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Type:
Sub-task
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Status: Resolved
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Priority:
Major
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Resolution: Fixed
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Affects Version/s: HA branch (HDFS-1623)
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Fix Version/s: HA branch (HDFS-1623)
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Labels:None
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Target Version/s:
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Hadoop Flags:Reviewed
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.