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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9382) Snapshot file descriptors not getting purged (possible fd leak)
Date Tue, 28 Jul 2015 16:16:05 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14644592#comment-14644592
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Benedict commented on CASSANDRA-9382:
-------------------------------------

+1.

This bug shouldn't affect 2.1+, however there's no reason to track hotness anyway, even if
it closes the resources safely.

> Snapshot file descriptors not getting purged (possible fd leak)
> ---------------------------------------------------------------
>
>                 Key: CASSANDRA-9382
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9382
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Mark Curtis
>            Assignee: Yuki Morishita
>             Fix For: 2.1.x, 2.0.x
>
>         Attachments: yjp-heapdump.png
>
>
> OpsCenter has the repair service which does a lot of small range repairs. Each repair
would generate a snapshot as per normal. The cluster was showing a steady increase in disk
space over the course of a couple of days and the only way to workaround the issue was to
restart the node.
> Upon some further inspection it was seen that a lsof output of the cassandra process
was still showing file descriptors for snapshots that no longer existed on the file system.
For example:
> {code}
> ava    5822 cassandra  DEL    REG             202,32                 7359833 /media/ephemeral1/cassandra/data/somekeyspace/table1/snapshots/669a3a30-f3d3-11e4-bec6-3f6c4fb06498/somekeyspace-table1-jb-897689-Data.db
> {code}
> We also took a heapdump which basically showed the same thing, lots of references to
these file handles. We checked the logs for any errors especially relating to repairs that
might have failed but there was nothing observed
> The repair service logs in OpsCenter showed also that all repairs (1000s of them) had
completed successfully, again showing that there was no repair issue.
> I have not yet been able to reproduce the issue locally on a test box. The cluster that
this original issue appeared on was a production cluster with the following spec:
> cassandra_versions: 2.0.14.352
> cluster_cores : 8, 
> cluster_instance_types : i2.2xlarge
> cluster_os : Amazon linux amd64 
> node count: 4
> node java version: Oracle Java 1.7.0_51



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