed ShardFollowNodeTaskTests to not return ops when responseSize
is empty. Otherwise ops are returned when no ops are expected to be returned.
Co-authored-by: Jason Tedor <jason@tedor.me>
Unfollow should be allowed / disallowed on a per index level instead of
cluster level.
Also renamed `create_follow_index` index privilege to
`manage_follow_index` privilege and include unfollow and close APIs.
This commit modifies the follow stats API response structure to more
clearly highlight meaning of the higher level fields. In particular,
previously the response had a top-level key for each index. Instead, we
nest the indices under an "indices" field which is now an array. The
values in this array are objects containing two fields: "index" which is
the name of the follower index, and "shards" which is an array where
each value in the array is the follower stats for that shard. That is,
we have gone from:
{
"bar": [
{
"shard_id": 0...
}...
]...
}
to
{
"indices": [
{
"index": "bar",
"shards": [
{
"shard_id": 0...
}...
]
}...
}
In the CCR docs we want to refer to the endpoint that returns following
stats as the follow stats API. This commit renames the internal
implementation of this endpoint to reflect this usage.
The follower index shard history UUID will be fetched from the indices stats api when the shard follow task starts and will be provided with the bulk shard operation requests. The bulk shard operations api will fail if the provided history uuid is unequal to the actual history uuid.
No longer record the leader history uuid in shard follow task params, but rather use the leader history UUIDs directly from follower index's custom metadata. The resume follow api will remain to fail if leader index shard history UUIDs are missing.
Closes#33956
Since #34099, the FollowingEngine will skip an operation which was
already processed before. With that change, it should be okay to unmute
testFollowIndexAndCloseNode.
This arose when two commits were pushed at roughly the same time, both
of which compiled successfully against master, but not when taken
together. This commit fixes a reference in one of the commits that was
changed in the other commit.
This commit modifies the CCR stats endpoint for indices to be
/{index}/_ccr/stats. This makes this endpoint consistent with other
index-centric endpoints like indices stats.
The unfollow API changes a follower index into a regular index, so that it will accept write requests from clients.
For the unfollow api to work the index follow needs to be stopped and the index needs to be closed.
Closes#33931
This change introduces the indexing optimization using sequence numbers
in the FollowingEngine. This optimization uses the max_seq_no_updates
which is tracked on the primary of the leader and replicated to replicas
and followers.
Relates #33656
Prior to following an index in the follow API, check whether current
user has sufficient privileges in the leader cluster to read and
monitor the leader index.
Also check this in the create and follow API prior to creating the
follow index.
Also introduced READ_CCR cluster privilege that include the minimal
cluster level actions that are required for ccr in the leader cluster.
So a user can follow indices in a cluster, but not use the ccr admin APIs.
Closes#33553
Co-authored-by: Jason Tedor <jason@tedor.me>
The following changes were made:
* Added ElasticsearchSecurityException. For in the case the current user has insufficient privileges while an index is being followed. Prior to following ccr checks whether the current user has sufficient privileges and if not the follow api fails with an error.
* Added Index block exception. If the leader index gets closed, this exception is returned.
* Added ClusterBlockException service unavailable. In case for example the leader cluster is without elected master.
* Removed IndexNotFoundException. If the leader / follower index has been deleted, ccr will need to stop the shard follow tasks with an error.
Closes#33954
* Renamed CCR APIs
Renamed:
* `/{index}/_ccr/create_and_follow` to `/{index}/_ccr/follow`
* `/{index}/_ccr/unfollow` to `/{index}/_ccr/pause_follow`
* `/{index}/_ccr/follow` to `/{index}/_ccr/resume_follow`
Relates to #33931
always use `IndicesOptions.strictExpand()` for indices options.
The follow index may be closed and we still want to get stats from
shard follow task and the whether the provided index name matches with
follow index name is checked when locating the task itself in the ccr
stats transport action.
This commit replicates the max_seq_no_of_updates on the leading index
to the primaries of the following index via ShardFollowNodeTask. The
max_seq_of_updates is then transmitted to the replicas of the follower
via replication requests (that's BulkShardOperationsRequest).
