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  1. Hive
  2. HIVE-22102

Reduce HMS call when creating HiveSession

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Details

    • Improvement
    • Status: Resolved
    • Trivial
    • Resolution: Fixed
    • None
    • 4.0.0
    • HiveServer2
    • None

    Description

      When establishing HiveSession, it ends up configuring session variables/settings.

      As part of it, it ends up checking the database details. https://github.com/apache/hive/blob/master/service/src/java/org/apache/hive/service/cli/session/HiveSessionImpl.java#L314

      Even if it is `default` DB, it ends up making this check. In corner cases, these calls turn out to be expensive.

      2019-08-13T03:16:57,189  INFO [b42ba57f-1740-4174-855d-4e3f08319ca5 HiveServer2-Handler-Pool: Thread-1552313] metadata.Hive: Total time spent in this metastore function was greater than 1000ms : getDatabase_(String, )=13265
      

      We can just skip this check if its `DEFAULT_DATABASE_NAME` (default) DB. This may not be an issue for CachedStore.

      Attachments

        1. HIVE-22102.1.patch
          1 kB
          Rajesh Balamohan

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            rajesh.balamohan Rajesh Balamohan
            rajesh.balamohan Rajesh Balamohan
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            Dates

              Created:
              Updated:
              Resolved: