[jira] [Created] (KNOX-1153) Dynamic HaProvider Configuration for Generated Topologies

["Phil Zampino (JIRA)" <ji...@apache.org>]

Phil Zampino created KNOX-1153:
----------------------------------

             Summary: Dynamic HaProvider Configuration for Generated Topologies
                 Key: KNOX-1153
                 URL: https://issues.apache.org/jira/browse/KNOX-1153
             Project: Apache Knox
          Issue Type: Bug
          Components: Server
    Affects Versions: 0.14.0
            Reporter: Phil Zampino
            Assignee: Phil Zampino
             Fix For: 0.15.0


With the ability to share provider configuration across multiple topologies, it would be good if the service-specific HA Provider configuration could be pushed down into the service elements themselves, possibly with more generic (i.e., global) configuration specified at the provider level.

For instance, rather than


{code:java}
  <provider>
    <role>ha</role>
    <name>HaProvider</name>
    <enabled>true</enabled>
      <param name="HIVE" value="maxFailoverAttempts=3;failoverSleep=1000;enabled=true;zookeeperEnsemble=c6801.ambari.apache.org:2181,c6802.ambari.apache.org:2181,c6803.ambari.apache.org:2181;zookeeperNamespace=hiveserver2" />
  </provider>
</gateway>
...
<service>
  <role>HIVE</role>
</service>
{code}


The HIVE param value would become service-level params:

{code:java}
<service>
  <role>HIVE</role>
  <param name="ha" value="true"/>
  <param name="maxFailoverAttempts" value="3"/>"
  <param name="failoverSleep" value="1000"/>"
  <param name="zookeeperEnsemble" value="machine1:2181,machine2:2181,machine3:2181"/>
  <param name="zookeeperNamespace" value="hiveserver2"/>
</service>

{code}

This has the potential to increase the share-ability of provider configurations. It also makes more sense for the service-specific details to be co-located with the services themselves.

It should be possible to determine whether or not HA is configured for a service, in which case, topology generation could use the cluster discovery information to automatically configure Knox to interact with the HA-enabled service.




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