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Date: Tue, 16 Feb 2016 05:25:18 +0000 (UTC)
From: "ramkrishna.s.vasudevan (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-15205) Do not find the replication scope
 for every WAL#append()
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    [ https://issues.apache.org/jira/browse/HBASE-15205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15148116#comment-15148116 ] 

ramkrishna.s.vasudevan commented on HBASE-15205:
------------------------------------------------

Ping for reviews. 

> Do not find the replication scope for every WAL#append()
> --------------------------------------------------------
>
>                 Key: HBASE-15205
>                 URL: https://issues.apache.org/jira/browse/HBASE-15205
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Minor
>             Fix For: 2.0.0
>
>         Attachments: HBASE-15205.patch, HBASE-15205_1.patch, HBASE-15205_2.patch, HBASE-15205_3.patch, ScopeWALEdits.jpg, ScopeWALEdits_afterpatch.jpg
>
>
> After the byte[] and char[] the other top contributor for lot of GC (though it is only 2.86%) is the UTF_8.newDecoder.
> This happens because for every WAL append we try to calculate the replication scope associate with the families associated with the TableDescriptor. I think per WAL append doing this is very costly and creates lot of garbage. 


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