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From "Ariel Weisberg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10971) Compressed commit log has no backpressure and can OOM
Date Wed, 06 Jan 2016 19:16:39 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15086097#comment-15086097
] 

Ariel Weisberg commented on CASSANDRA-10971:
--------------------------------------------

|[trunk code|https://github.com/apache/cassandra/compare/trunk...aweisberg:CASSANDRA-10971-trunk?expand=1]|[utest|http://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-10971-trunk-testall/]|[dtest|http://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-10971-trunk-dtest/]|
|[3.0 code|https://github.com/apache/cassandra/compare/cassandra-3.0...aweisberg:CASSANDRA-10971-3.0?expand=1]|[utest|http://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-10971-3.0-testall/]|[dtest|http://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-10971-3.0-dtest/]|
|[2.2 code|https://github.com/apache/cassandra/compare/cassandra-2.2...aweisberg:CASSANDRA-10971-2.2?expand=1]|[utest|http://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-10971-2.2-testall/]|[dtest|http://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-10971-2.2-dtest/]|

> 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: 2.2.x, 3.0.x, 3.x
>
>
> 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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