When unable to place replicas, BlockPlacementPolicy should log reasons nodes
were excluded
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Key: HDFS-1332
URL: https://issues.apache.org/jira/browse/HDFS-1332
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Reporter: Todd Lipcon
Priority: Minor
Whenever the block placement policy determines that a node is not a "good
target" it could add the reason for exclusion to a list, and then when we log
"Not able to place enough replicas" we could say why each node was refused.
This would help new users who are having issues on pseudo-distributed (eg
because their data dir is on /tmp and /tmp is full). Right now it's very
difficult to figure out the issue.
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