stack created HBASE-21320:
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Summary: [canary] Cleanup of usage and add commentary
Key: HBASE-21320
URL: https://issues.apache.org/jira/browse/HBASE-21320
Project: HBase
Issue Type: Bug
Components: canary
Reporter: stack
Assignee: stack
Fix For: 2.2.0, 2.1.1, 2.0.3
I was trying to us the Canary as a diagnosis tool figuring what was online and
what was off but I couldn't make sense of how to use it. There was a bug where
we default to regionserver 'mode' always and only way to change it was via a
system property and a cryptic class name.
Changed it so we don't specify output ahead of figuring what 'mode' we are to
run in. Cleaned-up usage and added commentary. It seems useable now (Did not
change command-line args though they need changing).
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