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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