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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6079) Memtables flush is delayed when having a lot of batchlog activity, making node OOM
Date Mon, 23 Sep 2013 18:19:03 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13774814#comment-13774814
] 

Jonathan Ellis commented on CASSANDRA-6079:
-------------------------------------------

Remember, this is the *replay* path.  If it's running, the mutation is already delayed, probably
because the target node was down.  So delaying for compactions doesn't seem like a dealbreaker
to me.  Especially since that leaves more iops to keep the rest of the system healthy and
not go down ourselves. :)
                
> Memtables flush is delayed when having a lot of batchlog activity, making node OOM
> ----------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-6079
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6079
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Oleg Anastasyev
>            Assignee: Oleg Anastasyev
>            Priority: Minor
>             Fix For: 1.2.11, 2.0.2
>
>         Attachments: NoWaitBatchlogCompaction.diff
>
>
> Both MeteredFlusher and BatchlogManager share the same OptionalTasks thread. So, when
batchlog manager processes its tasks no flushes can occur. Even more, batchlog manager waits
for batchlog CF compaction to finish.
> On a lot of batchlog activity this prevents memtables from flush for a long time, making
the node OOM.
> Fixed this by moving batchlog to its own thread and not waiting for batchlog compaction
to finish.

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