Laurent Goujon created DRILL-5221:
-------------------------------------

             Summary: cancel message is delayed until queryid or data is 
received
                 Key: DRILL-5221
                 URL: https://issues.apache.org/jira/browse/DRILL-5221
             Project: Apache Drill
          Issue Type: Improvement
          Components: Client - C++
    Affects Versions: 1.9.0
            Reporter: Laurent Goujon


When user is calling the cancel method of the C++ client, the client wait for a 
message from the server to reply back with a cancellation message.

In case of queries taking a long time to return their first batch, it means 
cancellation is taking the same amount of time to be effective, instead of 
cancelling right away the query (assuming the query id has already been 
received, which is generally the case).

It seems this was foreseen by [~vkorukanti] in his initial patch 
(https://github.com/vkorukanti/drill/commit/e0ef6349aac48de5828b6d725c2cf013905d18eb)
 but was omitted when I backported it post metadata changes.



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