Sean Busbey created ACCUMULO-4557:
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Summary: 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: 1.8.0, 1.7.2, 1.7.1
Reporter: Sean Busbey
Priority: Critical
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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