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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2013/06/19 15:34:20 UTC

[jira] [Commented] (CASSANDRA-5661) Discard pooled readers for cold data

    [ https://issues.apache.org/jira/browse/CASSANDRA-5661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13687985#comment-13687985 ] 

Jonathan Ellis commented on CASSANDRA-5661:
-------------------------------------------

One possibility would be to have a {{CLHM<SSTableReader, Queue<RandomAccessReader>>}} that PooledSegmentedFile looks itself up in.

[~xedin], do you have time to take a stab at this?
                
> Discard pooled readers for cold data
> ------------------------------------
>
>                 Key: CASSANDRA-5661
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5661
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.2.1
>            Reporter: Jonathan Ellis
>            Assignee: Pavel Yaskevich
>             Fix For: 1.2.6
>
>
> Reader pooling was introduced in CASSANDRA-4942 but pooled RandomAccessReaders are never cleaned up until the SSTableReader is closed.  So memory use is "the worst case simultaneous RAR we had open for this file, forever."
> We should introduce a global limit on how much memory to use for RAR, and evict old ones.

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