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https://issues.apache.org/jira/browse/KAFKA-13135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17387028#comment-17387028
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David Mao commented on KAFKA-13135:
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Taking a closer look, I think we can also optimize this for the happy path.
appendForGroup passes in the groupLock which gets locked during the entire
putCacheCallback when completing the DelayedProduce from appending offset
messages.
We already lock the groupLock inside of the callback when reading group state,
so we may be able to avoid passing in the groupLock, and achieve some finer
grained locking. I need to take a look at storeGroup to see if the groupLock is
necessary there.
> Reduce GroupMetadata lock contention for offset commit requests
> ---------------------------------------------------------------
>
> Key: KAFKA-13135
> URL: https://issues.apache.org/jira/browse/KAFKA-13135
> Project: Kafka
> Issue Type: Improvement
> Reporter: David Mao
> Priority: Major
>
> as suggested by [~lbradstreet], we can look for similar optimizations to
> https://issues.apache.org/jira/browse/KAFKA-13134 in the offset commit path.
> It looks like there are some straightforward optimizations possible for the
> error path.
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