Fix flaky SegmentReplicationITs. #6015

mch2 · 2023-01-25T23:01:01Z

Signed-off-by: Marc Handalian [email protected]

Description

This change fixes flakiness with segment replication ITs. It does this by updating the wait condition used to ensure replicas are up to date to wait until a searched docCount is reached instead of output of the Segments API that can change if there are concurrent refreshes.
It also does this by updating the method used to assert segment stats to wait until the assertion holds true rather than at a point in time. This method is also updated to assert store metadata directly over API output. In doing so I've moved the method used to compute store metadata on top of IndexShard.

I've run this about ~1k times on the file locally and not seeing any issues, will open this and run a few times to test from CI.

Issues Resolved

#5669 - note not all tests in this issue will be resolved with this change, only those with doc count mismatches, particularly testReplicationAfterPrimaryRefreshAndFlush.

Check List

New functionality includes testing.
- All tests pass
New functionality has been documented.
- New functionality has javadoc added
Commits are signed per the DCO using --signoff
Commit changes are listed out in CHANGELOG.md file (See: Changelog)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

This change fixes flakiness with segment replication ITs. It does this by updating the wait condition used to ensure replicas are up to date to wait until a searched docCount is reached instead of output of the Segments API that can change if there are concurrent refreshes. It also does this by updating the method used to assert segment stats to wait until the assertion holds true rather than at a point in time. This method is also updated to assert store metadata directly over API output. Signed-off-by: Marc Handalian <[email protected]>

github-actions · 2023-01-26T00:34:20Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      1 org.opensearch.indices.replication.SegmentReplicationIT.testDropPrimaryDuringReplication
      1 org.opensearch.cluster.routing.allocation.decider.DiskThresholdDeciderIT.testIndexCreateBlockWithAReadOnlyBlock
      1 org.opensearch.cluster.routing.allocation.decider.DiskThresholdDeciderIT.testIndexCreateBlockIsRemovedWhenAnyNodesNotExceedHighWatermark

URL: https://build.ci.opensearch.org/job/gradle-check/9937/
CommitID: 030a6e1
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

codecov-commenter · 2023-01-26T00:36:26Z

Codecov Report

Merging #6015 (66f9042) into main (f9eb9bf) will increase coverage by 0.56%.
The diff coverage is 100.00%.

📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

@@             Coverage Diff              @@
##               main    #6015      +/-   ##
============================================
+ Coverage     70.73%   71.30%   +0.56%     
- Complexity    58738    59132     +394     
============================================
  Files          4771     4771              
  Lines        280820   280818       -2     
  Branches      40568    40568              
============================================
+ Hits         198645   200243    +1598     
+ Misses        65865    64461    -1404     
+ Partials      16310    16114     -196

Impacted Files	Coverage Δ
...in/java/org/opensearch/index/shard/IndexShard.java	`70.62% <100.00%> (+0.62%)`	⬆️
.../indices/replication/SegmentReplicationTarget.java	`92.92% <100.00%> (+1.66%)`	⬆️
...n/java/org/opensearch/test/rest/yaml/Features.java	`60.00% <0.00%> (-20.00%)`	⬇️
...org/opensearch/index/query/ExistsQueryBuilder.java	`74.19% <0.00%> (-19.36%)`	⬇️
...min/indices/stats/TransportIndicesStatsAction.java	`73.91% <0.00%> (-17.40%)`	⬇️
...r/src/main/java/org/opensearch/http/HttpUtils.java	`50.00% <0.00%> (-16.67%)`	⬇️
.../node/tasks/cancel/TransportCancelTasksAction.java	`66.66% <0.00%> (-16.67%)`	⬇️
...ons/bucket/composite/PointsSortedDocsProducer.java	`76.00% <0.00%> (-12.00%)`	⬇️
...uster/repositories/get/GetRepositoriesRequest.java	`33.33% <0.00%> (-11.12%)`	⬇️
...n/java/org/opensearch/action/bulk/BulkRequest.java	`74.38% <0.00%> (-10.75%)`	⬇️
... and 486 more

