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From "xinxin fan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18090) Improve TableSnapshotInputFormat to allow more multiple mappers per region
Date Sat, 30 Sep 2017 05:53:03 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16186909#comment-16186909
] 

xinxin fan commented on HBASE-18090:
------------------------------------

Yes, I will provide patch for branch1 ASAP

> 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: 3.0.0
>            Reporter: Mikhail Antonov
>            Assignee: xinxin fan
>             Fix For: 3.0.0, 2.0.0-alpha-4
>
>         Attachments: HBASE-18090-branch-1.3-v1.patch, HBASE-18090-branch-1.3-v2.patch,
HBASE-18090-V3-master.patch, HBASE-18090-V4-master.patch, HBASE-18090-V5-master.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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