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https://issues.apache.org/jira/browse/HBASE-18090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16269628#comment-16269628
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stack commented on HBASE-18090:
-------------------------------
Pushed to branch-1.3, branch-1.4 (FYI [~apurtell]), and branch-1. Won't push to
branch-1.2 unless you do up a new patch [~xinxin fan] (no harm if you don't do
one). Thanks for the nice feature.
> 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: 1.4.0, 1.3.2, 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-v2.patch,
> HBASE-18090-branch-1.3-v1.patch, HBASE-18090-branch-1.3-v2.patch,
> HBASE-18090.branch-1.3.001.patch, HBASE-18090.branch-1.3.001.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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