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From "Benjamin Lerer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-10971) Compressed commit log has no backpressure and can OOM
Date Wed, 16 Mar 2016 17:29:33 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-10971?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Benjamin Lerer updated CASSANDRA-10971:
---------------------------------------
       Resolution: Fixed
    Fix Version/s:     (was: 3.0.x)
                       (was: 3.x)
                   3.5
                   3.0.5
           Status: Resolved  (was: Ready to Commit)

Committed into 3.0 at 9995521fb9b3f510ee9c7012d75e6970ec7d5fb7 and into 3.5 at ee40e3b4529aa77d4d83fc3e7073902402cb3753.
Merged into trunk

> Compressed commit log has no backpressure and can OOM
> -----------------------------------------------------
>
>                 Key: CASSANDRA-10971
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10971
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local Write-Read Paths
>            Reporter: Ariel Weisberg
>            Assignee: Ariel Weisberg
>             Fix For: 3.0.5, 3.5
>
>         Attachments: 10971-3.0.txt, 10971-3.5.txt
>
>
> I validated this via a unit test that slowed the ability of the log to drain to the filesystem.
The compressed commit log will keep allocating buffers pending compression until it OOMs.
> I have a fix that am not very happy with because the whole signal a thread to allocate
a segment that depends on a resource that may not be available results in some obtuse usage
of {{CompleatableFuture}} to rendezvous available buffers with {{CommitLogSegmentManager}}
thread waiting to finish constructing a new segment. The {{CLSM}} thread is in turn signaled
by the thread(s) that actually wants to write to the next segment, but aren't able to do it
themselves.



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