Relates #33656
We start tracking max seq_no_of_updates on the primary in #33842. This
commit replicates that value from a primary to its replicas in replication
requests or the translog phase of peer-recovery.
With this change, we guarantee that the value of max seq_no_of_updates
on a replica when any index/delete operation is performed at least the
max_seq_no_of_updates on the primary when that operation was executed.
Relates #33656
If numWrites is between 2 and 9, we will issue an invalid range because
the from_seq_no is negative. This commit makes sure that numWrites is at
least 10, and adds an explicit test to verify invalid request ranges.
This PR is the first step to use seq_no to optimize indexing operations.
The idea is to track the max seq_no of either update or delete ops on a
primary, and transfer this information to replicas, and replicas use it
to optimize indexing plan for index operations (with assigned seq_no).
The max_seq_no_of_updates on primary is initialized once when a primary
finishes its local recovery or peer recovery in relocation or being
promoted. After that, the max_seq_no_of_updates is only advanced internally
inside an engine when processing update or delete operations.
Relates #33656
Instead of having one constructor that accepts all arguments, all parameters
should be provided via setters. Only leader and follower index are required
arguments. This makes using this class in tests and transport client easier.
The following stats are being kept track of:
1) The total number of times that auto following a leader index succeed.
2) The total number of times that auto following a leader index failed.
3) The total number of times that fetching a remote cluster state failed.
4) The most recent 256 auto follow failures per auto leader index
(e.g. create_and_follow api call fails) or cluster alias
(e.g. fetching remote cluster state fails).
Each auto follow run now produces a result that is being used to update
the stats being kept track of in AutoFollowCoordinator.
Relates to #33007
* [CCR] Do not unnecessarily wrap fetch exception in a ElasticSearch exception and
properly map fetch_exception.exception field as object.
The extra caused by level is not necessary here:
```
"fetch_exceptions": [
{
"from_seq_no": 1,
"retries": 106,
"exception": {
"type": "exception",
"reason": "[index1] IndexNotFoundException[no such index]",
"caused_by": {
"type": "index_not_found_exception",
"reason": "no such index",
"index_uuid": "_na_",
"index": "index1"
}
}
}
],
```
When a leader index is created, it may not have a mapping yet.
Currently if you follow such an index the shard follow tasks fail with
NoSuchElementException, because they expect a single mapping.
This commit fixes that, by allowing that a leader index does not yet have
a mapping.
Rather than scheduling pings to the leader index when we are caught up
to the leader, this commit introduces long polling for changes. We will
fire off a request to the leader which if we are already caught up will
enter a poll on the leader side to listen for global checkpoint
changes. These polls will timeout after a default of one minute, but can
also be specified when creating the following task. We use these time
outs as a way to keep statistics up to date, to not exaggerate time
since last fetches, and to avoid pipes being broken.
When executing CCR REST tests it is going to be expected after global
checkpoint polling goes in that shard changes tasks can still be pending
at the end of the test. One way to deal with this is to set a low
timeout on these polls, but then that means we are not executing our
REST tests with our default production settings and instead would be
using an unrealistic low timeout. Alternatively, since we expect these
tasks to be there, we can not count them against the test. That is what
this commit does.
This commit moves these REST tests (possibly temporarily) to a
sub-project of ccr. We do this (again, possibly temporarily) to keep
them within the ccr sub-project yet there are changes within 6.x that
prevent these from being in the top-level project (the cluster formation
tasks are trying to install x-pack-ccr into the
integ-test-zip). Therefore, we isolate these for now until we can
understand why there are differences between 6.x and master.
When developing ccr it is not ideal if tests are in multiple modules.
Even the classes these tests test are in the core module, it is easier
if these tests are in ccr module in order to avoid running the test task
in core module. This results in running many non ccr tests.
This way when developing ccr we can run locally:
./gradlew x-pack:plugin:core:precommit x-pack:plugin:ccr:check
before pushing to PR branches and be confident that the PR build passes,
without running x-pack:plugin:core:check task.
and if so debug log it and otherwise rethrow.
This should fix a couple of test failures where during test teardown tests
failed due to uncaught exceptions being detected.
The follow index api checks if the recorded uuid in the follow index matches
with uuid of the leader index and fails otherwise. This validation will
prevent a follow index from following an incompatible leader index.