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mch2 · 2023-01-26T00:57:43Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕

TEST FAILURES:
      1 org.opensearch.indices.replication.SegmentReplicationIT.testDropPrimaryDuringReplication
      1 org.opensearch.cluster.routing.allocation.decider.DiskThresholdDeciderIT.testIndexCreateBlockWithAReadOnlyBlock
      1 org.opensearch.cluster.routing.allocation.decider.DiskThresholdDeciderIT.testIndexCreateBlockIsRemovedWhenAnyNodesNotExceedHighWatermark
URL: https://build.ci.opensearch.org/job/gradle-check/9937/

CommitID: 030a6e1
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

org.opensearch.indices.replication.SegmentReplicationIT.testDropPrimaryDuringReplication grr.. looking at this one...

Signed-off-by: Marc Handalian <[email protected]>

github-actions · 2023-01-26T07:05:32Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      1 org.opensearch.index.ShardIndexingPressureIT.testShardIndexingPressureTrackingDuringBulkWrites
      1 org.opensearch.cluster.routing.allocation.decider.DiskThresholdDeciderIT.testIndexCreateBlockWhenAllNodesExceededHighWatermark
      1 org.opensearch.cluster.routing.allocation.decider.DiskThresholdDeciderIT.testIndexCreateBlockIsRemovedWhenAnyNodesNotExceedHighWatermark

URL: https://build.ci.opensearch.org/job/gradle-check/9947/
CommitID: 66f9042
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

github-actions · 2023-01-26T08:22:26Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      1 org.opensearch.cluster.routing.allocation.decider.DiskThresholdDeciderIT.testIndexCreateBlockIsRemovedWhenAnyNodesNotExceedHighWatermark

URL: https://build.ci.opensearch.org/job/gradle-check/9948/
CommitID: 66f9042
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

github-actions · 2023-01-26T17:07:36Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      1 org.opensearch.cluster.routing.allocation.decider.DiskThresholdDeciderIT.testIndexCreateBlockWithAReadOnlyBlock
      1 org.opensearch.cluster.routing.allocation.decider.DiskThresholdDeciderIT.testIndexCreateBlockIsRemovedWhenAnyNodesNotExceedHighWatermark

URL: https://build.ci.opensearch.org/job/gradle-check/9956/
CommitID: 66f9042
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

mch2 · 2023-01-26T17:09:35Z

last few runs related to DiskThresholdDeciderIT failures. #5956

I've run SR test testDropPrimaryDuringReplication overnight 1,150 times locally while running the entire test class and not able to repro this. Will try some more today. In the meantime improved the error msg and kicking off a few more check runs on this PR.

github-actions · 2023-01-26T18:19:45Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      1 org.opensearch.snapshots.DedicatedClusterSnapshotRestoreIT.testIndexDeletionDuringSnapshotCreationInQueue

URL: https://build.ci.opensearch.org/job/gradle-check/9967/
CommitID: 66f9042
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

dreamer-89 · 2023-01-26T19:05:07Z

server/src/main/java/org/opensearch/indices/replication/SegmentReplicationTarget.java

-        final Store.RecoveryDiff diff = Store.segmentReplicationDiff(checkpointInfo.getMetadataMap(), getMetadataMap());
-        logger.trace("Replication diff {}", diff);
+        final Store.RecoveryDiff diff = Store.segmentReplicationDiff(checkpointInfo.getMetadataMap(), indexShard.getSegmentMetadataMap());
+        logger.trace("Replication diff for checkpoint {} {}", checkpointInfo.getCheckpoint(), diff);


Thanks for doing this.

dreamer-89 · 2023-01-26T19:17:35Z

...er/src/internalClusterTest/java/org/opensearch/indices/replication/SegmentReplicationIT.java

+        final ShardRouting replicaShardRouting = shardSegments.getShardRouting();
+        ClusterState state = client(internalCluster().getClusterManagerName()).admin().cluster().prepareState().get().getState();
+        final DiscoveryNode replicaNode = state.nodes().resolveNode(replicaShardRouting.currentNodeId());
+        return getIndexShard(replicaNode.getName());


