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Posted to issues@activemq.apache.org by "Francesco Nigro (Jira)" <ji...@apache.org> on 2021/01/04 11:04:00 UTC

[jira] [Created] (ARTEMIS-3049) Reduce live page lookup cost

Francesco Nigro created ARTEMIS-3049:
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             Summary: Reduce live page lookup cost
                 Key: ARTEMIS-3049
                 URL: https://issues.apache.org/jira/browse/ARTEMIS-3049
             Project: ActiveMQ Artemis
          Issue Type: Improvement
          Components: Broker
    Affects Versions: 2.16.0
            Reporter: Francesco Nigro
            Assignee: Francesco Nigro


LivePageCacheImpl::getMessage is performing a linked-list-like lookup that can be rather slow if compared to a O(1) lookup on ArrayList-like data structure. 
it's possible to speed it up by:
# using a last accessed buffer cache on the append only chunked list used on LivePageCacheImpl, to speedup nearest accesses (very likely to happen with a single consumer)
# using an array with the any fresh reloaded paged messages, in case of cache reload



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