Zhijie Shen created YARN-2520:

             Summary: Scalable and High Available Timeline Server
                 Key: YARN-2520
                 URL: https://issues.apache.org/jira/browse/YARN-2520
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: timelineserver
    Affects Versions: 2.5.0, 3.0.0
            Reporter: Zhijie Shen
            Assignee: Zhijie Shen

YARN-2032 will provide a scalable and reliable timeline store based on HBase. 
However a single instance of the timeline server is not scalable enough to 
handle a large volume of user requests, being the single bottleneck.

As the timeline server is the stateless machine, it's not difficult to start 
multiple timeline server instances and write into the same HBase timeline 
store. We can make use of Zookeeper to register all the timeline servers, as HA 
RMs do, and client can randomly pick one server to publish the timeline 
entities for load balancing.

Moreover, since multiple timeline servers are started together, they are 
actually back up each other, solving the high availability problem as well.

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