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https://issues.apache.org/jira/browse/OAK-2961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14595539#comment-14595539
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Davide Giannella commented on OAK-2961:
---------------------------------------
By looking at the code, it seems the above WARN could happen when over
the cluster, one node started and maybe already completed the first
indexing, but the update is not yet visible to all other nodes. They
will then try to perform the initial indexing. That should be trapped
either by the merging at mongo layer, ensuring therefore data
consistency, or by the concurrency check if the process is still
running.
[~alexparvulescu], [~chetanm] thoughts? I'm for committing the patch
to trunk and consider this as fixed.
> Async index fails with OakState0001: Unresolved conflicts in /:async
> --------------------------------------------------------------------
>
> Key: OAK-2961
> URL: https://issues.apache.org/jira/browse/OAK-2961
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: mongomk, query
> Affects Versions: 1.2.2, 1.0.14, 1.4
> Reporter: Davide Giannella
> Assignee: Davide Giannella
> Labels: resilience
> Fix For: 1.3.1, 1.2.3
>
> Attachments: OAK-2961.patch
>
>
> When running on a mongo cluster, in case of high activity the async index
> could fail with the following exception.
> Reproduced with LucenePropertyIndex.
> {noformat}
> 10:55:13.069 [oak-scheduled-executor-5] WARN
> o.a.j.o.p.index.AsyncIndexUpdate - [async] The index update failed
> org.apache.jackrabbit.oak.api.CommitFailedException: OakState0001: Unresolved
> conflicts in /:async
> at
> org.apache.jackrabbit.oak.plugins.commit.ConflictValidator.failOnMergeConflict(ConflictValidator.java:84)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.commit.ConflictValidator.propertyAdded(ConflictValidator.java:54)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.spi.commit.EditorDiff.propertyAdded(EditorDiff.java:82)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:378)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.spi.commit.EditorDiff.childNodeChanged(EditorDiff.java:148)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:400)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.spi.commit.EditorDiff.process(EditorDiff.java:52)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.spi.commit.EditorHook.processCommit(EditorHook.java:55)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.spi.commit.CompositeHook.processCommit(CompositeHook.java:61)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch$InMemory.merge(DocumentNodeStoreBranch.java:528)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch.merge0(DocumentNodeStoreBranch.java:219)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreBranch.merge(DocumentNodeStoreBranch.java:171)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentRootBuilder.merge(DocumentRootBuilder.java:158)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.merge(DocumentNodeStore.java:1466)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.index.AsyncIndexUpdate.mergeWithConcurrencyCheck(AsyncIndexUpdate.java:467)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.index.AsyncIndexUpdate.access$4(AsyncIndexUpdate.java:445)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.index.AsyncIndexUpdate$AsyncUpdateCallback.<init>(AsyncIndexUpdate.java:201)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.index.AsyncIndexUpdate.updateIndex(AsyncIndexUpdate.java:372)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.index.AsyncIndexUpdate.run(AsyncIndexUpdate.java:320)
> ~[classes/:na]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> [na:1.7.0_60]
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
> [na:1.7.0_60]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
> [na:1.7.0_60]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
> [na:1.7.0_60]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> [na:1.7.0_60]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> [na:1.7.0_60]
> at java.lang.Thread.run(Thread.java:745) [na:1.7.0_60]
> {noformat}
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