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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1698) nodetool cfhistograms
Date Mon, 15 Nov 2010 12:50:15 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932045#action_12932045
] 

Jonathan Ellis commented on CASSANDRA-1698:
-------------------------------------------

you should follow the pattern in NodeProbe of
{code}
    public JMXInstrumentedCacheMBean getRowCacheMBean(String tableName, String cfName)
{code}

to grab exactly the requested CFSMbean instead of listing all and iterating.

histogram does not show bucket offsets.

tabs are not going to be adequate to align large numbers.

> nodetool cfhistograms
> ---------------------
>
>                 Key: CASSANDRA-1698
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1698
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Tools
>            Reporter: Jonathan Ellis
>            Assignee: Pavel Yaskevich
>             Fix For: 0.6.9
>
>         Attachments: CASSANDRA-1698-for-0.6.patch
>
>
> we need a nodetool command that outputs columnfamilystore RecentReadLatencyHistogramMicros,
RecentReadLatencyHistogramMicros, and (for 0.7) getRecentReadLatencyHistogramMicros.
> i'd like this to be in a vertical display with the histogram bucket values from EstimatedHistogram
displayed.  Like this:
> {code}
> 1               0
> 15              1        
> 18            542        
> 22           8091        
> 79         198290        
> 114         47248        
> 850           114        
> 1020           37
> etc
> {code}

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