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https://issues.apache.org/jira/browse/HBASE-18090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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xinxin fan updated HBASE-18090:
-------------------------------
Description:
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.
was:
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.
With this feature, client can specify the desired num of mappers when init
table snapshot mapper job：
{code}
TableMapReduceUtil.initTableSnapshotMapperJob(snapshotName,)
{code}
> 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-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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