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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12748) RegionCoprocessorHost.execOperation creates too many iterator objects
Date Fri, 25 Sep 2015 03:46:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14907519#comment-14907519
] 

Lars Hofhansl commented on HBASE-12748:
---------------------------------------

+1

Super minor nit: {{this.list = Collections.unmodifiableList(new ArrayList<E>());}} ==
{{this.list = Collections.emptyList();}}

Want me to do a local perf run with it?


> RegionCoprocessorHost.execOperation creates too many iterator objects
> ---------------------------------------------------------------------
>
>                 Key: HBASE-12748
>                 URL: https://issues.apache.org/jira/browse/HBASE-12748
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 0.94.25, 0.98.9
>            Reporter: Vladimir Rodionov
>            Assignee: Andrew Purtell
>             Fix For: 2.0.0, 1.3.0, 0.98.15
>
>         Attachments: HBASE-12748.patch, HBASE-12748.patch, HBase-12748.patch
>
>
> This is typical pattern of enhanced for ... loop usage in a hot code path. For every
HBase operation it instantiates iterator for coprocessor list twice. 



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