Yiqun Lin created HDFS-13573:
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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:
{quote}
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.
{quote}
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