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From "Jason Dere (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-17482) External LLAP client: acquire locks for tables queried directly by LLAP
Date Thu, 07 Sep 2017 23:17:00 GMT
Jason Dere created HIVE-17482:
---------------------------------

             Summary: External LLAP client: acquire locks for tables queried directly by LLAP
                 Key: HIVE-17482
                 URL: https://issues.apache.org/jira/browse/HIVE-17482
             Project: Hive
          Issue Type: Sub-task
          Components: llap
            Reporter: Jason Dere
            Assignee: Jason Dere


When using the LLAP external client with simple queries (filter/project of single table),
the appropriate locks should be taken on the table being read like they are for normal Hive
queries. This is important in the case of transactional tables being queried, since the compactor
relies on the presence of table locks to determine whether it can safely delete old versions
of compacted files without affecting currently running queries.

This does not have to happen in the complex query case, since a query is used (with the appropriate
locking mechanisms) to create/populate the temp table holding the results to the complex query.



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