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https://issues.apache.org/jira/browse/HADOOP-17531?focusedWorklogId=566496&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-566496
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ASF GitHub Bot logged work on HADOOP-17531:
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Author: ASF GitHub Bot
Created on: 15/Mar/21 19:19
Start Date: 15/Mar/21 19:19
Worklog Time Spent: 10m
Work Description: steveloughran commented on pull request #2732:
URL: https://github.com/apache/hadoop/pull/2732#issuecomment-799686604
> I added a HDFS contract test as well and that fetched me a same exception
as S3A:
The only reason we don't have one of those already is that it slowed down
HDFS test runs and all the other distcp tests used mini HDFS clusters. But we
clearly need it to regression test things
Maybe we should add it, but give it a different name from Test*, (and
comment in the parent class) so that its only run when explicitly asked for.
Some of the S3 tests are like that. Test cases you have to run by hand or from
the IDE -but which maven skips
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Issue Time Tracking
-------------------
Worklog Id: (was: 566496)
Time Spent: 5h (was: 4h 50m)
> 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
> Assignee: Ayush Saxena
> Priority: Critical
> Labels: pull-request-available
> Attachments: MoveToStackIterator.patch, gc-NewD-512M-3.8ML.log
>
> Time Spent: 5h
> Remaining Estimate: 0h
>
> 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(uses queue instead of
> earlier stack), so if you have files at lower depth, it will like open up the
> entire tree and the start processing....
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