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https://issues.apache.org/jira/browse/KAFKA-15824?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mayank Shekhar Narula resolved KAFKA-15824.
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Resolution: Fixed
> SubscriptionState's maybeValidatePositionForCurrentLeader should handle
> partition which isn't subscribed yet
> ------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-15824
> URL: https://issues.apache.org/jira/browse/KAFKA-15824
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Reporter: Mayank Shekhar Narula
> Assignee: Mayank Shekhar Narula
> Priority: Major
> Fix For: 3.7.0
>
>
> As can be seen [here|#L453], maybeValidatePositionForCurrentLeader doesn't
> check if partition is subscribed by checking TopicPartitionState cached is
> null or not, as done by
> [maybeCompleteValidation|[http://example.com|https://github.com/apache/kafka/blob/832627fc78484fdc7c8d6da8a2d20e7691dbf882/clients/src/main/java/org/apache/kafka/clients/consumer/internals/SubscriptionState.java#L477]].
> So it throws IllegalStateException for a partition that is yet not
> subscribed.
> Lack of this check writing thread-safe code w.r.t SubscriptionState class is
> awkward. This can be seen from the example code below. For example, at line 1
> partitionA would be in allCurrentlySubscribedTopics, but at line 2 it could
> be removed from subscribed partitions(in a separate thread). So this forces
> the user of this class to handle IllegalStateException which is awkward.
> {code:java}
> // Following is example code for the user of
> SubscriptionState::maybeValidatePositionForCurrentLeader
> Set<TopicPartition> allCurrentlySubscribedTopics =
> subscriptionState.assignedPartitions(); // line 1
> if(allCurrentlySubscribedTopics.contains(tp)) {
> ConsumerMetadata.LeaderAndEpoch leaderAndEpoch =
> metadata.currentLeader(tp);
> try() {
> subscriptionState.maybeValidatePositionForCurrentLeader(apiVersions, tp,
> leaderAndEpoch); // line 2
> } catch (IllegalStateException e) {
> // recover from it. // line 3
> }
> }{code}
>
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