How about ?
return getIndexShard(shardSegments.getShardRouting().currentNodeId()) ;

This may not be needed based on #6015 (comment)

dreamer-89 · 2023-01-26T19:31:26Z

...er/src/internalClusterTest/java/org/opensearch/indices/replication/SegmentReplicationIT.java

+        assertBusy(() -> {
+            final IndicesSegmentResponse indicesSegmentResponse = client().admin()
+                .indices()
+                .segments(new IndicesSegmentsRequest())
+                .actionGet();
+            List<ShardSegments[]> segmentsByIndex = getShardSegments(indicesSegmentResponse);

-                // Fetch the IndexShard for this replica and try and build its SegmentInfos from the previous commit point.
-                // This ensures the previous commit point is not wiped.
-                final ShardRouting replicaShardRouting = shardSegment.getShardRouting();
-                ClusterState state = client(internalCluster().getMasterName()).admin().cluster().prepareState().get().getState();
-                final DiscoveryNode replicaNode = state.nodes().resolveNode(replicaShardRouting.currentNodeId());
-                IndexShard indexShard = getIndexShard(replicaNode.getName());
-                // calls to readCommit will fail if a valid commit point and all its segments are not in the store.
-                indexShard.store().readLastCommittedSegmentsInfo();
+            // There will be an entry in the list for each index.
+            assertEquals("Expected a different number of shards in the index", numberOfShards, segmentsByIndex.size());
+            for (ShardSegments[] replicationGroupSegments : segmentsByIndex) {
+                // Separate Primary & replica shards ShardSegments.
+                final Map<Boolean, List<ShardSegments>> segmentListMap = segmentsByShardType(replicationGroupSegments);
+                final List<ShardSegments> primaryShardSegmentsList = segmentListMap.get(true);
+                final List<ShardSegments> replicaShardSegmentsList = segmentListMap.get(false);
+                assertEquals("There should only be one primary in the replicationGroup", 1, primaryShardSegmentsList.size());
+                assertEquals(
+                    "There should be a ShardSegment entry for each replica in the replicationGroup",
+                    numberOfReplicas,
+                    replicaShardSegmentsList.size()
+                );
+                final ShardSegments primaryShardSegments = primaryShardSegmentsList.stream().findFirst().get();
+                final IndexShard primaryShard = getIndexShard(primaryShardSegments);
+                final Map<String, StoreFileMetadata> primarySegmentMetadata = primaryShard.getSegmentMetadataMap();
+                for (ShardSegments replicaShardSegments : replicaShardSegmentsList) {
+                    final IndexShard replicaShard = getIndexShard(replicaShardSegments);


I don't see usage of List<ShardSegments[]> segmentsByIndex other than finding primary/replica set corresponding to an index and then verify store content. Finding this little complicated and feel can be simplified by iterating over routing table. With this, below two methods can be removed.

private IndexShard getIndexShard(ShardSegments shardSegments).

private Map<Boolean, List<ShardSegments>> segmentsByShardType(ShardSegments[] replicationGroupSegments)

for(IndexRoutingTable indexRoutingTable: clusterState.routingTable()) { for(IndexShardRoutingTable shardRoutingTable: indexRoutingTable) { final ShardRouting primaryRouting = shardRoutingTable.primaryShard(); final String indexName = primaryRouting.getIndexName(); final List<ShardRouting> replicaRouting = shardRoutingTable.replicaShards(); final IndexShard primaryShard = getIndexShard(shardRoutingTable.primaryShard().currentNodeId(), indexName); for(ShardRouting replica: replicaRouting) { IndexShard replicaShard = getIndexShard(replica.currentNodeId(), indexName); // Compare store content } } }

you're right, there's really no reason to use the Segments API anymore only for the node Ids. Will update.

dreamer-89 · 2023-01-26T20:01:02Z

...er/src/internalClusterTest/java/org/opensearch/indices/replication/SegmentReplicationIT.java

