SkewJoin should report progress while writing skew keys to HDFS
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Key: HIVE-2641
URL: https://issues.apache.org/jira/browse/HIVE-2641
Project: Hive
Issue Type: Improvement
Reporter: Namit Jain
RowContainer.copyToDFSDirectory is used to write the skew keys to HDFS. But
this can take a long time, and while it is happening, the MR framework does not
see progress from the reducer. The code should do the copy in smaller unit and
report progress to the MR framework
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