Abin Shahab created HDFS-8511:
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Summary: Nodegroup locality does not pick the right data-local
node for writes
Key: HDFS-8511
URL: https://issues.apache.org/jira/browse/HDFS-8511
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Abin Shahab
Priority: Critical
Setting up Nodegroup locality destroys data-local writes if NM and DN have
separate ip addresses.
When NM requests Namenode for 3 DN locations to write to(for replication=3),
the Namenode returns a random order every time.
The reason is, Namenode wrongly assumes that it's list of DN's must include the
NM's ip address. This assumption breaks down when you deploy NM and DN on
separate machines/ip addresses.
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