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https://issues.apache.org/jira/browse/KAFKA-8020?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Richard Yu updated KAFKA-8020:
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Description: In distributed systems, time-aware LRU Caches offers a
superior eviction policy better than traditional LRU models, having more cache
hits than misses. In this new policy, if an item is stored beyond its useful
lifespan, then it is removed. For example, in {{CachingWindowStore}}, a window
usually is of limited 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. (was: In distributed systems, time-aware LRU
Caches offers a superior eviction policy better than traditional LRU models,
having more cache hits than misses. In this new policy, if an item which is
stored beyond its useful lifespan, then it is removed. For example, in
{{CachingWindowStore}}, a window usually is of limited 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.)
> 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
> Priority: Major
>
> In distributed systems, time-aware LRU Caches offers a superior eviction
> policy better than traditional LRU models, having more cache hits than
> misses. In this new policy, if an item is stored beyond its useful lifespan,
> then it is removed. For example, in {{CachingWindowStore}}, a window usually
> is of limited 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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