[jira] [Created] (AMBARI-18331) JMX metric retrieval method may unnecessarily refresh metrics at a high rate

["Jonathan Hurley (JIRA)" <ji...@apache.org>]

Jonathan Hurley created AMBARI-18331:
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             Summary: JMX metric retrieval method may unnecessarily refresh metrics at a high rate
                 Key: AMBARI-18331
                 URL: https://issues.apache.org/jira/browse/AMBARI-18331
             Project: Ambari
          Issue Type: Task
          Components: ambari-server
    Affects Versions: 2.4.0
            Reporter: Jonathan Hurley
            Assignee: Jonathan Hurley
             Fix For: trunk


In AMBARI-16913 we revised the JMX retrieval method to maintain an internal state of JMX metrics, with the retrieval taking place out of band of the actual jetty query requiring the metric.  However, each query will still generate a refresh request to the metric, regardless of it's current state.

Recommend setting a TTL on a given metric such as 5 seconds, and only generate a new request for the metric if a TTL has expired, to avoid large amounts of repeat metrics collections in short windows.



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