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https://issues.apache.org/jira/browse/OAK-440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13496051#comment-13496051
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Mete Atamel commented on OAK-440:
---------------------------------
I think this has to do with the FIXME in CommitCommand#saveAndSetHeadRevision.
Basically, every concurrent update is assumed to be a conflict by default, so
this results in a lot of conflicts and the number of retries for CommitCommand
runs out pretty quickly.
> Concurrency issue when 3 microkernels are writing in the same db
> ----------------------------------------------------------------
>
> Key: OAK-440
> URL: https://issues.apache.org/jira/browse/OAK-440
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: mongomk
> Environment: linux ubuntu + 1 mongo database instance
> Reporter: Tudor Rogoz
>
> See test ConcurrentWriteMultipleMkMongoTest.testConcurrency().
> org.apache.jackrabbit.mongomk.impl.command.exception.ConflictingCommitException
> on each Thread when 3 mongo microkernels are writing nodes on the same
> database.
> Run the test with: 1000 nodes, 10 nodes for the number of children, and 10
> nodes per commit.
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