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From "Ariel Weisberg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8639) Can OOM on CL replay with dense mutations
Date Fri, 04 Dec 2015 16:39:11 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15041726#comment-15041726
] 

Ariel Weisberg commented on CASSANDRA-8639:
-------------------------------------------

I think that is fine. We can always backport if there is demand.

> Can OOM on CL replay with dense mutations
> -----------------------------------------
>
>                 Key: CASSANDRA-8639
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8639
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Local Write-Read Paths
>            Reporter: T Jake Luciani
>            Assignee: Ariel Weisberg
>            Priority: Minor
>             Fix For: 2.1.x
>
>
> If you write dense mutations with many clustering keys, the replay of the CL can quickly
overwhelm a node on startup.  This looks to be caused by the fact we only ensure there are
1000 mutations in flight at a time. but those mutations could have thousands of cells in them.
> A better approach would be to limit the CL replay to the amount of memory in flight using
cell.unsharedHeapSize()



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