The allocation decider explanation messages where improved in #21771 to
include the specific Elasticsearch setting that contributed to the
decision taken by the decider. This commit improves upon the
explanation message output by including whether the setting was an index
level setting or a cluster level setting. This will further help the
user understand and locate the setting that is the cause of shards
remaining unassigned or remaining on their current node.
Introduces `XContentParser#namedObject which works a little like
`StreamInput#readNamedWriteable`: on startup components register
parsers under names and a superclass. At runtime we look up the
parser and call it to parse the object.
Right now the parsers take a context object they use to help with
the parsing but I hope to be able to eliminate the need for this
context as most what it is used for at this point is to move
around parser registries which should be replaced by this method
eventually. I make no effort to do so in this PR because it is
big enough already. This is meant to the a start down a road that
allows us to remove classes like `QueryParseContext`,
`AggregatorParsers`, `IndicesQueriesRegistry`, and
`ParseFieldRegistry`.
The goal here is to reduce the amount of plumbing required to
allow parsing pluggable things. With this you don't have to pass
registries all over the place. Instead you must pass a super
registry to fewer places and use it to wrap the reader. This is
the same tradeoff that we use for NamedWriteable and it allows
much, much simpler binary serialization. We think we want that
same thing for xcontent serialization.
The only parsing actually converted to this method is parsing
`ScoreFunctions` inside of `FunctionScoreQuery`. I chose this
because it is relatively self contained.
ClusterStateObserver is a utility class that simplifies interacting with the cluster state in cases where an action takes a decision based on the current cluster state but may want to wait for a new state and retry upon failure. The ClusterStateObserver implements its functionality by keeping a reference to the last cluster state that it observed. When a new ClusterStateObserver is created, it samples a cluster state from the cluster service which is subsequently used for change detection. If actions take a long time to process, however, the cluster observer can reference very old cluster states. Due to cluster observers being created very frequently and cluster states being potentially large the referenced cluster states can waste a lot of heap space. A specific example where this can make a node go out of memory is given in point 2 of issue #21568: The action listener in TransportMasterNodeAction.AsyncSingleAction has a ClusterStateObserver to coordinate the retry mechanism if the action on the master node fails due to the node not being master anymore. The ClusterStateObserver in AsyncSingleAction keeps a reference to the full cluster state when the action was initiated. If the pending tasks queue grows quite large and has older items in it lots of cluster states can possibly be referenced.
This commit changes the ClusterStateObserver to hold only onto the part of the cluster state that's needed for change detection.
This changes the class from extending the abstract class to implementing the
ToXContent interface only. The former could lead to unexpected behaviour when
trying to display the object, since the "toString()" method inherited from
ToXContentToBytes would create an error message because the SuggestionBuilders
toXContent() methods don't render complete json objects.
* Internal: Refactor SettingCommand into EnvironmentAwareCommand
This change renames and changes the behavior of SettingCommand to have
its primary method take in a fully initialized Environment for
elasticsearch instead of just a map of settings. All of the subclasses
of SettingCommand already did this at some point, so this just removes
duplication.
We are currenlty checking that no deprecation warnings are emitted in our query tests. That can be moved to ESTestCase (disabled in ESIntegTestCase) as it allows us to easily catch where our tests use deprecated features and assert on the expected warnings.
We return deprecation warnings as response headers, besides logging them. Strict parsing mode stayed around, but was only used in query tests, though we also introduced checks for deprecation warnings there that don't need strict parsing anymore (see #20993).
We can then safely remove support for strict parsing mode. The final goal is to remove the ParseFieldMatcher class, but there are many many users of it. This commit prepares the field for the removal, by deprecating ParseFieldMatcher and making it effectively not needed. Strict parsing is removed from ParseFieldMatcher, and strict parsing is replaced in tests where needed with deprecation warnings checks.
Note that the setting to enable strict parsing was never ported to the new settings infra hance it cannot be set in production. It is really only used in our own tests.
Relates to #19552
Rename the method to assertToXContentEquivalent to highlight that it's tailored to ToXContent comparisons.
Rather than parsing into a map and replacing byte[] in both those maps, add custom equality assertions that recursively walk maps and lists and call Arrays.equals whenever a byte[] is encountered.
Moved field values `toXContent` logic to `GetField` (from `GetResult`), which outputs its own fields, and can also parse them now. Also added `fromXContent` to `GetResult` and `GetResponse`.
