Oleg Smirnov created KAFKA-7962:
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Summary: StickyAssignor: throws NullPointerException during
assignments if topic is deleted
Key: KAFKA-7962
URL: https://issues.apache.org/jira/browse/KAFKA-7962
Project: Kafka
Issue Type: Bug
Components: consumer
Affects Versions: 2.1.0
Environment: 1. MacOS, com.salesforce.kafka.test.KafkaTestUtils (kind
of embedded kafka integration tests)
2. Linux, dockerised kafka and our service
Reporter: Oleg Smirnov
Attachments: NPE-StickyAssignor-issues.apache.log
Integration tests with com.salesforce.kafka.test.KafkaTestUtils, local setup,
StickyAssignor used, local topics are created / removed, one topic is created
in the beginning of test and without unsubscribing from it - deleted.
Same happens in real environment.
# have single "topic" with 1 partition
# single consumer subscribed to this "topic" (StickyAssignor)
# delete "topic"
=>
* rebalance starts, topic partition(s) is revoked
* on assignment StickyAssignor throws exception (line 223), because
partitionsPerTopic.("topic") returns null in for loop (topic deleted - no
partitions are present)
In the provided log part, tearDown() causes topic deletion, while consumer
still running and tries to poll data from topic.
RangeAssignor works fine (revokes partition, assigns empty set).
Problem doesn't have workaround (like handle i in onPartitionsAssigned and
remove unsubscribe topic), because everything happens before listener called.
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