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From "Ashu Pachauri (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17057) Minor compactions should also drop page cache behind reads
Date Thu, 02 Feb 2017 01:47:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17057?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15849264#comment-15849264
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Ashu Pachauri commented on HBASE-17057:
---------------------------------------

[~ghelmling] Sure, I'll add the config keys to hbase-default.xml. I also don't see a reason
why someone would want to set it to false in general. 
You are right, this change is not effective on master; created HBASE-17582 to track it.

> Minor compactions should also drop page cache behind reads
> ----------------------------------------------------------
>
>                 Key: HBASE-17057
>                 URL: https://issues.apache.org/jira/browse/HBASE-17057
>             Project: HBase
>          Issue Type: Improvement
>          Components: Compaction
>            Reporter: Ashu Pachauri
>            Assignee: Ashu Pachauri
>             Fix For: 1.3.1
>
>         Attachments: HBASE-17057.V1.patch
>
>
> Long compactions currently drop cache behind reads/writes so that they don't pollute
the page cache but short compactions don't do that. The bulk of the data is actually read
during minor compactions instead of major compactions,  and thrashes the page cache since
it's mostly not needed. 
> We should drop page cache behind minor compactions too. 



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