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https://issues.apache.org/jira/browse/CASSANDRA-10971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15153110#comment-15153110
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Ariel Weisberg commented on CASSANDRA-10971:
--------------------------------------------
Pushed an updated and much more succinct version. Tests are running now.
> 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: Improvement
> Components: Local Write-Read Paths
> Reporter: Ariel Weisberg
> Assignee: Ariel Weisberg
> Fix For: 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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