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From "Jun Rao (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-134) Support flush based on timer interval, in addtion to size
Date Tue, 05 May 2009 17:19:32 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-134?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jun Rao updated CASSANDRA-134:
------------------------------

    Attachment: issue134.patchv1

Attach a patch that schedules a background flusher that runs periodically, if a configuration
parameter is set.

> Support flush based on timer interval, in addtion to size
> ---------------------------------------------------------
>
>                 Key: CASSANDRA-134
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-134
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jun Rao
>            Assignee: Jun Rao
>         Attachments: issue134.patchv1
>
>
> Today, the CFs are flushed purely based on the size of the data accumulated in Memtable.
If a table has multiple CFs and some CFs are updated at a much slower pace than others, this
can prevent a larger number of log files from being deleted. This is because the CF bit in
the log header is only turned off when a CF is flushed. A log can't be deleted until all CF
bits in the header are cleared. One solution is to add a background flusher that periodically
force-flushes every CF.

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