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https://issues.apache.org/jira/browse/KAFKA-10060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17118992#comment-17118992
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Ismael Juma commented on KAFKA-10060:
-------------------------------------
Thanks for the JIRA. I think the expired offsets one can be removed if there
are no offsets to expire. Others require careful analysis. Some of them could
be useful when analyzing group rebalancing behavior.
> Kafka is logging too verbosely at the INFO level
> ------------------------------------------------
>
> Key: KAFKA-10060
> URL: https://issues.apache.org/jira/browse/KAFKA-10060
> Project: Kafka
> Issue Type: Bug
> Components: logging
> Affects Versions: 2.1.0
> Reporter: Greg Hamilton
> Priority: Major
>
> Some of the INFO level log4j entries are quite verbose and not really useful,
> for example in kafka.coordinator.group.GroupMetadataManager, the following
> log can be constantly printed with 0 expired offsets:
>
> {code:java}
> info(s"Removed $numOffsetsRemoved expired offsets in ${time.milliseconds() -
> currentTimestamp} milliseconds."){code}
>
>
> *Other examples include:*
> kafka.coordinator.group.GroupMetadataManager.GroupCoordinator:
>
> {code:java}
> info(s"Group ${group.groupId} with generation ${group.generationId} is now
> empty " +
> s"(${Topic.GROUP_METADATA_TOPIC_NAME}-${partitionFor(group.groupId)})")
> {code}
> {code:java}
> info(s"Preparing to rebalance group ${group.groupId} in state
> ${group.currentState} with old generation " + s"${group.generationId}
> (${Topic.GROUP_METADATA_TOPIC_NAME}-${partitionFor(group.groupId)}) (reason:
> $reason)")
> {code}
> {code:java}
> info(s"Assignment received from leader for group ${group.groupId} for
> generation ${group.generationId}")
> {code}
> {code:java}
> info(s"Stabilized group ${group.groupId} generation ${group.generationId} " +
> s"(${Topic.GROUP_METADATA_TOPIC_NAME}-${partitionFor(group.groupId)})")
> {code}
>
>
> We should move them to DEBUG if they are expected in normal state.
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