Add HA-related metrics
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Key: HDFS-2510
URL: https://issues.apache.org/jira/browse/HDFS-2510
Project: Hadoop HDFS
Issue Type: Sub-task
Components: data-node, name-node
Affects Versions: HA branch (HDFS-1623)
Reporter: Aaron T. Myers
Assignee: Aaron T. Myers
Off the top of my head, I can think of:
NN metrics:
* A binary metric for active or standby
* The size of the pending DN message queues
* A timestamp for when the standby NN last read from shared edit log
* The difference between highest generation stamp seen from the shared edit log
and the highest generation stamp seen from any DN
It would probably also be useful to have a DN metric which somehow describes
which active/standby NNs its talking to, e.g. "times since last communicated
with standby/active NNs."
I'm sure there are others as well. Comments strongly encouraged.
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