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From "xinxin fan (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-18090) Improve TableSnapshotInputFormat to allow more multiple mappers per region
Date Fri, 08 Sep 2017 11:21:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16158394#comment-16158394
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xinxin fan edited comment on HBASE-18090 at 9/8/17 11:20 AM:
-------------------------------------------------------------

patch v2 for review


was (Author: xinxin fan):
patch v2 for review

> 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
>
>
> 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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