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Posted to issues@impala.apache.org by "Tim Armstrong (JIRA)" <ji...@apache.org> on 2018/01/31 00:14:00 UTC

[jira] [Created] (IMPALA-6460) More flexible memory-based admission control policies

Tim Armstrong created IMPALA-6460:
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             Summary: More flexible memory-based admission control policies
                 Key: IMPALA-6460
                 URL: https://issues.apache.org/jira/browse/IMPALA-6460
             Project: IMPALA
          Issue Type: Improvement
          Components: Distributed Exec
    Affects Versions: Impala 2.11.0
            Reporter: Tim Armstrong
            Assignee: Tim Armstrong


Currently there are only two ways to decided how much memory to reserve for each query in memory-based admission control:
* Using the memory estimates, which often makes bad decisions (e.g. huge overestimates) and doesn't have any enforcement on the backend
* Using a static pool or user-set mem_limit, which is very difficult to set to a reasonable value for all queries.

The memory reservation work will allow us to come up with more powerful and flexible polices



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