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Posted to dev@hive.apache.org by "Sergey Shelukhin (JIRA)" <ji...@apache.org> on 2017/06/29 17:35:00 UTC

[jira] [Created] (HIVE-16992) LLAP: better default lambda for LRFU policy

Sergey Shelukhin created HIVE-16992:
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             Summary: LLAP: better default lambda for LRFU policy
                 Key: HIVE-16992
                 URL: https://issues.apache.org/jira/browse/HIVE-16992
             Project: Hive
          Issue Type: Bug
            Reporter: Sergey Shelukhin


LRFU is currently skewed heavily towards LRU; there are 10k-s or 100k-s of buffers tracked during a typical workload, but the heap size is around 700. We should see if making it closer to LFU (by tweaking the lambda) will improve hit rate with small queries infrequently interleaved with large scans; and whether it will have negative effects due to perf overhead.



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