The start object and end object for `GetResponse` output have been moved to `GetResult#toXContent`, from the corresponding rest action. This makes it possible to have `toXContent` and `fromXContent` completely symmetric, as parsing requires looping till an end object is found which is weird when the corresponding `toXContent` doesn't print that out.
This also introduces the foundation for testing retrieval of _source and stored field values.
This commit makes mapping updates atomic when multiple types in an index are updated. Mappings for an index are now applied in a single atomic operation, which also allows to optimize some of the cross-type updates and checks.
Subclasses of TransportReplicationAction can currently chose to implement block levels for which the request will be blocked.
- Refresh/Flush was using the block level METADATA_WRITE although they don't operate at the cluster meta data level (but more like shard level meta data which is not represented in the block levels). Their level has been changed to null so that they can operate freely in the presence of blocks.
- GlobChkptSync was using WRITE although it does not make any changes to the actual documents of a shard. The level has been changed to null so that it can operate freely in the presence of blocks.
The commit also adds a check for closed indices in TRA so that the right exception is thrown if refresh/flush/checkpoint syncing is attempted on a closed index (before it was throwing an IndexNotFoundException, now it's throwing IndexClosedException).
Sequence BWC logic consists of two elements:
1) Wire level BWC using stream versions.
2) A changed to the global checkpoint maintenance semantics.
For the sequence number infra to work with a mixed version clusters, we have to consider situation where the primary is on an old node and replicas are on new ones (i.e., the replicas will receive operations without seq#) and also the reverse (i.e., the primary sends operations to a replica but the replica can't process the seq# and respond with local checkpoint). An new primary with an old replica is a rare because we do not allow a replica to recover from a new primary. However, it can occur if the old primary failed and a new replica was promoted or during primary relocation where the source primary is treated as a replica until the master starts the target.
1) Old Primary & New Replica - this case is easy as is taken care of by the wire level BWC. All incoming requests will have their seq# set to `UNASSIGNED_SEQ_NO`, which doesn't confuse the local checkpoint logic (keeping it at `NO_OPS_PERFORMED`)
2) New Primary & Old replica - this one is trickier as the global checkpoint service currently takes all in sync replicas into consideration for the global checkpoint calculation. In order to deal with old replicas, we change the semantics to say all *new node* in sync replicas. That means the replicas on old nodes don't count for the global checkpointing. In this state the seq# infra is not fully operational (you can't search on it, because copies may miss it) but it is maintained on shards that can support it. The old replicas will have to go through a file based recovery at some point and will get the seq# information at that point. There is still an edge case where a new primary fails and an old replica takes over. I'lll discuss this one with @ywelsch as I prefer to avoid it completely.
This PR also re-enables the BWC tests which were disabled. As such it had to fix any BWC issue that had crept in. Most notably an issue with the removal of the `timestamp` field in #21670.
The commit also includes a fix for the default value of the seq number field in replicated write requests (it was 0 but should be -2), that surface some other minor bugs which are fixed as well.
Last - I added some debugging tools like more sane node names and forcing replication request to implement a `toString`
This commit exposes public getters for the aggregations in
AggregatorFactories.Builder. The reason is that it allows to
parse the aggregation object from elsewhere (e.g. a plugin) and then
be able to get the aggregation builders in order to set them in
a SearchSourceBuilder.
The alternative would have been to expose a setter for the
AggregatorFactories.Builder object. But that would be making
the API a bit trappy.
Today if a settings object has many keys ie. if somebody specifies
a gazillion synonym in-line (arrays are keys ending with ordinals) operations like
`Settings#getByPrefix` have a linear runtime. This can cause index creations to be
very slow producing lots of garbage at the same time. Yet, `Settings#getByPrefix` is called
quite frequently by group settings etc. which can cause heavy load on the system.
While it's not recommended to have synonym lists with 25k entries in-line these use-cases should
not have such a large impact on the cluster / node. This change introduces a view-like map
that filters based on the prefixes referencing the actual source map instead of copying all values
over and over again. A benchmark that adds a single key with 25k random synonyms between 2 and 5 chars
takes 16 seconds to get the synonym prefix 200 times while the filtered view takes 4 ms for the 200 iterations.
