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From "Steve Rowe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SOLR-10420) Solr 6.x leaking one SolrZkClient instance per second
Date Thu, 13 Apr 2017 12:12:41 GMT

     [ https://issues.apache.org/jira/browse/SOLR-10420?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Rowe updated SOLR-10420:
------------------------------
    Attachment: OverseerTest.DEBUG.58.stdout
                OverseerTest.DEBUG.48.stdout
                OverseerTest.DEBUG.43.stdout

I got 5 failures out of 100, attaching 3 of them here: [^OverseerTest.DEBUG.43.stdout], [^OverseerTest.DEBUG.48.stdout],
[^OverseerTest.DEBUG.58.stdout]

> Solr 6.x leaking one SolrZkClient instance per second
> -----------------------------------------------------
>
>                 Key: SOLR-10420
>                 URL: https://issues.apache.org/jira/browse/SOLR-10420
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>    Affects Versions: 5.5.2, 6.5, 6.4.2
>            Reporter: Markus Jelsma
>         Attachments: OverseerTest.106.stdout, OverseerTest.119.stdout, OverseerTest.80.stdout,
OverseerTest.DEBUG.43.stdout, OverseerTest.DEBUG.48.stdout, OverseerTest.DEBUG.58.stdout,
SOLR-10420.patch, SOLR-10420.patch, SOLR-10420.patch
>
>
> One of our nodes became berzerk after a restart, Solr went completely nuts! So i opened
VisualVM to keep an eye on it and spotted a different problem that occurs in all our Solr
6.4.2 and 6.5.0 nodes.
> It appears Solr is leaking one SolrZkClient instance per second via DistributedQueue$ChildWatcher.
That one per second is quite accurate for all nodes, there are about the same amount of instances
as there are seconds since Solr started. I know VisualVM's instance count includes objects-to-be-collected,
the instance count does not drop after a forced garbed collection round.
> It doesn't matter how many cores or collections the nodes carry or how heavy traffic
is.



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