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https://issues.apache.org/jira/browse/HADOOP-15209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16400911#comment-16400911
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Hudson commented on HADOOP-15209:
---------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #13845 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/13845/])
HADOOP-15209. DistCp to eliminate needless deletion of files under (stevel: rev
1976e0066e9ae8852715fa69d8aea3769330e933)
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/contract/s3a/ITestS3AContractDistCp.java
* (add)
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/mapred/DeletedDirTracker.java
* (edit)
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/ContractTestUtils.java
* (edit)
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/mapred/CopyCommitter.java
* (edit)
hadoop-tools/hadoop-distcp/src/test/java/org/apache/hadoop/tools/util/TestDistCpUtils.java
* (edit)
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/OptionsParser.java
* (add)
hadoop-tools/hadoop-distcp/src/test/java/org/apache/hadoop/tools/contract/TestLocalContractDistCp.java
* (edit)
hadoop-tools/hadoop-distcp/src/test/java/org/apache/hadoop/tools/mapred/TestCopyCommitter.java
* (edit)
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/util/DistCpUtils.java
* (edit) hadoop-tools/hadoop-distcp/src/test/resources/log4j.properties
* (add) hadoop-tools/hadoop-distcp/src/test/resources/contract/localfs.xml
* (edit)
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCpOptionSwitch.java
* (edit) hadoop-tools/hadoop-azure-datalake/pom.xml
* (add)
hadoop-tools/hadoop-distcp/src/test/java/org/apache/hadoop/tools/mapred/TestDeletedDirTracker.java
* (add)
hadoop-tools/hadoop-azure-datalake/src/test/java/org/apache/hadoop/fs/adl/live/TestAdlContractDistCpLive.java
* (edit)
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCpOptions.java
* (edit)
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/CopyListing.java
* (edit)
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCpConstants.java
* (edit)
hadoop-tools/hadoop-distcp/src/test/java/org/apache/hadoop/tools/contract/AbstractContractDistCpTest.java
* (edit)
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/CopyListingFileStatus.java
> 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
> Fix For: 3.1.0
>
> 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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