A tracking URL of N/A before the app master is launched breaks oozie
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Key: MAPREDUCE-3387
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3387
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mrv2
Affects Versions: 0.23.0, 0.24.0
Reporter: Robert Joseph Evans
Priority: Critical
When oozie launches a map/reduce job it retrieves the tracking URL of that job
to display in its own UI. Previously this tracking URL did not change except
when the job completed. Currently the URL starts out as N/A and then changes
to the real URL once the AppMaster launches. This breaks oozie, as oozie
expects to be able to get that information quickly and get back to processing
other requests.
Because the web app proxy is now available we can maintain backwards
compatibility by instead of returning N/A we can return the URL of the proxy
for that application. This relies on the fact that the application master's UI
will display the correct thing for the URI http://<host>:<port>/, which MR and
others now do.
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