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https://issues.apache.org/jira/browse/HADOOP-15887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16668865#comment-16668865
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Steve Loughran commented on HADOOP-15887:
-----------------------------------------
Makes sense.
* needs documentation
* needs a test to verify that distcp will actually write data with locality
disabled. Ideally some test in the existing distcp tests can be enhanced for
this, a new test case added, etc. I don't see a mini HDFS cluster letting you
verify that locality is being disabled, but we should check that the switch
does not break things.
* And a test in AbstractContractDistCpTest so that we can verify that it
doesn't break the other filesystems.
> Add an option to avoid writing data locally in Distcp
> -----------------------------------------------------
>
> Key: HADOOP-15887
> URL: https://issues.apache.org/jira/browse/HADOOP-15887
> Project: Hadoop Common
> Issue Type: Improvement
> Components: tools/distcp
> Affects Versions: 2.8.2, 3.0.0
> Reporter: Tao Jie
> Assignee: Tao Jie
> Priority: Major
> Attachments: HADOOP-15887.001.patch
>
>
> When copying large amount of data from one cluster to another via Distcp, and
> the Distcp jobs run in the target cluster, the datanode local usage would be
> imbalanced. Because the default placement policy chooses the local node to
> store the first replication.
> In https://issues.apache.org/jira/browse/HDFS-3702 we add a flag in DFSClient
> to avoid replicating to the local datanode. We can make use of this flag in
> Distcp.
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