Avoid sending duplicate remote failed shard requests #31313

dnhatn · 2018-06-14T01:59:44Z

Today if a write replication request fails, we will send a shard-failed message to the master node to fail that replica. However, if there are many ongoing write replication requests and the master node is busy, we might overwhelm the cluster and the master node with many shard-failed requests.

This commit tries to minimize the shard-failed requests in the above scenario by caching the ongoing shard-failed requests.

This issue was discussed at https://discuss.elastic.co/t/half-dead-node-lead-to-cluster-hang/113658/25.

We might lose messages between getCapturedRequestsAndClear calls. This commit makes sure that both getCapturedRequestsAndClear and getCapturedRequestsByTargetNodeAndClear are atomic.

Today if a replica fails, we will send a shard failed request for each replication request to the master node until that primary receives the new cluster state. However, if a bulk requests are large and the master node is busy, we might overwhelm the cluster with shard failed requests. This commit tries to minimize the shard failed requests in the above scenario by caching the ongoing requests. This was discussed at https://discuss.elastic.co/t/half-dead-node-lead-to-cluster-hang/113658/25

elasticmachine · 2018-06-14T01:59:45Z

Pinging @elastic/es-distributed

dnhatn · 2018-06-14T02:00:01Z

I will make another PR for local shard-failed requests and #15896.

dnhatn · 2018-06-14T02:01:43Z

test/framework/src/main/java/org/elasticsearch/test/transport/CapturingTransport.java

+        return requests.toArray(new CapturedRequest[0]);
+    }
+
+    private Map<String, List<CapturedRequest>> groupRequestsByTargetNode(Collection<CapturedRequest> requests) {


I opened #31312 for CapturingTransport .

ywelsch

Thanks @dnhatn. I've left 2 questions. I'm also wondering why you chose to do the local failures in a later PR? Can't we just reuse the same failedShardsCache?

ywelsch · 2018-06-14T07:52:13Z

server/src/main/java/org/elasticsearch/cluster/action/shard/ShardStateAction.java

+                }
+            }
+            if (firstException != null) {
+                throw new ElasticsearchException("failed to notify listener", firstException);


where is this exception going to end up?

It's an interesting question. It will be reported as unhandled by the transport threads. The same thing should happen for the current implementation.

ywelsch · 2018-06-14T07:56:34Z

...st/java/org/elasticsearch/cluster/action/shard/ShardFailedClusterStateTaskExecutorTests.java

-        Map<FailedShardEntry, ClusterStateTaskExecutor.TaskResult> taskResultMap =
-            failingTasks.stream().collect(Collectors.toMap(Function.identity(), task -> ClusterStateTaskExecutor.TaskResult.failure(new RuntimeException("simulated applyFailedShards failure"))));
-        taskResultMap.putAll(nonExistentTasks.stream().collect(Collectors.toMap(Function.identity(), task -> ClusterStateTaskExecutor.TaskResult.success())));
+        Map<FailedShardEntry, ClusterStateTaskExecutor.TaskResult> taskResultMap = new IdentityHashMap<>();


what's the reason for turning this into a identity map?

Previously we did not override FailedShardEntry, but now we do. I used an identity map because we verify that the size of the resultMap equals the number of tasks.

I replaced these maps with a list. I think it's clearer now.

bleskes

Concept looks good to me, especially where the intention is do share this with IndicesClusterStateService.

dnhatn · 2018-06-14T14:13:50Z

@ywelsch @bleskes Thanks for looking at this.

I'm also wondering why you chose to do the local failures in a later PR? Can't we just reuse the same failedShardsCache?

I did a prototype for both and realized that we might have to use two separate maps: one for local shard failed requests; one for remote shard failed requests. I prefer to do the remote first because it's tidy so that we can see the concept better.

This reverts commit 99562c0.

dnhatn · 2018-06-15T02:52:51Z

@elasticmachine test this please

ywelsch

LGTM

ywelsch · 2018-06-18T14:57:27Z

...st/java/org/elasticsearch/cluster/action/shard/ShardFailedClusterStateTaskExecutorTests.java

-        Map<FailedShardEntry, ClusterStateTaskExecutor.TaskResult> taskResultMap =
-            failingTasks.stream().collect(Collectors.toMap(Function.identity(), task -> ClusterStateTaskExecutor.TaskResult.failure(new RuntimeException("simulated applyFailedShards failure"))));
-        taskResultMap.putAll(nonExistentTasks.stream().collect(Collectors.toMap(Function.identity(), task -> ClusterStateTaskExecutor.TaskResult.success())));
+        List<Tuple<FailedShardEntry, ClusterStateTaskExecutor.TaskResult>> taskResultMap = new ArrayList<>();


rename to taskResultList?

