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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11346) Enable cacheonwrite for index and bloom blocks by default
Date Mon, 16 Jun 2014 13:50:01 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14032434#comment-14032434
] 

Nick Dimiduk commented on HBASE-11346:
--------------------------------------

For a write-heavy application generating lots of small HFiles, this is true. The idea is to
reduce the impact of compactions on concurrent reads. There's probably a threshold at which
point it makes sense to keep this disabled.

> Enable cacheonwrite for index and bloom blocks by default
> ---------------------------------------------------------
>
>                 Key: HBASE-11346
>                 URL: https://issues.apache.org/jira/browse/HBASE-11346
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>    Affects Versions: 0.99.0, 0.98.4
>            Reporter: Nick Dimiduk
>
> Theory is, this will reduce the cost of compactions on a mixed workload cluster, reducing
the number of seeks for the first blocks from the new HFile from ~4 to ~1.



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