Expose status of DNs from the NN programmatically
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Key: HDFS-2997
URL: https://issues.apache.org/jira/browse/HDFS-2997
Project: Hadoop HDFS
Issue Type: New Feature
Components: name-node
Affects Versions: 0.23.1
Reporter: Aaron T. Myers
Users who would like monitor the NN's view of DN health currently have two
options: either parse the NN web UI, or call the (private API)
DFSClient#datanodeReport. We should expose this in a nicer way, e.g. through
metrics.
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