[jira] [Commented] (SOLR-5596) OverseerTest.testOverseerFailure - leader node already exists.

["Shalin Shekhar Mangar (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-5596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14053776#comment-14053776 ] 

Shalin Shekhar Mangar commented on SOLR-5596:
---------------------------------------------

I was looking into the logs of this fail today:
http://jenkins.thetaphi.de/job/Lucene-Solr-4.x-Linux/10616/

{code}
   [junit4]   2> 472241 T2893 oazsp.FileTxnLog.commit WARN fsync-ing the write ahead log in SyncThread:0 took 11588ms which will adversely effect operation latency. See the ZooKeeper troubleshooting guide
{code}

This error can be due to a slow machine but it also happens on fast machines if you try to do a lot of writes very fast on ZooKeeper which is what the testShardLeaderChange does. Perhaps we should add a small wait between operations?

Would it make sense to set forcefscync to no for ZooKeeper in our tests? At the very least, it would reduce the spurious failures and let us concentrate on fixing real bugs.

See http://mail-archives.apache.org/mod_mbox/zookeeper-user/201401.mbox/%3CCABtFeVwoXh1d8D+tO0wyLMBap_CRbY6L9i9wh2Le7s1ZkPN+uA@mail.gmail.com%3E
and http://www.edwardcapriolo.com/roller/edwardcapriolo/entry/zookeeper_psuedo_scalability_and_absolute


> OverseerTest.testOverseerFailure - leader node already exists.
> --------------------------------------------------------------
>
>                 Key: SOLR-5596
>                 URL: https://issues.apache.org/jira/browse/SOLR-5596
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>             Fix For: 4.9, 5.0
>
>
> Seeing this a bunch on jenkins - previous leader ephemeral node is still around for some reason.



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