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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-10971) Compressed commit log has no backpressure and can OOM
Date Mon, 22 Feb 2016 15:32:18 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15143072#comment-15143072
] 

Jonathan Ellis edited comment on CASSANDRA-10971 at 2/22/16 3:31 PM:
---------------------------------------------------------------------

(IMO this should be 3.x only since we have not observed it to happen in the wild.)

Edit: but I'm fine with doing it in 3.0.x as well.


was (Author: jbellis):
(IMO this should be 3.x only since we have not observed it to happen in the wild.)

> 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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