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From "Marcus Eriksson (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-11420) Add the JMX metrics to track the write amplification of C*
Date Tue, 29 Mar 2016 07:19:25 GMT


Marcus Eriksson updated CASSANDRA-11420:
       Resolution: Fixed
    Fix Version/s:     (was: 3.x)
           Status: Resolved  (was: Patch Available)

thanks, committed with a small change (used {{createTableCounter}} to get the global counts)

> Add the JMX metrics to track the write amplification of C*
> ----------------------------------------------------------
>                 Key: CASSANDRA-11420
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Dikang Gu
>            Assignee: Dikang Gu
>            Priority: Minor
>             Fix For: 3.6
>         Attachments: 0001-Add-the-metrics-to-track-the-write-amplification-of-.patch
> 2016-03-24_02:30:38.39936 INFO  02:30:38 Completed flushing /data/cassandra/data/keyspace/column-family/column-family-tmp-ka-295782-Data.db
(73.266MiB) for commitlog position ReplayPosition(segmentId=1458717183630, position=3690)
> It would be useful to expose the number of flushed bytes to JMX, so that we can monitor
how many bytes are written by application and flushed to disk.
> I also expose the number of bytes written by compaction to JMX, so the WA can be calculated
by dividing these two metrics

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