ywelsch · 2018-06-18T14:57:46Z

...st/java/org/elasticsearch/cluster/action/shard/ShardFailedClusterStateTaskExecutorTests.java

-                task -> ClusterStateTaskExecutor.TaskResult.failure(new ShardStateAction.NoLongerPrimaryShardException(task.shardId,
-                    "primary term [" + task.primaryTerm + "] did not match current primary term [" +
-                        currentState.metaData().index(task.shardId.getIndex()).primaryTerm(task.shardId.id()) + "]"))));
+        List<Tuple<FailedShardEntry, ClusterStateTaskExecutor.TaskResult>> taskResultMap = tasks.stream()


same here (taskResultList)

ywelsch · 2018-06-18T14:59:20Z

server/src/test/java/org/elasticsearch/cluster/action/shard/ShardStateActionTests.java

+        CountDownLatch latch = new CountDownLatch(numListeners);
+        for (int i = 0; i < numListeners; i++) {
+            shardStateAction.remoteShardFailed(failedShard.shardId(), failedShard.allocationId().getId(),
+                primaryTerm + 1, markAsStale, "test", getSimulatedFailure(), new ShardStateAction.Listener() {


why primaryTerm + 1? just a random but fixed value would do? (we never run this task)

I pushed 496a6bd. I copied this from an existing test.

dnhatn · 2018-06-18T19:03:54Z

Thanks @ywelsch and @bleskes for reviewing!

* master: Add get stored script and delete stored script to high level REST API - post backport fix Add get stored script and delete stored script to high level REST API (#31355) Core: Combine Action and GenericAction (#31405) Fix reference to XContentBuilder.string() (#31337) Avoid sending duplicate remote failed shard requests (#31313) Fix defaults in GeoShapeFieldMapper output (#31302) RestAPI: Reject forcemerge requests with a body (#30792) Packaging: Remove windows bin files from the tar distribution (#30596) Docs: Use the default distribution to test docs (#31251) [DOCS] Adds testing for security APIs (#31345) Clarify that IP range data can be specified in CIDR notation. (#31374) Use system context for cluster state update tasks (#31241) Percentile/Ranks should return null instead of NaN when empty (#30460) REST high-level client: add validate query API (#31077) Move language analyzers from server to analysis-common module. (#31300) [Test] Fix :example-plugins:rest-handler on Windows Expose lucene's RemoveDuplicatesTokenFilter (#31275) Reload secure settings for plugins (#31383) Remove some cases in FieldTypeLookupTests that are no longer relevant. (#31381) Ensure we don't use a remote profile if cluster name matches (#31331) [TEST] Double write alias fault (#30942) [DOCS] Fix version in SQL JDBC Maven template [DOCS] Improve install and setup section for SQL JDBC SQL: Fix rest endpoint names in node stats (#31371) Support for remote path in reindex api - post backport fix Closes #22913 [ML] Put ML filter API response should contain the filter (#31362) Support for remote path in reindex api (#31290) Add byte array pooling to nio http transport (#31349) Remove trial status info from start trial doc (#31365) [DOCS] Adds links to release notes and highlights add is-write-index flag to aliases (#30942) Add rollover-creation-date setting to rolled over index (#31144) [ML] Hold ML filter items in sorted set (#31338) [Tests] Fix edge case in ScriptedMetricAggregatorTests (#31357)

Today if a write replication request fails, we will send a shard-failed message to the master node to fail that replica. However, if there are many ongoing write replication requests and the master node is busy, we might overwhelm the cluster and the master node with many shard-failed requests. This commit tries to minimize the shard-failed requests in the above scenario by caching the ongoing shard-failed requests. This issue was discussed at https://discuss.elastic.co/t/half-dead-node-lead-to-cluster-hang/113658/25.

* 6.x: Avoid sending duplicate remote failed shard requests (#31313) Add get field mappings to High Level REST API Client Relates to #27205 [DOCS] Updates Watcher examples for code testing (#31152) [DOCS] Move monitoring to docs folder (#31477) [DOCS] Fixes SQL docs in nav [DOCS] Move sql to docs IndexShard should not return null stats - empty stats or AlreadyCloseException if it's closed is better Clarify that IP range data can be specified in CIDR notation. (#31374) Remove some cases in FieldTypeLookupTests that are no longer relevant. (#31381) In NumberFieldType equals and hashCode, make sure that NumberType is taken into account. (#31514) fix repository update with the same settings but different type Revert "AwaitsFix FullClusterRestartIT#testRecovery" Upgrade to Lucene 7.4.0. (#31529) Avoid deprecation warning when running the ML datafeed extractor. (#31463) Retry synced-flush in FullClusterRestartIT#testRecovery Allow multiple unicast host providers (#31509) [ML] Add ML filter update API (#31437) AwaitsFix FullClusterRestartIT#testRecovery Fix missing historyUUID in peer recovery when rolling upgrade 5.x to 6.3 (#31506) Remove QueryCachingPolicy#ALWAYS_CACHE (#31451) Rename createNewTranslog to fileBasedRecovery (#31508) [DOCS] Add code snippet testing in more ML APIs (#31339) [DOCS] Remove fixed file from build.gradle [DOCS] Creates field and document level security overview (#30937) Test: Skip assertion on windows [DOCS] Move migration APIs to docs (#31473) Add a known issue for upgrading from 5.x to 6.3.0 (#31501) Return transport addresses from UnicastHostsProvider (#31426) Add Delete Snapshot High Level REST API Reload secure settings for plugins (#31481) [DOCS] Fix JDBC Maven client group/artifact ID

