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Date: Fri, 28 May 2010 17:05:38 -0400 (EDT)
From: "Brandon Williams (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Subject: [jira] Updated: (CASSANDRA-1099) make CFS.flushWriter_ size
 configurable
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     [ https://issues.apache.org/jira/browse/CASSANDRA-1099?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brandon Williams updated CASSANDRA-1099:
----------------------------------------

    Attachment: 1099.txt

Updated patch which comments out the config, which will default the number of writer threads to the number of data directories.

> make CFS.flushWriter_ size configurable
> ---------------------------------------
>
>                 Key: CASSANDRA-1099
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1099
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Brandon Williams
>            Priority: Minor
>             Fix For: 0.7
>
>         Attachments: 1099.txt
>
>
> For small heaps (including our out-of-the-box 1G) we want to allow reducing this from the automatic (1 + 2 * DatabaseDescriptor.getAllDataFileLocations().length); having 3 memtables in the queue, plus another being written, is over 200MB which is a significant amount of data for the GC to chew through (see CASSANDRA-1014).
> For large heaps, we might also want to allow *increasing* this value, to accommodate load spikes better.
> Unfortunately making this configurable at runtime does not appear to be an option due to the lack of a setCapacity method on any of the BlockingQueue classes.

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