This relates to https://discuss.elastic.co/t/200-cpu-elasticsearch-5-index-creation-very-slow-with-a-huge-synonyms-list/69052
In some cases, it might happen that the `_all` field gets a field type that is
not totally configured, and in particular lacks analyzers. This is due to the
fact that `AllFieldMapper.TypeParser.getDefault` uses `Defaults.FIELD_TYPE` as
a default field type, which does not have any analyzers configured since it
does not know about the default analyzers.
With this commit we enable the Jackson feature 'STRICT_DUPLICATE_DETECTION'
by default for all XContent types (not only JSON).
We have also changed the name of the system property to disable this feature
from `es.json.strict_duplicate_detection` to the now more appropriate name
`es.xcontent.strict_duplicate_detection`.
Relates elastic/elasticsearch#19614
Relates elastic/elasticsearch#22073
With this commit we change the data type of the 'TIMESTAMP'
meta-data field from a formatted date string to a plain
`java.util.Date` instance. The main reason for this change is
that our benchmarks have indicated that this contributes
significantly to the time spent in the ingest pipeline.
The overhead in terms of indexing throughput of the ingest
pipeline is about 15% and breaks down roughly as follows:
* 5% overhead caused by the conversion from `XContent` -> `Map`
* 5% overhead caused by the timestamp formatting
* 5% overhead caused by the conversion `Map` -> `XContent`
Relates #22074
In #22094 we introduce a test-only setting to simulate transport
impls that don't support handshakes. This commit implements the same logic
without a setting.
This commit touches addresses issues related to recovery and sequence numbers:
- A sequence number can be assigned and a Lucene commit created with a
maximum sequence number at least as large as that sequence number,
yet the operation corresponding to that sequence number can be
missing from both the Lucene commit and the translog. This means that
upon recovery the local checkpoint will be stuck at or below this
missing sequence number. To address this, we force the local
checkpoint to the maximum sequence number in the Lucene commit when
opening the engine. Note that there can still be gaps in the history
in the translog but we do not address those here.
- The global checkpoint is transferred to the target shard at the end
of peer recovery.
- Additionally, we reenable the relocation integration tests.
Lastly, this work uncovered some bugs in the assignment of sequence
numbers on replica operations:
- setting the sequence number on replica write requests was missing,
very likely introduced as a result of resolving merge conflicts
- handling operations that arrive out of order on a replica and have a
version conflict with a previous operation were never marked as
processed
Relates #22212
Some expert users like UnicastZenPing today establishes real connections to nodes during it's ping
phase that can be used by other parts of the system. Yet, this is potentially dangerous
and undesirable unless the nodes have been fully verified and should be connected to in the
case of a cluster state update or if we join a newly elected master. For use-cases like this, this change adds the infrastructure to manually handle connections that are not publicly available on the node ie. should not be managed by `Transport`/`TransportSerivce`
Some of our stats serialization code duplicates complicated seriazliation logic
or could use existing building blocks from StreamOutput/Input. This commit
cleans up some of the serialization code.
Today in the codebase we refer to seccomp everywhere instead of system
call filter even if we are not specifically referring to Linux. This
commit is a purely mechanical change to refer to system call filter
where appropriate instead of the general seccomp, and only leaves
seccomp in place when actually referring to the Linux implementation.
Relates #22243
We try to install a system call filter on various operating systems
(Linux, macOS, BSD, Solaris, and Windows) but the setting
(bootstrap.seccomp) to control this is named after the Linux
implementation (seccomp). This commit replaces this setting with
bootstrap.system_call_filter. For backwards compatibility reasons, we
fallback to bootstrap.seccomp and log a deprecation message if
bootstrap.seccomp is set. We intend to remove this fallback in
6.0.0. Note that now is the time to make this change it's likely that
most users are not making this setting anyway as prior to version 5.2.0
(currently unreleased) it was not necessary to configure anything to
enable a node to start up if the system call filter failed to install
(we marched on anyway) but starting in 5.2.0 it will be necessary in
this case.
Relates #22226
With recent changes to our parsing code we have drastically reduced the places where we auto-detect the content type from the input. The usage of these methods spread in our codebase for no reason, given that in most of the cases we know the content type upfront and we don't need any auto-detection mechanism. Deprecating these methods is a way to try and make sure that these methods are carefully used, and hopefully not introduced in newly written code.
We have yet to fix the REST layer to read the Content-Type header, which is the long term solution, but for now we just want to make sure that the usage of these methods doesn't spread any further.
