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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-1723) monitor service GET / hangs if Zookeeper down
Date Thu, 19 Sep 2013 11:35:51 GMT
Steve Loughran created ACCUMULO-1723:
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             Summary: monitor service GET / hangs if Zookeeper down
                 Key: ACCUMULO-1723
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1723
             Project: Accumulo
          Issue Type: Bug
          Components: monitor
    Affects Versions: 1.6.0
         Environment: small pseudo-cluster where the single-node ZK has been shut down
            Reporter: Steve Loughran
            Priority: Minor


Once ZK is offline, you can't issue GET (or POST or HEAD, but not PUT) requests against URLs
on the monitors web port. The requests just hang. Invalid HTTP requests get rejected by Jetty,
so the process itself is running, it's just whatever servlet is fielding requests is blocking
without timeouts waiting for ZK, or for a lock to be released by some other thread that is
blocked on ZK.

While a ZK outage is not something you'd plan for in a real cluster, it is the kind of thing
you'd hope the monitor to pick up and explicit highlight as a problem -especially if the page
is being fetched by a machine process rather than an individual

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