[jira] [Created] (IMPALA-7031) Detailed failure reason for clients when a query is cancelled from the WebUi

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

Adriano created IMPALA-7031:
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             Summary: Detailed failure reason for clients when a query is cancelled from the WebUi
                 Key: IMPALA-7031
                 URL: https://issues.apache.org/jira/browse/IMPALA-7031
             Project: IMPALA
          Issue Type: New Feature
            Reporter: Adriano


In big clusters with many jdbc/odbc users, in order to save resources are often implemented scripts that automatically cancel queries (e.g. long running queries) (the scripts typically are using the Impala Webui).

Typical Scenario:
 # A jdbc/odbc client submit a query
 # The Coordinator start the query execution
 # The query is cancelled from the Coordinator WebUi
 # The jdbc/odbc client ask to the Coordinator the query status (GetOperationStatus)
 # The Coordinator answer "unknown query ID" (as the query was cancelled)
 # For the client perspective the query failed for "unknown query ID"

Currently, if a running query is cancelled from the impalad WebUI, the client will just receive an 'unknown query ID' error on the next fetch/getOperationStatus attempt. It would be good to be able to explicitly call out this case.



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