Junping Du created HADOOP-9045:
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Summary: In nodegroup-aware case, make sure nodes are avoided to
place replica if some replica are already under the same nodegroup
Key: HADOOP-9045
URL: https://issues.apache.org/jira/browse/HADOOP-9045
Project: Hadoop Common
Issue Type: Bug
Components: fs
Affects Versions: 2.0.2-alpha
Reporter: Junping Du
In previous implementation for HADOOP-8468, 3rd replica is avoid to place on
the same nodegroup of 2nd replica. But it didn't provide check on nodegroup of
1st replica, so if 2nd replica's rack is not efficient to place replica, then
it is possible to place 3rd and 1st replica within the same node group. We need
a change to remove all nodes from available nodes for placing replica if there
already replica on the same nodegroup.
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