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Posted to jira@kafka.apache.org by "Richard Yu (JIRA)" <ji...@apache.org> on 2019/03/01 03:40:00 UTC

[jira] [Created] (KAFKA-8020) Consider making ThreadCache a time-aware LRU Cache

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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