distcp can generate uneven map task assignments
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Key: MAPREDUCE-1059
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1059
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: distcp
Reporter: Aaron Kimball
Assignee: Aaron Kimball
Attachments: MAPREDUCE-1059.patch
distcp writes out a SequenceFile containing the source files to transfer, and their sizes.
Map tasks are created over spans of this file, representing files which each mapper should
transfer. In practice, some transfer loads yield many empty map tasks and a few tasks perform
the bulk of the work.
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