[improve][meta] Add byte size limit to AbstractMetadataStore's childrenCache #24868
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nodece
approved these changes
Oct 21, 2025
Technoboy-
reviewed
Oct 22, 2025
pulsar-metadata/src/main/java/org/apache/pulsar/metadata/impl/AbstractMetadataStore.java
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Technoboy-
approved these changes
Oct 22, 2025
…hildren-cache-limit
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Motivation
AbstractMetadataStore contains an unbounded childrenCache which might consume a lot of heap memory when a lot of namespaces with a lot of topics are listed. The cache has a timeout of 10 minutes so the memory usage problem is limited to certain use cases. For example, when all topics are listed for all namespaces in less than 10 minutes when there are a lot of namespaces and topics.
Modifications
Add a limit to the childrenCache so that oldest entries start to get expired when the cache consumes more than 20% of the maximum heap size.
Tests are TBD.
Documentation
docdoc-requireddoc-not-neededdoc-complete