[jira] Updated: (CASSANDRA-1187) make the number of compaction threads configurable

["Sean Bridges (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-1187?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Bridges updated CASSANDRA-1187:
------------------------------------

    Attachment: CASSANDRA-1187.patch

This patch allows setting the number of threads used in compaction.

A queue is created for each column family, and only one compaction thread is allowed to compact a column family at a time.

> make the number of compaction threads configurable
> --------------------------------------------------
>
>                 Key: CASSANDRA-1187
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1187
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.6.1
>            Reporter: Sean Bridges
>         Attachments: CASSANDRA-1187.patch
>
>
> On our test machines, compaction is the limiting factor when we are writing to Cassandra.  It's easy to write to Cassandra faster than the single compaction thread can keep up, leading to a large number of sstables.
> In one extreme example, we inserted a TB of data into a single cassandra node overnight, and ended up with 100,000 sstables, which took another two days to finish compacting.
> If the number of compaction threads was configurable, we could tune cassandra to support a higher write workload.

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