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Posted to common-issues@hadoop.apache.org by "Ayush Saxena (Jira)" <ji...@apache.org> on 2021/02/16 13:05:00 UTC

[jira] [Created] (HADOOP-17531) DistCp: Reduce memory usage on copying huge directories

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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