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https://issues.apache.org/jira/browse/SOLR-4099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13502049#comment-13502049
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Commit Tag Bot commented on SOLR-4099:
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[trunk commit] Mark Robert Miller
http://svn.apache.org/viewvc?view=revision&revision=1412140
SOLR-4099: Allow the collection api work queue to make forward progress even
when it's watcher is not fired for some reason.
> Suspect zookeeper client thread doesn't call back the watcher, that occur the
> overseer collection can't work normal.
> --------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-4099
> URL: https://issues.apache.org/jira/browse/SOLR-4099
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 4.0-ALPHA, 4.0-BETA, 4.0
> Environment: Zookeeper version: 3.2
> Reporter: Raintung Li
> Assignee: Mark Miller
> Fix For: 4.1, 5.0
>
> Attachments: patch-4099.txt
>
> Original Estimate: 12h
> Remaining Estimate: 12h
>
> In test environment, our zookeeper version is old that our requirement
> version. Not use solr default 3.3.6 version.
> The overseer collection processor stop work. Trace the dump, the overseer
> wait for LatchChildWatcher.await.
> Check the zookeeper /overseer/collection-queue-work, block a lot of operation
> for collection.
> Check the logic, suspect the zookeeper client doesn't call back the
> watchevent that register the path "/overseer/collection-queue-work", unlucky
> the log level is debug.
> This case doesn't happen often, very little. But if it happen, it is fatal,
> we have to stop the leader server.
> Suggest the compensate solution, that doesn't await until notify. Only wait
> some time that maybe it is ten minutes or a half of hour or other value to
> recheck the queue again. Of cause if get the notify, that can direct work
> normal.
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