The create_and_follow api will automatically add this custom index metadata
when it creates the follow index.
Closes#31505
For correctness we need to verify whether the history uuid of the leader
index shards never changes while that index is being followed.
* The history UUIDs are recorded as custom index metadata in the follow index.
* The follow api validates whether the current history UUIDs of the leader
index shards are the same as the recorded history UUIDs.
If not the follow api fails.
* While a follow index is following a leader index; shard follow tasks
on each shard changes api call verify whether their current history uuid
is the same as the recorded history uuid.
Relates to #30086
Co-authored-by: Nhat Nguyen <nhat.nguyen@elastic.co>
Improve failure handling of retryable errors by retrying remote calls in
a exponential backoff like manner. The delay between a retry would not be
longer than the configured max retry delay. Also retryable errors will be
retried indefinitely.
Relates to #30086
* [CCR] Delay auto follow license check
so that we're sure that there are auto follow patterns configured
Otherwise we log a warning in case someone is running with basic or gold
license and has not used the ccr feature.
This is a new index privilege that the user needs to have in the follow cluster.
This privilege is required in addition to the `manage_ccr` cluster privilege in
order to execute the create and follow api.
Closes#33555
We may use different global checkpoints to validate/normalize the range
of a change request if the global checkpoint is advanced between these
calls. If this is the case, then we generate an invalid request range.
This commit reverses the logic for CCR license checks in a few
actions. This is done so that the successful case, which tends to be a
larger block of code, does not require indentation.
We have some listeners in the CCR license tests that invoke Assert#fail
if the onSuccess method for the listener is unexpectedly invoked. This
can leave the main test thread hanging until the test suite times out
rather than failing quickly. This commit adds some latch countdowns so
that we fail quickly if these cases are hit.
In the multi-cluster-with-non-compliant-license tests, we try to write
out a java.policy to a temporary directory. However, if this temporary
directory does not already exist then writing the java.policy file will
fail. This commit ensures that the temporary directory exists before we
attempt to write the java.policy file.
This commit adds license checks for the auto-follow implementation. We
check the license on put auto-follow patterns, and then for every
coordination round we check that the local and remote clusters are
licensed for CCR. In the case of non-compliance, we skip coordination
yet continue to schedule follow-ups.
Instead of passing DirectoryService which causes yet another dependency
on Store we can just pass in a Directory since we will just call
`DirectoryService#newDirectory()` on it anyway.
This commit allows us to use different TranslogRecoveryRunner when
recovering an engine from its local translog. This change is a
prerequisite for the commit-based rollback PR.
Relates #32867
Auto Following Patterns is a cross cluster replication feature that
keeps track whether in the leader cluster indices are being created with
names that match with a specific pattern and if so automatically let
the follower cluster follow these newly created indices.
This change adds an `AutoFollowCoordinator` component that is only active
on the elected master node. Periodically this component checks the
the cluster state of remote clusters if there new leader indices that
match with configured auto follow patterns that have been defined in
`AutoFollowMetadata` custom metadata.
This change also adds two new APIs to manage auto follow patterns. A put
auto follow pattern api:
```
PUT /_ccr/_autofollow/{{remote_cluster}}
{
"leader_index_pattern": ["logs-*", ...],
"follow_index_pattern": "{{leader_index}}-copy",
"max_concurrent_read_batches": 2
... // other optional parameters
}
```
and delete auto follow pattern api:
```
DELETE /_ccr/_autofollow/{{remote_cluster_alias}}
```
The auto follow patterns are directly tied to the remote cluster aliases
configured in the follow cluster.
Relates to #33007
Co-authored-by: Jason Tedor jason@tedor.me
With features like CCR building on the CCS infrastructure, the settings
prefix search.remote makes less sense as the namespace for these remote
cluster settings than does a more general namespace like
cluster.remote. This commit replaces these settings with cluster.remote
with a fallback to the deprecated settings search.remote.
This test fails several times due to timeout when asserting the number
of docs on the following and leading indices. This change reduces
the number of docs to index and increases the timeout.
These response classes did not add any value and in that case just AcknowledgedResponse should be used.
