[Segment Replication] Compatibility check for differing lucene codec versions #6730

Poojita-Raj · 2023-03-16T22:55:38Z

Description

This change aims to fail segment replications between the primary and replica if they are utilizing differing lucene codec versions. This is to avoid the current behavior of failing the replica shard in such situations.

Issues Resolved

Resolves #6616

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.

server/src/test/java/org/opensearch/gateway/PrimaryShardAllocatorTests.java

github-actions · 2023-03-16T23:33:32Z

Gradle Check (Jenkins) Run Completed with:

RESULT: FAILURE ❌
URL: https://build.ci.opensearch.org/job/gradle-check/12558/
CommitID: 76f6d82
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?

server/src/test/java/org/opensearch/indices/replication/OngoingSegmentReplicationsTests.java

dreamer-89 · 2023-03-17T00:20:32Z

server/src/test/java/org/opensearch/indices/replication/OngoingSegmentReplicationsTests.java

@@ -74,7 +74,8 @@ public void setUp() throws Exception {
        ShardId testShardId = primary.shardId();

        // This mirrors the creation of the ReplicationCheckpoint inside CopyState
-        testCheckpoint = new ReplicationCheckpoint(testShardId, primary.getOperationPrimaryTerm(), 0L, 0L);
+        testCheckpoint = new ReplicationCheckpoint(testShardId, primary.getOperationPrimaryTerm(), 0L, 0L, "Lucene95");
+        testCheckpoint2 = new ReplicationCheckpoint(testShardId, primary.getOperationPrimaryTerm(), 0L, 0L, "Lucene94");


nit: Can we generate these constants from actual codecs (or helper classes). Is there any utility which provides an older version of codec

github-actions · 2023-03-21T00:12:29Z

Gradle Check (Jenkins) Run Completed with:

RESULT: FAILURE ❌
URL: https://build.ci.opensearch.org/job/gradle-check/12717/
CommitID: 6b4b64b
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 · 2023-03-21T18:24:14Z

Gradle Check (Jenkins) Run Completed with:

RESULT: FAILURE ❌

URL: https://build.ci.opensearch.org/job/gradle-check/12717/

CommitID: 6b4b64b
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?

@Poojita-Raj : Looks like a legit failure.

> Task :server:test

org.opensearch.indices.replication.SegmentReplicationTargetServiceTests > testOnNewCheckpointFromNewPrimaryCancelOngoingReplication FAILED
    Argument(s) are different! Wanted:
    segmentReplicationTargetService.startReplication(
        ReplicationCheckpoint{shardId=[index][0], primaryTerm=100, segmentsGen=4, version=8, size=0, codec=Asserting},
        org.opensearch.index.shard.IndexShard@2a88af1e,
        <any>
    );
    -> at org.opensearch.indices.replication.SegmentReplicationTargetServiceTests.testOnNewCheckpointFromNewPrimaryCancelOngoingReplication(SegmentReplicationTargetServiceTests.java:240)
    Actual invocations have different arguments:
    segmentReplicationTargetService.startReplication(
        org.opensearch.indices.replication.SegmentReplicationTarget$MockitoMock$DfKM6oI5@6ceac65e
    );
    -> at org.opensearch.indices.replication.SegmentReplicationTargetServiceTests.testOnNewCheckpointFromNewPrimaryCancelOngoingReplication(SegmentReplicationTargetServiceTests.java:235)
    segmentReplicationTargetService.onNewCheckpoint(
        ReplicationCheckpoint{shardId=[index][0], primaryTerm=100, segmentsGen=4, version=8, size=0, codec=Asserting},
        org.opensearch.index.shard.IndexShard@2a88af1e
    );
    -> at org.opensearch.indices.replication.SegmentReplicationTargetServiceTests.lambda$testOnNewCheckpointFromNewPrimaryCancelOngoingReplication$1(SegmentReplicationTargetServiceTests.java:225)
        at __randomizedtesting.SeedInfo.seed([387957A7584E7A9:DABA5C54F5D74498]:0)
        at app//org.opensearch.indices.replication.SegmentReplicationTargetServiceTests.testOnNewCheckpointFromNewPrimaryCancelOngoingReplication(SegmentReplicationTargetServiceTests.java:240)

dreamer-89 · 2023-03-21T18:29:37Z

server/src/main/java/org/opensearch/indices/replication/checkpoint/ReplicationCheckpoint.java

@@ -61,6 +78,7 @@ public ReplicationCheckpoint(StreamInput in) throws IOException {
        segmentsGen = in.readLong();
        segmentInfosVersion = in.readLong();
        length = in.readLong();
+        latestSupportedCodec = in.readString();


This needs to be put behind engine version check else it will fail

On target (on newer version 2.7 here) while deserializing request from node on older version. The target would expect more data and thus would fail with error "expecting more bytes but got EOF" error

On target (on older version < 2.7) while deserializing request from node on higher version. The target wouldn't expect more data and thus would fail with error "more bytes" designating more data to consume for extra fields.

