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From "Mikhail Antonov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-18090) Improve TableSnapshotInputFormat to allow more multiple mappers per region
Date Mon, 22 May 2017 18:17:04 GMT
Mikhail Antonov created HBASE-18090:
---------------------------------------

             Summary: 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


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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