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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10772) Use ByteRanges instead of ByteBuffers in BlockCache
Date Wed, 26 Mar 2014 10:50:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13947793#comment-13947793
] 

ramkrishna.s.vasudevan commented on HBASE-10772:
------------------------------------------------

Would like bring up a discussion here, can open a relevant JIRA for that.
HBASE-10771 adds some geXXX and putXXX type of APIs, put() will add a PBR itself. 
While working on BR inside BlockCache, the current way of BlockCache that use offheap - tries
to slice the given DBB and uses a DBB buffer pool.  So if we need such use cases with BRs
instead of DBB and those BRs should be offheap, how do we do that.  So should we add some
APIs like slice, duplicate() in DBB to BRs and try reusing the allocated BRs? Currently we
don't have any offheap based BR.  So if we try to create a BR that is backed by DBB and to
ensure the current behaviour works of BR pools etc we may need such things in BR also. What
do you think?

> Use ByteRanges instead of ByteBuffers in BlockCache
> ---------------------------------------------------
>
>                 Key: HBASE-10772
>                 URL: https://issues.apache.org/jira/browse/HBASE-10772
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>
> Try replacing the BBs with Byte Ranges in Block cache.  See if this can be done in a
pluggable way.



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