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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-3958) Monitor.fetchData should check for null instance name
Date Tue, 11 Aug 2015 19:25:45 GMT
Josh Elser created ACCUMULO-3958:
------------------------------------

             Summary: Monitor.fetchData should check for null instance name
                 Key: ACCUMULO-3958
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3958
             Project: Accumulo
          Issue Type: Improvement
          Components: monitor
            Reporter: Josh Elser
            Assignee: Josh Elser
            Priority: Minor
             Fix For: 1.6.4, 1.7.1, 1.8.0


Had an odd situation where the monitor would throw an NPE constantly when I tried to view
any page.

It was throwing a NPE trying to accessed the cached instance name. It appears that {{HdfsZooInstance.getInstance().getInstanceName(}}
may return null, but the monitor code is not written to account for that.

The monitor should check for null values before setting the instance name into {{cachedInstanceName}}.
When the instance name is null, it should reschedule the timertask to try to fetch a (non-null)
instance name.



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