We need to hide both length (missed previously) and latestSupportedCodec behind version check.

Yes, I'm adding it along with the test fix

dreamer-89 · 2023-03-21T18:32:17Z

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

+        if (copyState.getCheckpoint()
+            .getLatestSupportedCodec()
+            .equalsIgnoreCase(request.getCheckpoint().getLatestSupportedCodec()) == false) {
+            // cancel(request.getTargetAllocationId(), "Requested unsupported codec version");
+            logger.trace("Requested unsupported codec version {}", request.getCheckpoint().getLatestSupportedCodec());
+            throw new CancellableThreads.ExecutionCancelledException(
+                new ParameterizedMessage("Requested unsupported codec version {}", request.getCheckpoint().getLatestSupportedCodec())
+                    .toString()
+            );


@Poojita-Raj : I think we need integration tests here verifying behavior

Both nodes running on same OS version

Source node running on higher lucene codec

Target node running on higher lucene codec

I am verifying 2 and 3 with the unit tests added in OngoingSegmentReplicationTests. Currently with this release, I'm unable to add in integration tests since it requires having this change in 2 different distributions of OS with differing codecs. But they can definitely be included in further releases.

dreamer-89 · 2023-03-21T18:37:05Z

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

+            .equalsIgnoreCase(request.getCheckpoint().getLatestSupportedCodec()) == false) {
+            // cancel(request.getTargetAllocationId(), "Requested unsupported codec version");
+            logger.trace("Requested unsupported codec version {}", request.getCheckpoint().getLatestSupportedCodec());
+            throw new CancellableThreads.ExecutionCancelledException(


It will be good to have one integration test to verify behavior on target around handling this exception and verifying shard is not failed.

Same as above.

github-actions · 2023-03-23T23:14:12Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      1 org.opensearch.indices.replication.SegmentReplicationAllocationIT.testSingleIndexShardAllocation

URL: https://build.ci.opensearch.org/job/gradle-check/12856/
CommitID: e41e757
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 · 2023-03-23T23:15:48Z

Codecov Report

Merging #6730 (250fb8a) into main (95c6ed9) will decrease coverage by 0.09%.
The diff coverage is 64.04%.

📣 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    #6730      +/-   ##
============================================
- Coverage     70.78%   70.69%   -0.09%     
+ Complexity    59305    59260      -45     
============================================
  Files          4813     4823      +10     
  Lines        283781   284031     +250     
  Branches      40924    40954      +30     
============================================
- Hits         200864   200789      -75     
- Misses        66420    66701     +281     
- Partials      16497    16541      +44

Impacted Files	Coverage Δ
...ch/index/codec/customcodecs/CustomCodecPlugin.java	`0.00% <0.00%> (ø)`
...h/index/codec/customcodecs/CustomCodecService.java	`0.00% <0.00%> (ø)`
.../codec/customcodecs/CustomCodecServiceFactory.java	`0.00% <0.00%> (ø)`
...ustomcodecs/PerFieldMappingPostingFormatCodec.java	`0.00% <0.00%> (ø)`
...rc/main/java/org/opensearch/index/IndexModule.java	`81.92% <ø> (ø)`
...c/main/java/org/opensearch/index/IndexService.java	`73.81% <0.00%> (-0.06%)`	⬇️
...in/java/org/opensearch/indices/IndicesService.java	`64.74% <ø> (+0.70%)`	⬆️
...s/replication/SegmentReplicationTargetService.java	`48.10% <0.00%> (ø)`
.../java/org/opensearch/plugins/IndexStorePlugin.java	`100.00% <ø> (ø)`
...customcodecs/Lucene95CustomStoredFieldsFormat.java	`25.00% <25.00%> (ø)`
... and 11 more

... and 513 files with indirect coverage changes

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

nknize

Quick look I'm not sure how compatible this will be w/ Plugins overriding CodecService

nknize · 2023-03-27T16:49:57Z

server/src/main/java/org/opensearch/indices/replication/checkpoint/ReplicationCheckpoint.java


    public static ReplicationCheckpoint empty(ShardId shardId) {
        return new ReplicationCheckpoint(shardId);
    }

    private ReplicationCheckpoint(ShardId shardId) {
+        codecService = new CodecService(null, null);


The problem here is that plugins can implement a custom CodecService provided through getCustomCodecServiceFactory. When you create a new ReplicationCheckpoint I think you'll need to use the codecService defined by the indexSettings?

