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Posted to common-issues@hadoop.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/03/02 07:32:00 UTC
[jira] [Work logged] (HADOOP-17531) DistCp: Reduce memory usage on
copying huge directories
[ https://issues.apache.org/jira/browse/HADOOP-17531?focusedWorklogId=559838&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-559838 ]
ASF GitHub Bot logged work on HADOOP-17531:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 02/Mar/21 07:31
Start Date: 02/Mar/21 07:31
Worklog Time Spent: 10m
Work Description: ayushtkn opened a new pull request #2732:
URL: https://github.com/apache/hadoop/pull/2732
https://issues.apache.org/jira/browse/HADOOP-17531
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Issue Time Tracking
-------------------
Worklog Id: (was: 559838)
Remaining Estimate: 0h
Time Spent: 10m
> 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
> Priority: Critical
> Attachments: MoveToStackIterator.patch, gc-NewD-512M-3.8ML.log
>
> Time Spent: 10m
> 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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