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https://issues.apache.org/jira/browse/CASSANDRA-11420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15215549#comment-15215549
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Dikang Gu commented on CASSANDRA-11420:
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[~krummas] the 0002-expose-the-bytes-written-by-compaction-to-JMX-as-wel.patch
is based on 2.1, I can make a patch based on truck shortly.
> Add the JMX metrics to track the write amplification of C*
> ----------------------------------------------------------
>
> Key: CASSANDRA-11420
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11420
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Dikang Gu
> Assignee: Dikang Gu
> Priority: Minor
> Fix For: 3.x
>
> Attachments:
> 0001-Add-the-metrics-of-how-many-bytes-we-flushed-from-me.patch,
> 0002-expose-the-bytes-written-by-compaction-to-JMX-as-wel.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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