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Posted to commits@cassandra.apache.org by "Ariel Weisberg (JIRA)" <ji...@apache.org> on 2018/11/28 22:17:00 UTC
[jira] [Commented] (CASSANDRA-11939) Make Read and Write Latency
columns are consistent for proxyhistograms and cfhistograms
[ https://issues.apache.org/jira/browse/CASSANDRA-11939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16702433#comment-16702433 ]
Ariel Weisberg commented on CASSANDRA-11939:
--------------------------------------------
[Trunk comparison|https://github.com/apache/cassandra/compare/trunk...aweisberg:11939-trunk?expand=1], [CircleCI|https://circleci.com/gh/aweisberg/cassandra/tree/11939-trunk].
Just waiting on the dtests to make sure nothing was parsing the output. I am only going to commit this to trunk since it is a breaking change for anyone relying on it.
> Make Read and Write Latency columns are consistent for proxyhistograms and cfhistograms
> ---------------------------------------------------------------------------------------
>
> Key: CASSANDRA-11939
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11939
> Project: Cassandra
> Issue Type: Bug
> Components: Tools
> Reporter: J.B. Langston
> Assignee: Amanda R Debrot
> Priority: Minor
> Labels: lhf
> Attachments: 11939-2.2.txt, 11939-2.2.txt, 11939-3.0.txt, 11939-3.0.txt, 11939-3.11.txt, 11939-3.11.txt, 11939-output.txt, 11939-trunk.txt, 11939-trunk.txt
>
>
> It’s triggering my ocd that read and write latency columns are swapped in proxyhistograms vs cfhistograms. I guess the argument against changing it now is that it could screw with some peoples scripts or expectations, but it does make it hard to eyeball when you’re trying to compare local latencies vs coordinator latencies.
> {code}
> Percentile SSTables Write Latency Read Latency Partition Size Cell Count
> (micros) (micros) (bytes)
> 50% 4.00 17.00 770.00 8239 4
> 75% 5.00 24.00 924.00 17084 17
> 95% 5.00 35.00 61214.00 51012 24
> 98% 6.00 35.00 126934.00 105778 24
> 99% 6.00 72.00 152321.00 152321 35
> Min 0.00 9.00 36.00 21 0
> Max 6.00 86.00 263210.00 20924300 1109
> Percentile Read Latency Write Latency Range Latency
> (micros) (micros) (micros)
> 50% 1331.00 535.00 11864.00
> 75% 17084.00 642.00 20501.00
> 95% 219342.00 1331.00 20501.00
> 98% 315852.00 2759.00 20501.00
> 99% 379022.00 3311.00 20501.00
> Min 373.00 73.00 9888.00
> Max 379022.00 9887.00 20501.00
> {code}
> Ideally read and write latencies should be in the same order and the first and second columns on both so they’re directly aligned. The sstables column should be moved to the 3rd column to make way.
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