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https://issues.apache.org/jira/browse/CASSANDRA-21320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18084690#comment-18084690
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Stefan Miklosovic commented on CASSANDRA-21320:
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turnk https://pre-ci.cassandra.apache.org/job/cassandra/577/#showFailuresLink
6.0 https://pre-ci.cassandra.apache.org/job/cassandra-6.0/31/#showFailuresLink
> Track rows written per write request as histogram metric (similar to rows
> read)
> -------------------------------------------------------------------------------
>
> Key: CASSANDRA-21320
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21320
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Observability/Metrics
> Reporter: Piotr Walczak
> Assignee: Stefan Miklosovic
> Priority: Normal
> Fix For: 6.x, 7.x
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Hello team,
> I am planning to make necessary changes to cover below issue:
> Problem:
> Currently, Cassandra provides histogram metrics for reads to show rows
> scanned per read request (e.g., rows_per_read - using liveScannedHistogram).
> However, there is no equivalent metric on the write side that tracks rows
> written per write request at the table level.
> Solution
> Add a new histogram metric rowsMutatedPerWriteHistogram that:
> 1. Tracks the total number of rows mutated in each write request at the table
> level
> 2. Is recorded once per write request
> 3. Provides equivalent visibility into write patterns as rows_per_read does
> for read patterns
> Use Case
> Operations teams can now analyze write patterns alongside read patterns:
>
> Code changes proposal:
> [https://github.com/apache/cassandra/compare/trunk...pwalczak:cassandra:pwalczak/CASSANDRA-21320/trunk?expand=1]
> 1. What's the typical size of write requests (in terms of rows)?
> 2. How does write request size distribution compare across tables?
> 3. Identify unusually large batch writes that may impact performance
> 4. Monitor trends in write request patterns over time
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