A down DataNode makes Balancer to hang on repeatingly asking NameNode its
partial block list
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Key: HDFS-742
URL: https://issues.apache.org/jira/browse/HDFS-742
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Hairong Kuang
Assignee: Hairong Kuang
We had a balancer that had not made any progress for a long time. It turned out
it was repeatingly asking Namenode for a partial block list of one datanode,
which was done while the balancer was running.
NameNode should notify Balancer that the datanode is not available and Balancer
should stop asking for the datanode's block list.
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