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https://issues.apache.org/jira/browse/HADOOP-17531?focusedWorklogId=570075&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-570075
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ASF GitHub Bot logged work on HADOOP-17531:
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Author: ASF GitHub Bot
Created on: 22/Mar/21 21:52
Start Date: 22/Mar/21 21:52
Worklog Time Spent: 10m
Work Description: steveloughran commented on pull request #2732:
URL: https://github.com/apache/hadoop/pull/2732#issuecomment-804420292
LGTM.
I'm going to make one final change, but +1 this PR pending that change
anyway.
Can you put the CommonCallableSupplier into
`org.apache.hadoop.util.functional` . Sorry, should have thought of this
earlier.
Thats where I'm trying to unify the API for functional APIs in hadoop with
IOE support -and this is clearly part of it.
Nothing else, just a move of the class.
+1 pending that change.
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Issue Time Tracking
-------------------
Worklog Id: (was: 570075)
Time Spent: 6h 40m (was: 6.5h)
> 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: 6h 40m
> 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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