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https://issues.apache.org/jira/browse/IMPALA-7031?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on IMPALA-7031 started by Alice Fan.
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> Debug page "Cancel" action actually unregisters query
> -----------------------------------------------------
>
> Key: IMPALA-7031
> URL: https://issues.apache.org/jira/browse/IMPALA-7031
> Project: IMPALA
> Issue Type: New Feature
> Components: Distributed Exec
> Affects Versions: Impala 3.0
> Reporter: Adriano
> Assignee: Alice Fan
> Priority: Major
> Labels: query-lifecycle
> Attachments: Screen Shot 2018-07-20 at 10.19.42.png
>
>
> 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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