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Posted to commits@cassandra.apache.org by "Dmitry Konstantinov (Jira)" <ji...@apache.org> on 2026/04/11 12:19:00 UTC
[jira] [Updated] (CASSANDRA-21300) LiveScannedHistogram metric actually reports live rows but docs say live cells
[ https://issues.apache.org/jira/browse/CASSANDRA-21300?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dmitry Konstantinov updated CASSANDRA-21300:
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Summary: LiveScannedHistogram metric actually reports live rows but docs say live cells (was: Clarification about LiveScannedHistogram metric)
> LiveScannedHistogram metric actually reports live rows but docs say live cells
> ------------------------------------------------------------------------------
>
> Key: CASSANDRA-21300
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21300
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Documentation
> Reporter: Piotr Walczak
> Priority: Normal
>
> Hello team,
> I was browsing the documentation ([https://cassandra.apache.org/doc/trunk/cassandra/managing/operating/metrics.html]) around the metric LiveScannedHistogram (Histogram of live cells scanned in queries on this table.) - and looking at the source code - [https://github.com/apache/cassandra/blob/cassandra-4.1/src/java/org/apache/cassandra/db/ReadCommand.java#L546#L588] - the LiveScannedHistogram metric - returns the number of rows retrieved per read query- while documentation says it returns the number of cells which were scanned.
>
> Having that said - would you be able to confirm my understanding and if so - do you think we should update documentation?
> Thanks,
> Piotrek
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