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Posted to issues@impala.apache.org by "Joe McDonnell (Jira)" <ji...@apache.org> on 2021/07/16 18:50:00 UTC

[jira] [Created] (IMPALA-10803) Switch default data cache eviction policy to LIRS

Joe McDonnell created IMPALA-10803:
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             Summary: Switch default data cache eviction policy to LIRS
                 Key: IMPALA-10803
                 URL: https://issues.apache.org/jira/browse/IMPALA-10803
             Project: IMPALA
          Issue Type: Improvement
          Components: Backend
    Affects Versions: Impala 4.1
            Reporter: Joe McDonnell
            Assignee: Joe McDonnell


The data cache currently defaults to using LRU for the cache eviction policy. In IMPALA-8690, we added support for LIRS, a scan resistant eviction policy. This is now stable, and we should switch to using LIRS by default. It is likely to have better performance characteristics than LRU for most workloads.



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