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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15209) DistCp to eliminate needless deletion of files under deleted directories
Date Wed, 21 Feb 2018 14:20:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16371468#comment-16371468

Steve Loughran commented on HADOOP-15209:

checkstyles aren't going to be things I can/will address: 
 public static DistCpOptions parse(String[] args):3: Method length is 156 lines (max allowed
is 150). [MethodLength]
Missing package-info.java file. [JavadocPackage]

Reviews welcome at this point. [~sanjay.radia], included

> DistCp to eliminate needless deletion of files under deleted directories
> ------------------------------------------------------------------------
>                 Key: HADOOP-15209
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15209
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: tools/distcp
>    Affects Versions: 2.9.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>         Attachments: HADOOP-15209-001.patch, HADOOP-15209-002.patch, HADOOP-15209-003.patch
> DistCP issues a delete(file) request even if is underneath an already deleted directory.
This generates needless load on filesystems/object stores, and, if the store throttles delete,
can dramatically slow down the delete operation.
> If the distcp delete operation can build a history of deleted directories, then it will
know when it does not need to issue those deletes.
> Care is needed here to make sure that whatever structure is created does not overload
the heap of the process.

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