Sergey Shelukhin created HBASE-22410:
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Summary: add the notion of the expected # of servers and report a
metric as an alternative to dead server metric for non-fixed server sets
Key: HBASE-22410
URL: https://issues.apache.org/jira/browse/HBASE-22410
Project: HBase
Issue Type: Improvement
Components: Operability
Reporter: Sergey Shelukhin
dead servers appear to only be cleaned up when a server comes up on the same
host and port; however, if HBase is running on smth like YARN with many more
hosts than RSes, RS may come up on a different server and the dead one will
never be cleaned.
The metric should be improved to account for that... it will potentially
require configuring master with expected number of region servers, so that the
metric could be output based on that.
Dead server list should also be expired based on timestamp in such cases.
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