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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, 11 Nov 2017 04:07:01 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16248310#comment-16248310
] 

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

patch HBASE-18090-branch-1-v2.patch to build.

> 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
>            Reporter: Mikhail Antonov
>            Assignee: xinxin fan
>             Fix For: 2.0.0-beta-1
>
>         Attachments: HBASE-18090-V3-master.patch, HBASE-18090-V4-master.patch, HBASE-18090-V5-master.patch,
HBASE-18090-branch-1-v2.patch, HBASE-18090-branch-1.3-v1.patch, HBASE-18090-branch-1.3-v2.patch,
HBASE-18090.branch-1.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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