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