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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12202) Support DirectByteBuffer usage in HFileBlock
Date Wed, 08 Oct 2014 15:37:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14163625#comment-14163625
] 

stack commented on HBASE-12202:
-------------------------------

Good one [~anoop.hbase] I was looking in these parts these last few days.  I was trying to
shoehorn in using the ByteBuffer API on DFSInputStream HBASE-11710 to try and see if speedup.
 If we got data from DFS in ByteBuffers, we might be able to make use of the native checksummers
(probably not directly, not w/o work -- checksumming is from 20--30% of CPU used in simple
tests).  So, read into offheap BB and passing to checksummer offheap could be a win.  Would
mean we' need to change read to be ByteBuffer rather than byte [] -based.  Seemed like substantial
change but we are doing a bit of ByteBuffer slinging already in here in HFileBlock? WDYT?

> Support DirectByteBuffer usage in HFileBlock
> --------------------------------------------
>
>                 Key: HBASE-12202
>                 URL: https://issues.apache.org/jira/browse/HBASE-12202
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver, Scanners
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>             Fix For: 2.0.0, 0.99.1
>
>




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