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From "Chris Goffinet (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-2178) Memtable Flush writers doesn't actually flush in parallel
Date Thu, 17 Feb 2011 02:36:24 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-2178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Goffinet updated CASSANDRA-2178:
--------------------------------------

    Attachment: 0001-Set-the-core-min-pool-size-to-memtable_flush_writers-v2.patch

Use a SynchronousQueue instead

> Memtable Flush writers doesn't actually flush in parallel
> ---------------------------------------------------------
>
>                 Key: CASSANDRA-2178
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2178
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 0.7.2, 0.8
>            Reporter: Chris Goffinet
>            Assignee: Chris Goffinet
>            Priority: Minor
>             Fix For: 0.8
>
>         Attachments: 0001-Set-the-core-min-pool-size-to-memtable_flush_writers-v2.patch,
0001-Set-the-core-min-pool-size-to-memtable_flush_writers.patch
>
>
> The flushWriter JMXEnabledThreadPoolExecutor sets the core pool min to 1, and sets the
LBQ to DatabaseDescriptor.getFlushWriters(). Increasing memtable_flush_writers should allow
us to flush more in parallel. The pool will not grow until LBQ fills up to DatabaseDescriptor.getFlushWriters().


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