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From "Jeremiah Jordan (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-13642) Expose recent histograms in JmxHistograms
Date Tue, 22 Aug 2017 00:15:00 GMT


Jeremiah Jordan commented on CASSANDRA-13642:

Looks good to me.  Definitely have written tools based on this behavior in the past.

> Expose recent histograms in JmxHistograms
> -----------------------------------------
>                 Key: CASSANDRA-13642
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Observability
>            Reporter: Chris Lohfink
>            Assignee: Chris Lohfink
> For monitoring tools that were written for the recent*Histograms the current decaying
and all time values exposed by the JmxHistograms is not consumable. We can add a new attribute
(easier with some tooling than operations to read) to expose it just like in storage service
> Should additionally make it so this attribute only stores previous values if read, so
that it does not add any additional memory cost to C* unless used since we already storing
2 versions of histogram for the decaying/alltime views.

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