[jira] [Created] (CASSANDRA-10971) Compressed commit log has no backpressure and can OOM

["Ariel Weisberg (JIRA)" <ji...@apache.org>]

Ariel Weisberg created CASSANDRA-10971:
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             Summary: 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
             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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