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.
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
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.
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.
