DN should transmit absolute failed volume count rather than increments to the NN
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Key: HDFS-1850
URL: https://issues.apache.org/jira/browse/HDFS-1850
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node, name-node
Reporter: Eli Collins
Assignee: Eli Collins
Fix For: 0.23.0
The API added in HDFS-811 for the DN to report volume failures to the NN is
"inc(DN)". However the given sequence of events will result in the NN
forgetting about reported failed volumes:
# DN loses a volume and reports it
# NN restarts
# DN re-registers to the new NN
A more robust interface would be to have the DN report the total number of
volume failures to the NN each heart beat (the same way other volume state is
transmitted).
This will likely be an incompatible change since it requires changing the
Datanode protocol.
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