Stanislav Chizhov created KAFKA-5985:
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Summary: Mention the need to close store iterators
Key: KAFKA-5985
URL: https://issues.apache.org/jira/browse/KAFKA-5985
Project: Kafka
Issue Type: Improvement
Components: documentation
Affects Versions: 0.11.0.0
Reporter: Stanislav Chizhov
Store iterators should be closed in all/most of the cases, but currently it is
not consistently reflected in the documentation and javadocs. For instance
https://kafka.apache.org/0110/documentation/streams/developer-guide#streams_developer-guide_interactive-queries_custom-stores
does not mention the need to close an iterator and provide and example that
does not do that.
Some of the fetch methods do mention the need to close an iterator returned
(e.g.
https://kafka.apache.org/0110/javadoc/org/apache/kafka/streams/state/ReadOnlyKeyValueStore.html#range(K,%20K)),
but others do not:
https://kafka.apache.org/0110/javadoc/org/apache/kafka/streams/state/ReadOnlyWindowStore.html#fetch(K,%20long,%20long)
It makes sense to:
- update javadoc for all store methods that do return iterators to reflect that
the iterator returned needs to be closed
- mention it in the documentation and to update related examples.
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