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From "Sylvain Lebresne (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-3619) Use a separate writer thread for the SSTableSimpleUnsortedWriter
Date Tue, 13 Dec 2011 01:37:30 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-3619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sylvain Lebresne updated CASSANDRA-3619:
----------------------------------------

    Attachment: 0001-Add-separate-writer-thread.patch

Patch attached. On a small test that writes  1M rows with 10 columns, I see a ~30% improvement
(but with CASSANDRA-3618 applied, otherwise it's not so clear).
                
> Use a separate writer thread for the SSTableSimpleUnsortedWriter
> ----------------------------------------------------------------
>
>                 Key: CASSANDRA-3619
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3619
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>    Affects Versions: 0.8.1
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>             Fix For: 1.1
>
>         Attachments: 0001-Add-separate-writer-thread.patch
>
>
> Currently SSTableSimpleUnsortedWriter doesn't use any threading. This means that the
thread using it is blocked while the buffered data is written on disk and that nothing is
written on disk while data is added.

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