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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5497) Use allocator information to improve memtable memory usage estimate
Date Thu, 18 Apr 2013 18:34:14 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13635493#comment-13635493
] 

Jonathan Ellis commented on CASSANDRA-5497:
-------------------------------------------

attached.
                
> Use allocator information to improve memtable memory usage estimate
> -------------------------------------------------------------------
>
>                 Key: CASSANDRA-5497
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5497
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.0.0
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>            Priority: Minor
>             Fix For: 1.1.12
>
>         Attachments: 5497.txt
>
>
> A user reported that Cassandra's estimate of memtable space used was off by a factor
of between 3 and 10 for his counter columnfamilies.
> We may or may not be able to fix the counter estimate (counter merging is a cranky best,
and unlike normal merging can involve allocating new objects), but we can definitely use the
SlabAllocator information to cap the error in our estimate at a fairly low amount.

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