hadoop cp should generate a better number of map tasks
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Key: HADOOP-229
URL: http://issues.apache.org/jira/browse/HADOOP-229
Project: Hadoop
Type: Bug
Components: fs
Reporter: Yoram Arnon
Assigned to: Milind Bhandarkar
Priority: Minor
hadoop cp currently assigns 10 files to copy per map task.
in case of a small number of large files on a large cluster (say 300 files of
30GB each on a 300 node cluster), this results in long execution times.
better would be to assign files per task such that the entire cluster is
utilized: one file per map, with a cap of 10000 maps total, so as not to over
burden the job tracker.
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