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From "Yi Liang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18090) Improve TableSnapshotInputFormat to allow more multiple mappers per region
Date Thu, 25 May 2017 22:54:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16025515#comment-16025515
] 

Yi Liang commented on HBASE-18090:
----------------------------------

ok, so if user know the size of region, they can considering split it into a reasonable number.
Cool,   i will review the code today and tomorrow. 

> Improve TableSnapshotInputFormat to allow more multiple mappers per region
> --------------------------------------------------------------------------
>
>                 Key: HBASE-18090
>                 URL: https://issues.apache.org/jira/browse/HBASE-18090
>             Project: HBase
>          Issue Type: Improvement
>          Components: mapreduce
>    Affects Versions: 1.4.0
>            Reporter: Mikhail Antonov
>         Attachments: HBASE-18090-branch-1.3-v1.patch
>
>
> TableSnapshotInputFormat runs one map task per region in the table snapshot. This places
unnecessary restriction that the region layout of the original table needs to take the processing
resources available to MR job into consideration. Allowing to run multiple mappers per region
(assuming reasonably even key distribution) would be useful.



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