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https://issues.apache.org/jira/browse/ACCUMULO-4557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Christopher Tubbs updated ACCUMULO-4557:
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Fix Version/s: 2.0.0
1.8.1
1.7.3
> Instance API should state when returning null is expected.
> ----------------------------------------------------------
>
> Key: ACCUMULO-4557
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4557
> Project: Accumulo
> Issue Type: Bug
> Components: client
> Affects Versions: 1.7.1, 1.7.2, 1.8.0
> Reporter: Sean Busbey
> Priority: Critical
> Fix For: 1.7.3, 1.8.1, 2.0.0
>
>
> This is an issue at least in 1.6.0+. Ran into during ACCUMULO-4556.
> In that case the TablesServlet is making use of Instance to get root tablet
> location information via the Instance interface. The API for
> {{getRootTablet}} in master is:
> {code}
> /**
> * Returns the location of the tablet server that is serving the root
> tablet.
> *
> * @return location in "hostname:port" form
> */
> String getRootTabletLocation();
> {code}
> When the root tablet is offline, all of our current implementations return
> {{null}}. The data structure used in TablesServlet can't handle nulls, so the
> code fails with an NPE.
> We should review the current implementations for Instance and update the API
> to include details on the circumstances where a {{null}} will be returned
> from all of the defined methods.
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