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From "Mike Drob (JIRA)" <>
Subject [jira] [Resolved] (ACCUMULO-1723) monitor service GET / hangs if Zookeeper down
Date Tue, 22 Apr 2014 20:40:15 GMT


Mike Drob resolved ACCUMULO-1723.

    Resolution: Duplicate

> monitor service GET / hangs if Zookeeper down
> ---------------------------------------------
>                 Key: ACCUMULO-1723
>                 URL:
>             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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