Yiqun Lin created HDFS-13573:

             Summary: Javadoc for BlockPlacementPolicyDefault is inaccurate
                 Key: HDFS-13573
                 URL: https://issues.apache.org/jira/browse/HDFS-13573
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 3.1.0
            Reporter: Yiqun Lin

Current rule of default block placement:
The replica placement strategy is that if the writer is on a datanode,
the 1st replica is placed on the local machine,
otherwise a random datanode. The 2nd replica is placed on a datanode
that is on a different rack. The 3rd replica is placed on a datanode
which is on a different node of the rack as the second replica.

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