    }

    public void testDropPrimaryDuringReplication() throws Exception {
+        int replica_count = 6;


dreamer-89 · 2023-01-26T20:09:54Z

...er/src/internalClusterTest/java/org/opensearch/indices/replication/SegmentReplicationIT.java

-                    assertEquals(replicaSegment.getDeletedDocs(), primarySegment.getDeletedDocs());
-                    assertEquals(replicaSegment.getSize(), primarySegment.getSize());
-                }
+    private void assertIdenticalSegments(int numberOfShards, int numberOfReplicas) throws Exception {


nit: assertIdenticalSegments -> verifyStoreContent echoes better with method definition.

Signed-off-by: Marc Handalian <[email protected]>

dreamer-89 · 2023-01-27T00:57:18Z

Precommit failure due to spotless check

* What went wrong:
Execution failed for task ':server:spotlessJavaCheck'.
> The following files had format violations:
      src/internalClusterTest/java/org/opensearch/indices/replication/SegmentReplicationIT.java
          @@ -210,7 +210,7 @@
           ·····*·<p>
1066 actionable tasks: 1065 executed, 1 from cache
           ·····*·TODO:·Ignoring·this·test·as·its·flaky·and·needs·separate·fix
           ·····*/
          -·····@AwaitsFix(bugUrl·=·"https://github.com/opensearch-project/OpenSearch/issues/5669")
          +····@AwaitsFix(bugUrl·=·"https://github.com/opensearch-project/OpenSearch/issues/5669")
           ····public·void·testAddNewReplicaFailure()·throws·Exception·{
           ········logger.info("-->·starting·[Primary·Node]·...");
           ········final·String·primaryNode·=·internalCluster().startNode();
  Run './gradlew :server:spotlessApply' to fix these violations.

Signed-off-by: Marc Handalian <[email protected]>

github-actions · 2023-01-27T01:01:41Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      1 org.opensearch.indices.replication.SegmentReplicationIT.testAddNewReplicaFailure
      1 org.opensearch.cluster.routing.allocation.decider.DiskThresholdDeciderIT.testIndexCreateBlockWithAReadOnlyBlock
      1 org.opensearch.cluster.routing.allocation.decider.DiskThresholdDeciderIT.testIndexCreateBlockWhenAllNodesExceededHighWatermark

URL: https://build.ci.opensearch.org/job/gradle-check/10003/
CommitID: 16a476d
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

github-actions · 2023-01-27T01:03:08Z

Gradle Check (Jenkins) Run Completed with:

RESULT: FAILURE ❌
URL: https://build.ci.opensearch.org/job/gradle-check/10004/
CommitID: 04676e7
Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
Is the failure a flaky test unrelated to your change?

dreamer-89

LGTM! Thank you @mch2 for making this change.

github-actions · 2023-01-27T01:25:25Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      1 org.opensearch.index.IndexServiceTests.testAsyncTranslogTrimTaskOnClosedIndex
      1 org.opensearch.cluster.routing.allocation.decider.DiskThresholdDeciderIT.testIndexCreateBlockWithAReadOnlyBlock
      1 org.opensearch.cluster.routing.allocation.decider.DiskThresholdDeciderIT.testIndexCreateBlockWhenAllNodesExceededHighWatermark
      1 org.opensearch.cluster.allocation.AwarenessAllocationIT.testThreeZoneOneReplicaWithForceZoneValueAndLoadAwareness

URL: https://build.ci.opensearch.org/job/gradle-check/10005/
CommitID: 555492f
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

mch2 · 2023-01-27T01:36:25Z

  1 org.opensearch.indices.replication.SegmentReplicationIT.testAddNewReplicaFailure

This flaky failure was because I pushed an unintentional commit to unMute this test. This test is not fixed as part of this PR and remains muted in further commits.

