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Posted to issues@hbase.apache.org by "binlijin (JIRA)" <ji...@apache.org> on 2016/07/14 06:29:20 UTC
[jira] [Comment Edited] (HBASE-16205) When Cells are not copied to
MSLAB, deep clone it while adding to Memstore
[ https://issues.apache.org/jira/browse/HBASE-16205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15376404#comment-15376404 ]
binlijin edited comment on HBASE-16205 at 7/14/16 6:29 AM:
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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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