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From "binlijin (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-16205) When Cells are not copied to MSLAB, deep clone it while adding to Memstore
Date Thu, 14 Jul 2016 06:29:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15376404#comment-15376404
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binlijin edited comment on HBASE-16205 at 7/14/16 6:29 AM:
-----------------------------------------------------------

I mean if the byte[] is bigger enough, should be all cells that backend by the big byte[]
not copy to the MSLAB?



was (Author: aoxiang):
I mean if the byte[] is bigger enough, should all cells that backend by the big byte[] not
copy to the MSLAB?


> When Cells are not copied to MSLAB, deep clone it while adding to Memstore
> --------------------------------------------------------------------------
>
>                 Key: HBASE-16205
>                 URL: https://issues.apache.org/jira/browse/HBASE-16205
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver
>    Affects Versions: 2.0.0
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>            Priority: Critical
>             Fix For: 2.0.0
>
>         Attachments: HBASE-16205.patch
>
>
> This is imp after HBASE-15180 optimization. After that we the cells flowing in write
path will be backed by the same byte[] where the RPC read the request into. By default we
have MSLAB On and so we have a copy operation while adding Cells to memstore.  This copy might
not be there if
> 1. MSLAB is turned OFF
> 2. Cell size is more than a configurable max size. This defaults to 256 KB
> 3. If the operation is Append/Increment. 
> In such cases, we should just clone the Cell into a new byte[] and then add to memstore.
 Or else we keep referring to the bigger byte[] chunk for longer time.



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