[jira] [Created] (IMPALA-6101) DataStreamMgr::Cancel() should take a query ID instead of a finst ID

["Sailesh Mukil (JIRA)" <ji...@apache.org>]

Sailesh Mukil created IMPALA-6101:
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             Summary: DataStreamMgr::Cancel() should take a query ID instead of a finst ID
                 Key: IMPALA-6101
                 URL: https://issues.apache.org/jira/browse/IMPALA-6101
             Project: IMPALA
          Issue Type: Improvement
          Components: Distributed Exec
    Affects Versions: Impala 2.10.0
            Reporter: Sailesh Mukil


Currently our DataStreamMgr class is a singleton class, which means it has a holistic view of all fragment instances running on a given impalad node.

We currently call DataStreamMgr::Cancel() per fragment instance, which means on every Cancel() call, we do a O(N) lookup through a receiver map maintained by the DataStreamMgr, even though we know that if one fragment instance belonging to a query is cancelled, all other fragment instances belonging to that query will be cancelled as well.

Instead, if we take a query ID, we can cancel all fragment instances belonging to that query at once, with a single O(N) lookup of the receiver map.



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