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Posted to commits@cassandra.apache.org by "Tyler Hobbs (JIRA)" <ji...@apache.org> on 2014/02/01 02:15:06 UTC
[jira] [Commented] (CASSANDRA-6360) Make nodetool cfhistograms
output easily understandable
[ https://issues.apache.org/jira/browse/CASSANDRA-6360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13888376#comment-13888376 ]
Tyler Hobbs commented on CASSANDRA-6360:
----------------------------------------
I put up a 2.0 version of this here: https://github.com/thobbs/cassandra/tree/CASSANDRA-6360. I'll update this for the new nodetool version after any bike-shedding.
Here's an example output:
{noformat}
~/cassandra $ bin/nodetool cfhistograms Keyspace1 Standard1
Keyspace1/Standard1 histograms
SSTables per Read
1 sstables: 1000
Write Latency (microseconds)
86 us: 5
103 us: 2
124 us: 149
149 us: 391
179 us: 330
215 us: 98
258 us: 8
310 us: 1
372 us: 1
446 us: 0
535 us: 1
642 us: 1
770 us: 1
924 us: 2
1109 us: 4
1331 us: 0
1597 us: 0
1916 us: 0
2299 us: 0
2759 us: 1
3311 us: 4
3973 us: 0
4768 us: 0
5722 us: 0
6866 us: 0
8239 us: 0
9887 us: 1
Read Latency (microseconds)
60 us: 6
72 us: 32
86 us: 160
103 us: 405
124 us: 299
149 us: 52
179 us: 14
215 us: 3
258 us: 5
310 us: 1
372 us: 2
446 us: 2
535 us: 0
642 us: 0
770 us: 2
924 us: 2
1109 us: 1
1331 us: 1
1597 us: 2
1916 us: 2
2299 us: 2
2759 us: 0
3311 us: 2
3973 us: 2
4768 us: 2
5722 us: 0
6866 us: 0
8239 us: 1
Partition Size (bytes)
No Data
Cell Count per Partition
No Data
{noformat}
To summarize:
* We only show the ranges for which we actually have data
* If there's no data, it just says "No Data"
* The old behavior is still available via {{\-c/\-\-compact}}
> Make nodetool cfhistograms output easily understandable
> -------------------------------------------------------
>
> Key: CASSANDRA-6360
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6360
> Project: Cassandra
> Issue Type: Improvement
> Components: Tools
> Reporter: Tyler Hobbs
> Assignee: Tyler Hobbs
> Priority: Trivial
>
> Almost nobody understands the cfhistograms output without googling it. By default, we shouldn't share an axis across all metrics. We can still provide the current format with a --compact option.
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