[jira] [Updated] (HBASE-15205) Do not find the replication scope for every WAL#append()

["ramkrishna.s.vasudevan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-15205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ramkrishna.s.vasudevan updated HBASE-15205:
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    Attachment: ScopeWALEdits.jpg

This pic shows how the scopeOfWalEdits creates lot of objects in a 1 min profile run. 

> 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: ScopeWALEdits.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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