Modified the constructor for ReplicationCheckpoint to pick up the codecService set up for the shard. This would use the custom codec service if it's overridden by plugins.

Thanks for the review @nknize! Could you take a second look to see if the changes address your concerns?

github-actions · 2023-03-28T16:41:43Z

Gradle Check (Jenkins) Run Completed with:

RESULT: FAILURE ❌
URL: https://build.ci.opensearch.org/job/gradle-check/12992/
CommitID: d5d63b2
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?

github-actions · 2023-03-28T17:28:17Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      1 org.opensearch.search.SearchWeightedRoutingIT.testSearchAggregationWithNetworkDisruption_FailOpenEnabled

URL: https://build.ci.opensearch.org/job/gradle-check/12994/
CommitID: e2fea70
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 · 2023-03-28T18:18:51Z

server/src/main/java/org/opensearch/indices/replication/checkpoint/ReplicationCheckpoint.java

@@ -30,37 +32,59 @@ public class ReplicationCheckpoint implements Writeable, Comparable<ReplicationC
    private final long segmentsGen;
    private final long segmentInfosVersion;
    private final long length;
+    private final String latestSupportedCodec;


nit: This variabled name seems not appropriate as we are using the codec used in engine.

dreamer-89

LGTM! Thank you @Poojita-Raj for this change.

Let's wait for one more approval on this.

github-actions · 2023-03-28T19:49:49Z

Gradle Check (Jenkins) Run Completed with:

RESULT: SUCCESS ✅
URL: https://build.ci.opensearch.org/job/gradle-check/13002/
CommitID: fc31a76

andrross · 2023-03-31T20:25:14Z

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

@@ -147,6 +148,12 @@ void startSegmentCopy(GetSegmentFilesRequest request, ActionListener<GetSegmentF
     */
    CopyState prepareForReplication(CheckpointInfoRequest request, FileChunkWriter fileChunkWriter) throws IOException {
        final CopyState copyState = getCachedCopyState(request.getCheckpoint());
+        if (copyState.getCheckpoint().getCodec().equalsIgnoreCase(request.getCheckpoint().getCodec()) == false) {


Why the case-insensitive comparison here?

Good catch, that was a remnant of a previous version where we passed in a string of codec name instead of codec service. I'll make the change.

andrross · 2023-03-31T20:26:33Z

server/src/main/java/org/opensearch/indices/replication/checkpoint/ReplicationCheckpoint.java

    }

    public ReplicationCheckpoint(StreamInput in) throws IOException {
        shardId = new ShardId(in);
        primaryTerm = in.readLong();
        segmentsGen = in.readLong();
        segmentInfosVersion = in.readLong();
-        length = in.readLong();
+        if (in.getVersion().onOrAfter(Version.V_2_7_0)) {
+            length = in.readLong();


Why is length inside this version guard where previously it was not?

Also, how does this work? 2.7 doesn't understand this new field (yet). I'm guessing there is no bwc coverage for this functionality?

length was a field introduced by somebody else recently but seems like they forgot to keep it in the version guard which is why it's included here.
No, there's no bwc coverage for this but there will be rolling upgrade coverage for this moving forward.

andrross · 2023-03-31T20:32:10Z

server/src/main/java/org/opensearch/indices/replication/checkpoint/ReplicationCheckpoint.java

        this.shardId = shardId;
        primaryTerm = SequenceNumbers.UNASSIGNED_PRIMARY_TERM;
        segmentsGen = SequenceNumbers.NO_OPS_PERFORMED;
        segmentInfosVersion = SequenceNumbers.NO_OPS_PERFORMED;
        length = 0L;
+        codec = codecService.codec("default").getName();


Since all you need here is the name, I would recommend passing in a String instead of a CodecService. Let the caller figure out how to get the name from the CodecService. I think this means you can probably avoid exposing the CodecService from IndexShard and instead only expose the codec service name.

github-actions · 2023-04-03T16:45:41Z

Gradle Check (Jenkins) Run Completed with:

RESULT: FAILURE ❌
URL: https://build.ci.opensearch.org/job/gradle-check/13302/
CommitID: 3559f0a
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?

andrross · 2023-04-03T21:07:05Z

server/src/main/java/org/opensearch/index/shard/IndexShard.java

@@ -494,6 +494,10 @@ public boolean isSystem() {
        return indexSettings.getIndexMetadata().isSystem();
    }

+    public CodecService codecService() {


Can this become getCodecName() since it looks like the only thing this is used for is to get the name?

github-actions · 2023-04-04T15:40:42Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      1 org.opensearch.indices.replication.SegmentReplicationRelocationIT.testRelocateWhileContinuouslyIndexingAndWaitingForRefresh

