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Posted to issues-all@impala.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2018/09/06 02:33:00 UTC

[jira] [Created] (IMPALA-7541) Avoid instantiating metrics for IncompleteTables

Todd Lipcon created IMPALA-7541:
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             Summary: Avoid instantiating metrics for IncompleteTables
                 Key: IMPALA-7541
                 URL: https://issues.apache.org/jira/browse/IMPALA-7541
             Project: IMPALA
          Issue Type: Bug
          Components: Catalog
            Reporter: Todd Lipcon


Currently we instantiate a Metrics object for every table. However in many cases, users have hundreds of thousands or millions of tables and only a small subset are loaded. This is even more likely after the new automatic invalidation work in progress. So, we should try to minimize memory footprint of IncompleteTable. The largest culprit there seems to be the new Metrics object added by IMPALA-4886. We should lazily init this only on *loaded* tables.



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