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https://issues.apache.org/jira/browse/HDDS-16725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18126939#comment-18126939
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Gargi Jaiswal commented on HDDS-16725:
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No requirement of failure metrics.
> SCR failure metric from design doc is not implemented
> -----------------------------------------------------
>
> Key: HDDS-16725
> URL: https://issues.apache.org/jira/browse/HDDS-16725
> Project: Apache Ozone
> Issue Type: Bug
> Components: Ozone Datanode
> Reporter: Elavarasan Kathirvel
> Assignee: Gargi Jaiswal
> Priority: Major
> Labels: short-circuit-read
>
> As per the HDDS-10685 design document
> ({{{}hadoop-hdds/docs/content/design/short-circuit-read.md{}}}),
> Short-Circuit Read (SCR) should expose metrics for:
> * bytes read through SCR
> * successful SCR read count
> * failed SCR read count
> The current implementation only partially delivers this. The failure metric
> is not implemented.
>
> Short-Circuit Read (SCR) failures are not captured in any datanode or client
> metric. When SCR fails, the read typically falls back to gRPC and succeeds,
> but there is no way to monitor or validate SCR failure rate through
> JMX/metrics.
>
> *Expected Behavior:*
> * SCR success count, failure count, and bytes read should all be available
> in metrics.
> *Actual Behavior:*
> * Failure metric is missing. SCR failures are visible only in logs.
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