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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1011) Keep data in Memcache until specified TTL or memory pressure
Date Tue, 25 May 2010 01:00:24 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12870929#action_12870929
] 

ryan rawson commented on HBASE-1011:
------------------------------------

Hi,

This issue is invalid and has been closed. The functionality has been more or less effectively
replaced by effective block caching in 0.20+.

> Keep data in Memcache until specified TTL or memory pressure
> ------------------------------------------------------------
>
>                 Key: HBASE-1011
>                 URL: https://issues.apache.org/jira/browse/HBASE-1011
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Jonathan Gray
>
> In thinking about ways to improve random-read access, a very typical access pattern for
web sites is to primarily be retrieving from new records but having a much larger total dataset
in a given table.
> If you could specify a Memcache flush TTL, you could keep "past 24 hours" in memory and
this would give you a sliding window updated on memcache flushes.  Must also adapt to regionserver
memory pressure.

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