[jira] [Commented] (HBASE-6372) Add scanner batching to Export job

["Shengsheng Huang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-6372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427791#comment-13427791 ] 

Shengsheng Huang commented on HBASE-6372:
-----------------------------------------

{quote}
-1 core tests. The patch failed these unit tests:
org.apache.hadoop.hbase.regionserver.TestAtomicOperation
{quote}
This unit test passed at my local deployment. And I don't think the patch has anything to do with this unit test. 
Could somebody kindly help confirm why the unit test fail in Hadoop QA?
Thanks very much. 
                
> 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
>         Attachments: HBASE-6372.2.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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