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https://issues.apache.org/jira/browse/HBASE-6372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13444661#comment-13444661
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Jonathan Hsieh commented on HBASE-6372:
---------------------------------------

I had some outstanding issues about the test modification (it didn't test the 
feature).  Since this is closed, can we file a follow on issue to fix the test 
and to report on the improvement it provided?
                
> Add scanner batching to Export job
> ----------------------------------
>
>                 Key: HBASE-6372
>                 URL: https://issues.apache.org/jira/browse/HBASE-6372
>             Project: HBase
>          Issue Type: Improvement
>          Components: mapreduce
>    Affects Versions: 0.96.0, 0.94.2
>            Reporter: Lars George
>            Assignee: Shengsheng Huang
>            Priority: Minor
>              Labels: newbie
>             Fix For: 0.96.0
>
>         Attachments: HBASE-6372.2.patch, HBASE-6372.3.patch, 
> HBASE-6372.4.patch, HBASE-6372.5.patch, HBASE-6372.patch
>
>
> When a single row is too large for the RS heap then an OOME can take out the 
> entire RS. Setting scanner batching in custom scans helps avoiding this 
> scenario, but for the supplied Export job this is not set.
> Similar to HBASE-3421 we can set the batching to a low number - or if needed 
> make it a command line option.

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