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https://issues.apache.org/jira/browse/HDDS-17656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDDS-17656:
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Labels: pull-request-available short-circuit-read (was: short-circuit-read)
> One short-circuit GetBlock increments NumOps twice
> --------------------------------------------------
>
> Key: HDDS-17656
> URL: https://issues.apache.org/jira/browse/HDDS-17656
> Project: Apache Ozone
> Issue Type: Bug
> Reporter: Elavarasan Kathirvel
> Assignee: Gargi Jaiswal
> Priority: Minor
> Labels: pull-request-available, short-circuit-read
>
> A short-circuit read of one block is counted twice in the datanode total
> operation count. The block-read counters stay correct.
> ||Counter in the datanode metrics||Expected increase for one read||Actual
> increase||
> |Total operation count ({{{}NumOps{}}})|1|2|
> |GetBlock count ({{{}numGetBlock{}}})|1|1|
> |Local GetBlock count ({{{}numLocalGetBlock{}}})|1|1|
>
> {*}Steps to reproduce{*}:
> # Write a 10 MB key and get the replica on that datanode.
> # Read {{{}NumOps{}}}, {{{}numGetBlock{}}}, and {{numLocalGetBlock}} from
> {{{}http://<datanode>:9882/jmx?qry=Hadoop:service=HddsDatanode,name=StorageContainerMetrics{}}}.
> # Read the key with {{{}ozone sh key get <volume>/<bucket>/<key>
> /tmp/out{}}}.
> # Read the same three counters again.
> Expected: All three counters increase by 1.
> Actual: {{NumOps}} increases by 2. {{numGetBlock}} and {{numLocalGetBlock}}
> increase by 1.
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