I also changed the formatting of methods to take one line per parameter in
FollowIndexAction.java and UnfollowIndexAction.java files to make
reviewing diffs in the future easier.
This commit makes primary-replica resyncer use Lucene as the source of
history operation instead of translog if soft-deletes is enabled. With
this change, we no longer expose translog snapshot directly in IndexShard.
Relates #29530
These were broken when fetch exceptions were introduced to the status
object but equals and hash code were not updated then. This commit
addresses that.
Today we fetch the mapping from the leader and apply it as a mapping
update whenever the index metadata version on the leader changes. Yet,
the index metadata can change for many reasons other than a mapping
update (e.g., settings updates, adding an alias, or a replica being
promoted to a primary among many other reasons). This commit builds on
the addition of a mapping version to the index metadata to only fetch
mapping updates when the mapping version increases. This reduces the
number of these fetches and application of mappings on the follower to
the bare minimum.
* master:
Adjust BWC version on mapping version
Token API supports the client_credentials grant (#33106)
Build: forked compiler max memory matches jvmArgs (#33138)
Introduce mapping version to index metadata (#33147)
SQL: Enable aggregations to create a separate bucket for missing values (#32832)
Fix grammar in contributing docs
SECURITY: Fix Compile Error in ReservedRealmTests (#33166)
APM server monitoring (#32515)
Support only string `format` in date, root object & date range (#28117)
[Rollup] Move toBuilders() methods out of rollup config objects (#32585)
Fix forbiddenapis on java 11 (#33116)
Apply publishing to genreate pom (#33094)
Have circuit breaker succeed on unknown mem usage
Do not lose default mapper on metadata updates (#33153)
Fix a mappings update test (#33146)
Reload Secure Settings REST specs & docs (#32990)
Refactor CachingUsernamePassword realm (#32646)
This commit adds tracking and reporting for fetch exceptions. We track
fetch exceptions per fetch, keeping track of up to the maximum number of
concurrent fetches. With each failing fetch, we associate the from
sequence number with the exception that caused the fetch. We report
these in the CCR stats endpoint, and add some testing for this tracking.
Welp, I broke this. I merged a change to auto-discover the CCR QA tests
by making :x-pack:plugin:ccr:check auto-discover the check tasks in the
qa sub-project. Yet, the check tasks for these sub-projects did not
depend on the necessary test tasks (as we were previously doing this
directly from the ccr build file. This commit fixes this!
Today we are by-hand maintaining a list of CCR QA sub-projects that the
check task depends on. This commit simplifies this by finding these
sub-projects automatically and adding their check task as dependencies
of the CCR check task.
This commit implements licensing for CCR. CCR will require a platinum
license, and administrative endpoints will be disabled when a license is
non-compliant.
If a leader index is deleted while there is an active follower, the
follower will send shard changes requests bound for the leader
index. Today this will result in a null pointer exception because there
will not be an index routing table for the index. A null pointer
exception looks like a bug to a user so this commit addresses this by
throwing an index not found exception instead.
For a new feature like CCR we will go without this extra layer of
indirection. This commit replaces all /_xpack/ccr/_(\S+) endpoints by
/_ccr/$1 endpoints.
Today ShardFollowNodeTask might fetch some operations more than once.
This happens because we ask the leading for up to max_batch_count
operations (instead of the left-over size) for the left-over request.
The leading then can freely respond up to the max_batch_count, and at
the same time, if one of the previous requests completed, we might issue
another read request whose range overlaps with the response of the
left-over request.
Closes#32453
Today we do not check if the `following_index` setting of the follower
is enabled or not when processing a follow-request. If that setting is
disabled, the follower will use the default engine, not the following
engine. This change checks and rejects such invalid follow requests.
Relates #30086
Today it's possible to encounter an Index operation in Lucene whose
_source is disabled, and _recovery_source was pruned by the MergePolicy.
If it's the case, we create a Translog#Index without source and let the
caller validate it later. However, this approach is challenging for the
caller.
Deletes and No-Ops don't allow invoking "source()" method. The caller
has to make sure to call "source()" only on index operations. The
current implementation in CCR does not follow this and fail to replica
deletes or no-ops. Moreover, it's easier to reason if a Translog#Index
always has the source.
