[jira] [Created] (CASSANDRA-20547) Report Cassandra server pauses as metrics using jHiccup-like logic

["Dmitry Konstantinov (Jira)" <ji...@apache.org>]

Dmitry Konstantinov created CASSANDRA-20547:
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             Summary: Report Cassandra server pauses as metrics using jHiccup-like logic
                 Key: CASSANDRA-20547
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-20547
             Project: Apache Cassandra
          Issue Type: New Feature
            Reporter: Dmitry Konstantinov
            Assignee: Dmitry Konstantinov


During a latency issues investigation it is useful to see when JVM is paused by some reasons. There are JVM JMX metrics for GC but GC is not only the reason for pauses, it can be due to too high CPU, noisy neighbour, VM movement, VM over-provisioning, safepoints, etc.  

https://github.com/giltene/jHiccup agent suggest a way to measure it. The agent itself does not provide JMX metrics but we can repeat the same idea in our code, it is a simple idea: run a thread which regularly go to sleep for a configured time interval and then we compare the actual sleep time vs real time: https://github.com/giltene/jHiccup/blob/master/src/main/java/org/jhiccup/HiccupMeter.java#L484



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