liaoyanyunde · 2019-07-03T01:43:48Z

unit testcase “testRemoteShardFailedConcurrently” in ShardStateActionTests always excute faild。

hackerwin7 · 2019-12-01T03:12:41Z

I will make another PR for local shard-failed requests and #15896.

Where is the PR for local shard failed duplicate requests? @dnhatn

dnhatn · 2019-12-01T16:05:30Z

Hi @hackerwin7, did you hit any issue relating to this PR?

hackerwin7 · 2019-12-02T02:55:39Z

Hi @hackerwin7, did you hit any issue relating to this PR?

@dnhatn

Yes, in 6.3.1 (before 6.4.0), we hit the pending task flooded. after reviewing this PR, it seems that there is only remote shard failed deduplicate, and you say another PR for local shard failed, so where is it?

dnhatn · 2019-12-02T14:59:51Z

@hackerwin7 I haven't implemented that PR yet because of other higher priority tasks. As you are on 6.3.1, I think you have hit the remote shard failed tasks, not the local shard failed tasks. You should upgrade to a newer version to have this fix. Can you continue this discussion in the forums? This allows us to use GitHub for verified bug reports, feature requests, and pull requests. Thank you.

hackerwin7 · 2019-12-03T06:41:54Z

@hackerwin7 I haven't implemented that PR yet because of other higher priority tasks. As you are on 6.3.1, I think you have hit the remote shard failed tasks, not the local shard failed tasks. You should upgrade to a newer version to have this fix. Can you continue this discussion in the forums? This allows us to use GitHub for verified bug reports, feature requests, and pull requests. Thank you.

@dnhatn
I create a discuss on forums

dnhatn added 2 commits June 13, 2018 21:25

TEST: getCapturedRequestsAndClear should be atomic

99562c0

We might lose messages between getCapturedRequestsAndClear calls. This commit makes sure that both getCapturedRequestsAndClear and getCapturedRequestsByTargetNodeAndClear are atomic.

dnhatn added v7.0.0 :Distributed Indexing/Distributed A catch all label for anything in the Distributed Area. Please avoid if you can. v6.4.0 labels Jun 14, 2018

dnhatn requested review from bleskes and ywelsch June 14, 2018 01:59

dnhatn added the >enhancement label Jun 14, 2018

dnhatn commented Jun 14, 2018

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ywelsch reviewed Jun 14, 2018

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bleskes reviewed Jun 14, 2018

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dnhatn added 3 commits June 14, 2018 09:24

Merge branch 'master' into cache-remote-shards-failed

71a2db4

Simplify report

6a704c7

Remove identity map

7601a13

dnhatn added 2 commits June 14, 2018 21:39

Revert "TEST: getCapturedRequestsAndClear should be atomic"

19baf31

This reverts commit 99562c0.

Merge branch 'master' into cache-remote-shards-failed

dcdaba7

ywelsch approved these changes Jun 18, 2018

View reviewed changes

dnhatn added 3 commits June 18, 2018 12:45

Address Yannick’s comments

a102531

Merge branch 'master' into cache-remote-shards-failed

56da910

Randomize primary term

496a6bd

dnhatn merged commit 2a8381d into elastic:master Jun 18, 2018

dnhatn deleted the cache-remote-shards-failed branch June 18, 2018 19:05

dnhatn added the backport pending label Jun 18, 2018

dnhatn removed the backport pending label Jun 23, 2018

colings86 added v7.0.0-beta1 and removed v7.0.0 labels Feb 7, 2019

ywelsch mentioned this pull request Apr 23, 2019

Improve TaskBatcher performance in case of a datacenter failure #41406

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Bukhtawar mentioned this pull request Jul 21, 2019

Optimize logging pending task summary #44658

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DaveCTurner mentioned this pull request Jan 4, 2022

Shard state transitions should be edge-triggered rather than level-triggered #82185

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haveTryTwo mentioned this pull request Jul 16, 2023

Avoid sending duplicate remote failed shard requests haveTryTwo/elasticsearch-6.3.2#13

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Avoid sending duplicate remote failed shard requests #31313

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