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From ctubbsii <...@git.apache.org>
Subject [GitHub] accumulo issue #242: ACCUMULO-2181/3005 REST API and new Monitor UI
Date Wed, 24 May 2017 17:34:23 GMT
Github user ctubbsii commented on the issue:

    https://github.com/apache/accumulo/pull/242
  
    To be clear, the registration that @joshelser describes has not changed. What has changed
is that the standby serves the REST API and views instead of displaying a message that it
does not have the lock, while it is waiting for the lock.
    
    The sole purpose of the lock for the monitor is to support automatic forwarding to one,
and only one, monitor with the out-of-box log configuration. Otherwise, the service registration
would be a list instead of a singleton lock.
    
    @lstav and I discussed the possibility of adding a message to the log view only (instead
of all pages) similar to the old message, so that a user won't be confused why no logs are
showing up when they visit a standby monitor. That would only matter for the log view, because
that's the only functionality that would differ between the active and standby monitors. However,
I'm not sure whether or not that's the right thing to do, because a user may wish to configure
a log appender to forward logs to all monitors, and such a message would only apply to our
custom monitor appender, which discriminates in favor of the active monitor for log forwarding.
    
    To summarize: the test should still check that HTTP is serving before acquiring the lock.
However, the text of what it is looking for in the standby monitor may have changed. We could
add a simple REST endpoint for the monitor to report its own status... and that could contain
things like: active or standby, listening ports, listening interfaces, last master contact
time, etc. That would make it easier to verify that the HTTP service is working, even when
the lock has not yet been acquired.


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