Today we consider a read request is exhausted if from_seqno is equal to
or greater than the max_required_seqno. However, if we stop when
from_seqno equals to the max_required_seqno, we will miss an operation
whose seqno is max_required_seqno because we have not seen that
operation yet.
We modified the way we calculate to_seqno in #32121 but did not adjust
this test accordingly. If min_seqno equals to max_seqno, the size should be
one instead of zero.
Relates #32121
Normally translog operations will not be replayed on the primary.
Following engine is an exception where we replay translog on both
primary and replica as a non-primary strategy. Even though we won't use
the version_type in the following engine, we still need to pass a valid
value for the primary operation in order not to trip assertions in an
engine.
This commit passes version_type EXTERNAL for translog operation if its
origin is primary.
Relates #31945
The added tests are based on specific scenarios as described in the test plan.
Before this change the ShardFollowNodeTaskTests contained more random like tests,
but these have been removed and in a followup pr better random tests will
be added in a new test class as is described in the test plan.
* master:
Painless: Simplify Naming in Lookup Package (#32177)
Handle missing values in painless (#32207)
add support for write index resolution when creating/updating documents (#31520)
ECS Task IAM profile credentials ignored in repository-s3 plugin (#31864)
Remove indication of future multi-homing support (#32187)
Rest test - allow for snapshots to take 0 milliseconds
Make x-pack-core generate a pom file
Rest HL client: Add put watch action (#32026)
Build: Remove pom generation for plugin zip files (#32180)
Fix comments causing errors with Java 11
Fix rollup on date fields that don't support epoch_millis (#31890)
Detect and prevent configuration that triggers a Gradle bug (#31912)
[test] port linux package packaging tests (#31943)
Revert "Introduce a Hashing Processor (#31087)" (#32178)
Remove empty @return from JavaDoc
Adjust SSLDriver behavior for JDK11 changes (#32145)
[test] use randomized runner in packaging tests (#32109)
Add support for field aliases. (#32172)
Painless: Fix caching bug and clean up addPainlessClass. (#32142)
Call setReferences() on custom referring tokenfilters in _analyze (#32157)
Fix BwC Tests looking for UUID Pre 6.4 (#32158)
Improve docs for search preferences (#32159)
use before instead of onOrBefore
Add more contexts to painless execute api (#30511)
Add EC2 credential test for repository-s3 (#31918)
A replica can be promoted and started in one cluster state update (#32042)
Fix Java 11 javadoc compile problem
Fix CP for namingConventions when gradle home has spaces (#31914)
Fix `range` queries on `_type` field for singe type indices (#31756)
[DOCS] Update TLS on Docker for 6.3 (#32114)
ESIndexLevelReplicationTestCase doesn't support replicated failures but it's good to know what they are
Remove versionType from translog (#31945)
Switch distribution to new style Requests (#30595)
Build: Skip jar tests if jar disabled
Painless: Add PainlessClassBuilder (#32141)
Build: Make additional test deps of check (#32015)
Disable C2 from using AVX-512 on JDK 10 (#32138)
Build: Move shadow customizations into common code (#32014)
Painless: Fix Bug with Duplicate PainlessClasses (#32110)
Remove empty @param from Javadoc
Re-disable packaging tests on suse boxes
Docs: Fix missing example script quote (#32010)
[ML] Wait for aliases in multi-node tests (#32086)
[ML] Move analyzer dependencies out of categorization config (#32123)
Ensure to release translog snapshot in primary-replica resync (#32045)
Handle TokenizerFactory TODOs (#32063)
Relax TermVectors API to work with textual fields other than TextFieldType (#31915)
Updates the build to gradle 4.9 (#32087)
Mute :qa:mixed-cluster indices.stats/10_index/Index - all’
Check that client methods match API defined in the REST spec (#31825)
Enable testing in FIPS140 JVM (#31666)
Fix put mappings java API documentation (#31955)
Add exclusion option to `keep_types` token filter (#32012)
[Test] Modify assert statement for ssl handshake (#32072)
Tests shard follow task in the context of a leader and follower ReplicationGroup,
in order to test how the shard follow logic reacts to certain shard related
failure scenarios.
More tests will need to be added, but this indicates what changes need to be made
to have these tests.