URL: https://build.ci.opensearch.org/job/gradle-check/13389/
CommitID: 8f8bf4d
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

andrross · 2023-04-04T15:57:28Z

server/src/main/java/org/opensearch/index/shard/IndexShard.java

@@ -494,6 +494,10 @@ public boolean isSystem() {
        return indexSettings.getIndexMetadata().isSystem();
    }

+    public String getCodecName() {
+        return codecService.codec("default").getName();


There is a CodecService.DEFAULT_CODEC constant that can be used here. Also, I'm wondering if this should be getDefaultCodecName() or getCodecName(String codec)? Currently it makes the decision to look up the "default" codec but it is not apparent in the method signature. At a minimum you should add documentation to this public method. What do you think?

You're right, this naming makes sense. Added in the change + documentation for the method.

Signed-off-by: Poojita Raj <[email protected]>

github-actions · 2023-04-04T23:11:17Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      1 org.opensearch.indices.replication.SegmentReplicationRelocationIT.testPrimaryRelocationWithSegRepFailure
      1 org.opensearch.cluster.allocation.AwarenessAllocationIT.testThreeZoneOneReplicaWithForceZoneValueAndLoadAwareness

URL: https://build.ci.opensearch.org/job/gradle-check/13438/
CommitID: 250fb8a
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

…versions (#6730) * compatCheck Signed-off-by: Poojita Raj <[email protected]> * refactor Signed-off-by: Poojita Raj <[email protected]> --------- Signed-off-by: Poojita Raj <[email protected]> (cherry picked from commit c334bbd) Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

…versions (opensearch-project#6730) * compatCheck Signed-off-by: Poojita Raj <[email protected]> * refactor Signed-off-by: Poojita Raj <[email protected]> --------- Signed-off-by: Poojita Raj <[email protected]> Signed-off-by: Valentin Mitrofanov <[email protected]>

…versions (#6730) (#6991) This change aims to fail segment replications between the primary and replica if they are utilizing differing lucene codec versions. This is to avoid the current behavior of failing the replica shard in such situations. (cherry picked from commit c334bbd) Signed-off-by: Poojita Raj <[email protected]>

Poojita-Raj requested review from reta, anasalkouz, andrross, Bukhtawar, CEHENKLE, dblock, gbbafna, setiah, kartg, kotwanikunal, mch2, nknize, owaiskazi19, Rishikesh1159, ryanbogan, saratvemulapalli, shwetathareja, dreamer-89, tlfeng, VachaShah and xuezhou25 as code owners March 16, 2023 22:55

Poojita-Raj added the skip-changelog label Mar 16, 2023

dreamer-89 reviewed Mar 16, 2023

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server/src/test/java/org/opensearch/gateway/PrimaryShardAllocatorTests.java Outdated Show resolved Hide resolved

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Poojita-Raj force-pushed the compatCheck branch from 76f6d82 to 6b4b64b Compare March 20, 2023 23:48

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Poojita-Raj force-pushed the compatCheck branch from 519e251 to ec7cbc0 Compare March 22, 2023 23:47

Poojita-Raj requested a review from dreamer-89 March 24, 2023 15:30

nknize reviewed Mar 27, 2023

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Poojita-Raj force-pushed the compatCheck branch from fc31a76 to 3559f0a Compare April 3, 2023 16:27

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Poojita-Raj force-pushed the compatCheck branch from 3559f0a to 8f8bf4d Compare April 4, 2023 15:10

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Poojita-Raj added 2 commits April 4, 2023 15:36

compatCheck

94f8059

Signed-off-by: Poojita Raj <[email protected]>

refactor

250fb8a

Signed-off-by: Poojita Raj <[email protected]>

Poojita-Raj force-pushed the compatCheck branch from 8f8bf4d to 250fb8a Compare April 4, 2023 22:37

Poojita-Raj requested a review from andrross April 4, 2023 22:39

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andrross added the backport 2.x Backport to 2.x branch label Apr 4, 2023

andrross merged commit c334bbd into opensearch-project:main Apr 5, 2023

opensearch-trigger-bot bot mentioned this pull request Apr 5, 2023

[Backport 2.x] [Segment Replication] Compatibility check for differing lucene codec versions #6991

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Poojita-Raj mentioned this pull request Apr 7, 2023

[BUG][Segment Replication] Failing tests with segment replication enabled due to codec check #7058

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[Segment Replication] Compatibility check for differing lucene codec versions #6730

[Segment Replication] Compatibility check for differing lucene codec versions #6730

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[Segment Replication] Compatibility check for differing lucene codec versions #6730

[Segment Replication] Compatibility check for differing lucene codec versions #6730

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Poojita-Raj commented Mar 16, 2023

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