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From "Mikhail Antonov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18090) Improve TableSnapshotInputFormat to allow more multiple mappers per region
Date Fri, 15 Sep 2017 15:07:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16167984#comment-16167984
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Mikhail Antonov commented on HBASE-18090:
-----------------------------------------

Looks good to me! The only thing that would be good to do is probably to add some tests for
the new methods in the RegionSplitter and the SplitAlgos.

That looks actually backward compatible and self-contained enough that it can go to branch-1
(cc [~apurtell]). I'd consider it for 1.3.2 port  - I think risk-benefit ratio is good.

[~ghelmling] [~ashu210890] you may be interested too.

> 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
>            Assignee: xinxin fan
>         Attachments: HBASE-18090-branch-1.3-v1.patch, HBASE-18090-branch-1.3-v2.patch,
HBASE-18090-V3-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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