Relates to #30102
The current shard follow mechanism is complex and does not give us easy ways the have visibility into the system (e.g. why we are falling behind).
The main reason why it is complex is because the current design is highly asynchronous. Also in the current model it is hard to apply backpressure
other than reducing the concurrent reads from the leader shard.
This PR has the following changes:
* Rewrote the shard follow task to coordinate the shard follow mechanism between a leader and follow shard in a single threaded manner.
This allows for better unit testing and makes it easier to add stats.
* All write operations read from the shard changes api should be added to a buffer instead of directly sending it to the bulk shard operations api.
This allows to apply backpressure. In this PR there is a limit that controls how many write ops are allowed in the buffer after which no new reads
will be performed until the number of ops is below that limit.
* The shard changes api includes the current global checkpoint on the leader shard copy. This allows reading to be a more self sufficient process;
instead of relying on a background thread to fetch the leader shard's global checkpoint.
* Reading write operations from the leader shard (via shard changes api) is a separate step then writing the write operations (via bulk shards operations api).
Whereas before a read would immediately result into a write.
* The bulk shard operations api returns the local checkpoint on the follow primary shard, to keep the shard follow task up to date with what has been written.
* Moved the shard follow logic that was previously in ShardFollowTasksExecutor to ShardFollowNodeTask.
* Moved over the changes from #31242 to make shard follow mechanism resilient from node and shard failures.
Relates to #30086
* elastic/master: (53 commits)
Painless: Restructure/Clean Up of Spec Documentation (#31013)
Update ignore_unmapped serialization after backport
Add back dropped substitution on merge
high level REST api: cancel task (#30745)
Enable engine factory to be pluggable (#31183)
Remove vestiges of animal sniffer (#31178)
Rename elasticsearch-nio to nio (#31186)
Rename elasticsearch-core to core (#31185)
Move cli sub-project out of server to libs (#31184)
[DOCS] Fixes broken link in auditing settings
QA: Better seed nodes for rolling restart
[DOCS] Moves ML content to stack-docs
[DOCS] Clarifies recommendation for audit index output type (#31146)
Add nio-transport as option for http smoke tests (#31162)
QA: Set better node names on rolling restart tests
Add support for ignore_unmapped to geo sort (#31153)
Share common parser in some AcknowledgedResponses (#31169)
Fix random failure on SearchQueryIT#testTermExpansionExceptionOnSpanFailure
Remove reference to multiple fields with one name (#31127)
Remove BlobContainer.move() method (#31100)
...
Today if a user omits the `_source` entirely or modifies the source
on indexing we have no chance to re-create the document after it has
been added. This is an issue for CCR and recovery based on soft deletes
which we are going to make the default. This change adds an additional
recovery source if the source is disabled or modified that is only kept
around until the document leaves the retention policy window.
This change adds a merge policy that efficiently removes this extra source
on merge for all document that are live and not in the retention policy window
anymore.
The primary shard copy on the following has authority of the replication
operations that occur on the following side in cross-cluster
replication. Yet today we are using the primary term directly from the
operations on the leader side. Instead we should be replacing the
primary term on the following side with the primary term of the primary
on the following side. This commit does this by copying the translog
operations with the corrected primary term. This ensures that we use
this primary term while applying the operations on the primary, and when
replicating them across to the replica (where the replica request was
carrying the primary term of the primary shard copy on the follower).
The old perform request methods on the REST client have been deprecated
in favor using request-flavored methods. This commit addresses the use
of these deprecated methods in the CCR test suite.
Martijn van Groningen
Tim Brooks
Nhat Nguyen
Yannick Welsch
Tanguy Leroux
Christoph Büscher
David Turner
Przemyslaw Gomulka
Armin Braun
Yogesh Gaikwad
Jason Tedor
Julie Tibshirani
Henning Andersen
Alpar Torok
Dimitrios Liappis
David Roberts
Ryan Ernst
Jim Ferenczi
Luca Cavanna
Boaz Leskes
Albert Zaharovits
Andrey Ershov
Adrien Grand
Arthur Gavlyukovskiy
Nik Everett
Alexander Reelsen
David Kyle
Andrey Atapin
Simon Willnauer