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Posted to common-issues@hadoop.apache.org by "Tao Jie (JIRA)" <ji...@apache.org> on 2018/10/30 05:56:00 UTC

[jira] [Created] (HADOOP-15887) Add an option to avoid writing data locally in Distcp

Tao Jie created HADOOP-15887:
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             Summary: 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
    Affects Versions: 3.0.0, 2.8.2
            Reporter: Tao Jie
            Assignee: Tao Jie


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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