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Posted to commits@cassandra.apache.org by "Yifan Cai (Jira)" <ji...@apache.org> on 2021/11/15 23:45:00 UTC
[jira] [Updated] (CASSANDRA-17155) Increase the buckets count for timer histogram
[ https://issues.apache.org/jira/browse/CASSANDRA-17155?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Yifan Cai updated CASSANDRA-17155:
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Bug Category: Parent values: Code(13163)Level 1 values: Bug - Unclear Impact(13164)
Complexity: Low Hanging Fruit
Discovered By: User Report
Severity: Low
Status: Open (was: Triage Needed)
> Increase the buckets count for timer histogram
> ----------------------------------------------
>
> Key: CASSANDRA-17155
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17155
> Project: Cassandra
> Issue Type: Bug
> Components: Observability/Metrics
> Reporter: Yifan Cai
> Assignee: Yifan Cai
> Priority: Normal
>
> EstimatedHistograms used in timers are allocated with 90 buckets, as part of CASSANDRA-16760. It can represent the highest value of 25 seconds. The setting is not free from hitting overflow error when calculating the mean value from the histogram. We can increase the buckets count to 128 to increase the upper limit to 25,628 seconds, which just covers the range of 165 buckets prior CASSANDRA-16760.
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