Philip Zampino created KNOX-2952:
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Summary: Prioritize active nodes in URLs list resulting from CM
discovery
Key: KNOX-2952
URL: https://issues.apache.org/jira/browse/KNOX-2952
Project: Apache Knox
Issue Type: Improvement
Components: Server
Affects Versions: 2.0.0
Reporter: Philip Zampino
Currently, Knox's discovery of service URLs from CM is ignorant about the
"active"-ness of the URLs it discovers.
For WebHDFS for example, Knox blindly consumes the URLs from CM without any
regard for which NameNodes are active. This can result in a stand-by node URL
being first in the list in the resulting topology. While Knox will fail-over to
the active node on the first request, this fail-over is unnecessary and
avoidable.
There are other services for which discovery can be similarly enhanced. Those
should be identified as part of this effort, and as much as possible, support
for this new behavior should be implemented once for as many services as are
affected.
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