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https://issues.apache.org/jira/browse/HADOOP-15209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16371468#comment-16371468
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Steve Loughran commented on HADOOP-15209:
-----------------------------------------
checkstyles aren't going to be things I can/will address:
{code}
./hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/OptionsParser.java:84:
public static DistCpOptions parse(String[] args):3: Method length is 156
lines (max allowed is 150). [MethodLength]
./hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/mapred/DeletedDirTracker.java:0::
Missing package-info.java file. [JavadocPackage]
{code}
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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