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Posted to commits@cassandra.apache.org by "Chris Lohfink (JIRA)" <ji...@apache.org> on 2016/01/06 20:43:39 UTC

[jira] [Created] (CASSANDRA-10975) Histogram buckets exposed in jmx are sorted by count

Chris Lohfink created CASSANDRA-10975:
-----------------------------------------

             Summary: Histogram buckets exposed in jmx are sorted by count
                 Key: CASSANDRA-10975
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10975
             Project: Cassandra
          Issue Type: Bug
          Components: Observability
            Reporter: Chris Lohfink


The estimated histogram snapshot lets its parent provide the getValues implementation which sorts the bucket array:
https://github.com/dropwizard/metrics/blob/3.1-maintenance/metrics-core/src/main/java/com/codahale/metrics/UniformSnapshot.java#L25

making it hard to determine what count belonged to what bucket. Along with removal of the pre 2.2 deprecated metrics this makes it nearly impossible to track latencies over time.



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