Victoria Xia created KAFKA-14864:
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Summary: Memory leak in KStreamWindowAggregate with
ON_WINDOW_CLOSE emit strategy
Key: KAFKA-14864
URL: https://issues.apache.org/jira/browse/KAFKA-14864
Project: Kafka
Issue Type: Bug
Components: streams
Reporter: Victoria Xia
Assignee: Victoria Xia
Fix For: 3.5.0
The Streams DSL processor implementation for the ON_WINDOW_CLOSE emit strategy
during KStream windowed aggregations opens a key-value iterator but does not
call `close()` on it
([link|https://github.com/apache/kafka/blob/5afedd9ac37c4d740f47867cfd31eaed15dc542f/streams/src/main/java/org/apache/kafka/streams/kstream/internals/AbstractKStreamTimeWindowAggregateProcessor.java#L203]),
despite the Javadocs for the iterator making clear that users must do so in
order to release resources
([link|https://github.com/apache/kafka/blob/5afedd9ac37c4d740f47867cfd31eaed15dc542f/streams/src/main/java/org/apache/kafka/streams/state/KeyValueIterator.java#L27]).
I discovered this bug while running load testing benchmarks and noticed that
some runs were sporadically hitting OOMs, so it is definitely possible to hit
this in practice.
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