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From "Zhijie Shen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-2520) Scalable and High Available Timeline Server
Date Mon, 08 Sep 2014 06:09:28 GMT
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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