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https://issues.apache.org/jira/browse/KAFKA-12485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17716307#comment-17716307
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Manyanda Chitimbo commented on KAFKA-12485:
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Hi [~ableegoldman] I am current looking at this and I've a question regarding
this part
> We should consider optimizing these APIs to just return the cached offsets in
> place of the remote call when passed in only partitions that are currently
> owned.
The requirement to return cached offset is that all partitions in the arg of
Consumer#committed have to be owned or that we returned a cached offset for any
partition in that list that's current owned, if a partition is not owned we
fetch it via a remote call. I am taking the later approach but I'd like to
confirm this with you. What do you think?
> Speed up Consumer#committed by returning cached offsets for owned partitions
> ----------------------------------------------------------------------------
>
> Key: KAFKA-12485
> URL: https://issues.apache.org/jira/browse/KAFKA-12485
> Project: Kafka
> Issue Type: Improvement
> Components: consumer
> Reporter: A. Sophie Blee-Goldman
> Assignee: Manyanda Chitimbo
> Priority: Major
> Labels: newbie++
>
> All of the KafkaConsumer#committed APIs will currently make a remote blocking
> call to the server to fetch the committed offsets. This is typically used to
> reset the offsets after a crash or restart, or to fetch offsets for other
> consumers in the group. However some users may wish to invoke this API on
> partitions which are currently owned by the Consumer, in which case the
> remote call is unnecessary since it should be able to just keep track of what
> it has itself committed.
> We should consider optimizing these APIs to just return the cached offsets in
> place of the remote call when passed in only partitions that are currently
> owned. This is similar to what we do in Consumer#position, although there we
> have a guarantee that the partitions are owned by the Consumer whereas in
> #committed we do not
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