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https://issues.apache.org/jira/browse/HADOOP-15209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16393356#comment-16393356
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Steve Loughran edited comment on HADOOP-15209 at 3/9/18 6:43 PM:
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Testing: local, s3a, adl, wasb IT tests, command line updates including to an
s3a endpoint running inconsistently.
oh, and I tried FTP. Doesn't work as a dest; never has.
was (Author: [email protected]):
Testing: local, s3a, adl, wasb IT tests, command line updates including to an
s3a endpoint running inconsistently.
> DistCp to eliminate needless deletion of files under already-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, HADOOP-15209-004.patch, HADOOP-15209-005.patch,
> HADOOP-15209-006.patch, HADOOP-15209-007.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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