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From "Aleksey Yeschenko (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-8662) Switch cfhistograms from using yammer metrics in 2.1
Date Wed, 21 Jan 2015 19:12:35 GMT


Aleksey Yeschenko commented on CASSANDRA-8662:

Would love to, but not sure if we can do it without breaking backward compatibility in a minor
release (looking at pluggable metrics reporting breakage).

Also, it's a reasonable amount of codes, probably too much for a 2.1 minor :(

> Switch cfhistograms from using yammer metrics in 2.1
> ----------------------------------------------------
>                 Key: CASSANDRA-8662
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Chris Lohfink
>            Assignee: Chris Lohfink
>             Fix For: 2.1.3
>         Attachments: CASSANDRA-8662v1.txt
> cfhistograms was changed to use the yammer histograms CASSANDRA-5871.  Until CASSANDRA-5657's
change to metrics we shouldn't represent the yammer histogram for latency metrics.  Yammer's
histogram is based on assumption of a normal distribution and is bad at representing the tail
percentiles with skewed distributions.  So revert the change just in the 2.1 branch but leave
it for 3.0.

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