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Posted to notifications@james.apache.org by GitBox <gi...@apache.org> on 2021/10/08 14:05:12 UTC

[GitHub] [james-project] chibenwa opened a new pull request #686: JAMES-3660 Cassandra mailbox creation unstable when high concurency

chibenwa opened a new pull request #686:
URL: https://github.com/apache/james-project/pull/686


   org.apache.james.mailbox.cassandra.CassandraMailboxManagerTest$WithBatchSize.creatingConcurrentlyMailboxesWithSameParentShouldNotFail
   
   tests is enough to trigger instability on the Apache CI
   
   https://ci-builds.apache.org/job/james/job/ApacheJames/job/PR-685/1/
   
   In short, the LWT usage is enough to create contention.
   
   Looking closer at the issue, StoreMailboxManager does numerous defensive SERIAL reads (doing empty paxos commits) which ends up further degrading performance and increase contention.
   
   I believe removing these defensive reads would make our code more stable.
   
   It resulted in faster (x2) test for gConcurrentlyMailboxesWithSameParentShouldNotFail


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[GitHub] [james-project] chibenwa merged pull request #686: JAMES-3660 Cassandra mailbox creation unstable when high concurency

Posted by GitBox <gi...@apache.org>.
chibenwa merged pull request #686:
URL: https://github.com/apache/james-project/pull/686


   


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