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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10689) Explore advisory caching for MR over snapshot scans
Date Mon, 10 Mar 2014 18:29:49 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13926010#comment-13926010
] 

Colin Patrick McCabe commented on HBASE-10689:
----------------------------------------------

No problem.  I agree it can get a bit confusing.  It would be nice to see some numbers from
tweaking readahead on HBase when you guys get a chance.  I guess the gain will depend partly
on how much caching HBase is doing.  If HBase is caching that extra 4 MB that it read, then
it's not such a loss.  If it's throwing that away, then making readahead shorter may be a
big gain.

> Explore advisory caching for MR over snapshot scans
> ---------------------------------------------------
>
>                 Key: HBASE-10689
>                 URL: https://issues.apache.org/jira/browse/HBASE-10689
>             Project: HBase
>          Issue Type: Improvement
>          Components: mapreduce, Performance
>            Reporter: Nick Dimiduk
>
> Per [comment|https://issues.apache.org/jira/browse/HBASE-10660?focusedCommentId=13921730&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13921730]
on HBASE-10660, explore using the new HDFS advisory caching feature introduced in HDFS-4817
for TableSnapshotInputFormat.



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