Richard Yu created KAFKA-8020:
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Summary: Consider making ThreadCache a time-aware LRU Cache
Key: KAFKA-8020
URL: https://issues.apache.org/jira/browse/KAFKA-8020
Project: Kafka
Issue Type: Improvement
Components: streams
Reporter: Richard Yu
Currently, in Kafka Streams, ThreadCache is used to store
{{InternalProcessorContext}}s. Typically, these entries apply for only a
limited time span. For example, in {{CachingWindowStore}}, a window is of fixed
size. After it expires, it would no longer be queried for, but it potentially
could stay in the ThreadCache for an unnecessary amount of time if it is not
evicted (i.e. the number of entries being inserted is few). For better
allocation of memory, it would be better if we implement a time-aware LRU Cache
which takes into account the lifespan of an entry and removes it once it has
expired.
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