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https://issues.apache.org/jira/browse/KAFKA-13370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17436624#comment-17436624
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Luke Chen commented on KAFKA-13370:
-----------------------------------
Set this issue as blocker for v3.0.1/v3.1.0 since it's a regression issue.
> Offset commit failure percentage metric is not computed correctly (regression)
> ------------------------------------------------------------------------------
>
> Key: KAFKA-13370
> URL: https://issues.apache.org/jira/browse/KAFKA-13370
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect, metrics
> Affects Versions: 2.8.0
> Environment: Confluent Platform Helm Chart (v6.2.0)
> Reporter: Vincent Giroux
> Assignee: Luke Chen
> Priority: Blocker
> Fix For: 3.1.0, 3.0.1
>
>
> There seems to have been a regression in the way the offset-commit-* metrics
> are calculated for *source* Kafka Connect connectors since version 2.8.0.
> Before this version, any timeout or interruption while trying to commit
> offsets for source connectors (e.g. MM2 MirrorSourceConnector) would get
> correctly flagged as an offset commit failure (i.e the
> *offset-commit-failure-percentage* metric ** would be non-zero). Since
> version 2.8.0, these errors are considered as successes.
> After digging through the code, the commit where this bug was introduced
> appears to be this one :
> [https://github.com/apache/kafka/commit/047ad654da7903f3903760b0e6a6a58648ca7715]
> I believe removing the boolean *success* argument in the *recordCommit*
> method of the *WorkerTask* class (argument deemed redundant because of the
> presence of the Throwable *error* argument) and only considering the presence
> of a non-null error to determine if a commit is a success or failure might be
> a mistake. This is because in the *commitOffsets* method of the
> *WorkerSourceTask* class, there are multiple cases where an exception object
> is either not available or is not passed to the *recordCommitFailure* method,
> e.g. :
> * *TImeout #1* :
> [https://github.com/apache/kafka/blob/2.8/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerSourceTask.java#L519]
>
> * *Timeout #2* :
> [https://github.com/apache/kafka/blob/2.8/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerSourceTask.java#L584]
>
> * *Interruption* :
> [https://github.com/apache/kafka/blob/2.8/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerSourceTask.java#L529]
>
> * *Unserializable offset* :
> [https://github.com/apache/kafka/blob/2.8/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerSourceTask.java#L562]
>
>
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