Ayush Saxena created HADOOP-17531:
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Summary: DistCp: Reduce memory usage on copying huge directories
Key: HADOOP-17531
URL: https://issues.apache.org/jira/browse/HADOOP-17531
Project: Hadoop Common
Issue Type: Improvement
Reporter: Ayush Saxena
Presently distCp, uses the producer-consumer kind of setup while building the
listing, the input queue and output queue are both unbounded, thus the
listStatus grows quite huge.
Rel Code Part :
https://github.com/apache/hadoop/blob/trunk/hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/SimpleCopyListing.java#L635
This goes on bredth-first traversal kind of stuff, so if you have files at
lower depth, it will like open up the entire tree....
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