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https://issues.apache.org/jira/browse/KAFKA-19521?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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travis resolved KAFKA-19521.
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Reviewer: Lucas Brutschy
Resolution: Fixed
> Fix consumption and leaving group when source topic is deleted
> --------------------------------------------------------------
>
> Key: KAFKA-19521
> URL: https://issues.apache.org/jira/browse/KAFKA-19521
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: travis
> Assignee: travis
> Priority: Major
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> h2. Issue Description
> In the integration test `HandlingSourceTopicDeletionIntegrationTest`, we
> observe significant differences in application exit time between old and new
> protocols when source topic is deleted: * Old Protocol: ~10 seconds
> * New Protocol: ~100 seconds
> h2. Observed Behavior
> # State Transition Discrepancy:
> ## One stream transitions to ERROR state quickly
> ## Another stream remains in PENDING_ERROR state for an extended period
> # Critical Log Evidence:
> **
> {code:java}
> Leader for partition inputTopic-0 is unknown for fetching offset -1 Building
> ListOffsets request for partitions {inputTopic-0=-1}{code}
> {code:java}
> Consumer attempted to leave the group but couldn't complete it within 30000
> ms. It will proceed to close.{code}
> # Timing Analysis:
> *
> ** 60s: AsyncConsumer continues attempting to consume while leader is unknown
> ** 30s: Failed attempts to leave consumer group
> ** Total: ~100s vs ~10s in old protocol
> h2. Root Cause Analysis
> # Extended Polling Phase (60s):
> ** AsyncConsumer continues polling despite unknown leader
> ** No early termination mechanism when topic is deleted
> ** Waits for full timeout before shutdown
> # Group Leave Issues (30s):
> ** New protocol struggles with group leave operation
> ** Requires full timeout before forced close
> ** Potential coordination issues in new protocol implementation
> h2. Related Code
> *
> {noformat}
> HandlingSourceTopicDeletionIntegrationTest{noformat}
> * AsyncConsumer implementation
> * New protocol group management code
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