* Fix flaky SegmentReplicationITs. This change fixes flakiness with segment replication ITs. It does this by updating the wait condition used to ensure replicas are up to date to wait until a searched docCount is reached instead of output of the Segments API that can change if there are concurrent refreshes. It also does this by updating the method used to assert segment stats to wait until the assertion holds true rather than at a point in time. This method is also updated to assert store metadata directly over API output. Signed-off-by: Marc Handalian <[email protected]> * Fix error message to print expected and actual doc counts. Signed-off-by: Marc Handalian <[email protected]> * PR feedback. Signed-off-by: Marc Handalian <[email protected]> * spotless. Signed-off-by: Marc Handalian <[email protected]> Signed-off-by: Marc Handalian <[email protected]> (cherry picked from commit ade01ec) Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

dreamer-89 · 2023-01-27T22:50:10Z

Backporting this to 2.x, without this all changes on tests will cause conflict on backports. Found this during backport of #5898 #5898 (comment)

* Fix flaky SegmentReplicationITs. This change fixes flakiness with segment replication ITs. It does this by updating the wait condition used to ensure replicas are up to date to wait until a searched docCount is reached instead of output of the Segments API that can change if there are concurrent refreshes. It also does this by updating the method used to assert segment stats to wait until the assertion holds true rather than at a point in time. This method is also updated to assert store metadata directly over API output. Signed-off-by: Marc Handalian <[email protected]> * Fix error message to print expected and actual doc counts. Signed-off-by: Marc Handalian <[email protected]> * PR feedback. Signed-off-by: Marc Handalian <[email protected]> * spotless. Signed-off-by: Marc Handalian <[email protected]> Signed-off-by: Marc Handalian <[email protected]>

mch2 requested review from reta, anasalkouz, andrross, Bukhtawar, CEHENKLE, dblock, gbbafna, setiah, kartg, kotwanikunal, nknize, owaiskazi19, adnapibar, Rishikesh1159, ryanbogan, saratvemulapalli, shwetathareja, dreamer-89, tlfeng, VachaShah and xuezhou25 as code owners January 25, 2023 23:01

mch2 force-pushed the flakysr branch from 175c90c to 0c48ba3 Compare January 25, 2023 23:12

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mch2 force-pushed the flakysr branch from 0c48ba3 to 030a6e1 Compare January 26, 2023 00:05

Fix error message to print expected and actual doc counts.

66f9042

Signed-off-by: Marc Handalian <[email protected]>

mch2 added the skip-changelog label Jan 26, 2023

This was referenced Jan 26, 2023

[BUG] org.opensearch.snapshots.DedicatedClusterSnapshotRestoreIT.testIndexDeletionDuringSnapshotCreationInQueue flaky #5031

Closed

[Segment Replication] Update force segment replication round to be synchronous #5898

Merged

dreamer-89 reviewed Jan 26, 2023

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PR feedback.

eb6f377

Signed-off-by: Marc Handalian <[email protected]>

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mch2 force-pushed the flakysr branch from 16a476d to 04676e7 Compare January 27, 2023 00:36

spotless.

555492f

Signed-off-by: Marc Handalian <[email protected]>

mch2 force-pushed the flakysr branch from 04676e7 to 555492f Compare January 27, 2023 00:57

dreamer-89 approved these changes Jan 27, 2023

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mch2 merged commit ade01ec into opensearch-project:main Jan 27, 2023

mch2 deleted the flakysr branch January 27, 2023 03:46

dreamer-89 added the backport 2.x Backport to 2.x branch label Jan 27, 2023

opensearch-trigger-bot bot mentioned this pull request Jan 27, 2023

[Backport 2.x] Fix flaky SegmentReplicationITs. #6053

Closed

dreamer-89 mentioned this pull request Jan 28, 2023

[Segment Replication] Backport PRs from main #6055

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mch2 mentioned this pull request Feb 10, 2023

Fix flaky segrep test testPrimaryStopped_ReplicaPromoted #6282

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Fix flaky SegmentReplicationITs. #6015

Fix flaky SegmentReplicationITs. #6015

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Fix flaky SegmentReplicationITs. #6015

Fix flaky SegmentReplicationITs. #6015

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