Relates to #19388
In #20305, _suggest endpoint was deprecated
in favour of using _search endpoint. This
commit removes the dedicated _suggest endpoint
entirely from master.
Depending on how the connection is closed the `#onChannelClosed` callback
might be invoked more than once or the handler has been processed by the response
of the handshake already. This commit only notifies the handler if was removed from
the pending map.
Sends the `error_trace` parameter with all requests sent by the
yaml test framework, including the doc snippet tests. This can be
overridden by settings `error_trace: false`. While this drift's
core's handling of the yaml tests from the client's slightly this
should only be a problem for tests that rely on the default value,
both of which I've fixed by setting the value explicitly.
This also escapes `\n` and `\t` in the `Stash dump on failure` so
the `stack_trace` is more readable.
Also fixes `RestUpdateSettingsAction` to not think of the `error_trace`
parameter as a setting.
`ClusterService` is responsible of updating the cluster state on every node (as a response to an API call on the master and when non-masters receive a new state from the master). When a new cluster state is processed, it is made visible via the `ClusterService#state` method and is sent to series of listeners. Those listeners come in two flavours - one is to change the state of the node in response to the new cluster state (call these cluster state appliers), the other is to start a secondary process. Examples for the later include an indexing operation waiting for a shard to be started or a master node action waiting for a master to be elected.
The fact that we expose the state before applying it means that samplers of the cluster state had to worry about two things - working based on a stale CS and working based on a future, i.e., "being applied" CS. The `ClusterStateStatus` was used to allow distinguishing between the two. Working with a stale cluster state is not avoidable. How this PR changes things to make sure consumers don't need to worry about future CS, removing the need for the status and simplifying the waiting logic.
This change does come with a price as "cluster state appliers" can't sample the cluster state from `ClusterService` whenever they want as the cluster state isn't exposed yet. However, recent clean ups made this is situation easier and this PR takes the last steps to remove such sampling. This also helps clarify the "information flow" and helps component separation (and thus potential unit testing). It also adds an assertion that will trigger if the cluster state is sampled by such listeners.
Note that there are still many "appliers" that could be made a simpler, unrestricted "listener" but this can be done in smaller bits in the future. The commit also makes it clear what the `appliers` and what the `listeners` are by using dedicated interfaces.
Also, since I had to change the listener types I went ahead and changed the data structure for temporary/timeout listeners (used for the observer) so addition and removal won't be an O(n) operation.
This commit addresses an issue in the stats APIs where
include_segment_file_sizes was not being consumed leading to requests
containing this parameter being rejected.
Relates #21879
Since #22094 has been back-ported to 5.2 we can remove all BWC layers from master since all supported version will handle handshake requests.
Relates to #22094
Today sending a message on a closed channel doesn't throw an exception. The channel
might just swallow the exception and informs the internal async exception handler
that a channel got disconnected. This change adds a safety check that we fail
the handshake if we registered a handler but the channel has been closed already
for instance due to a reset by peer.
Merging mappings ensures that fields are used consistently across mapping types. Disabling norms for a specific field in one mapping type for example also disables norms for the same field in other mapping types of that index. The logic that ensures this while merging mappings currently always creates a fresh document mapper for all existing mapping types, even if no change occurred. Creating such a fresh document mapper does not come for free though as it involves recompressing the source. Making a mapping change to one type of an index with 100 types will thus re-serialize and recompress all 100 types, independent of any changes made to those types.
This commit fixes the update logic to only create a new DocumentMapper if a field type actually changes.
2. remove Created by declaration
3. fix typo method name from testExceptionForCopyToInMultiFields to testExceptionForIncludeInAllInMultiFields
4. fix typo method name from createMappinmgWithIncludeInAllInMultiField to createMappingWithIncludeInAllInMultiField
5. use expectThrows rather than try catch according to nik9000's comments
Tal Levy
Ali Beyad
Nik Everett
Yannick Welsch
Christoph Büscher
Tanguy Leroux
Ryan Ernst
Alexander Lin
Grzegorz Gajos
javanna
Luca Cavanna
Boaz Leskes
Dimitris Athanasiou
Simon Willnauer
Adrien Grand
Daniel Mitterdorfer
Jason Tedor
Areek Zillur
Masaru Hasegawa
Simon Willnauer
Aaron Spiegel
Jim Ferenczi
makeyang