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https://issues.apache.org/jira/browse/IMPALA-8096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16763104#comment-16763104
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ASF subversion and git services commented on IMPALA-8096:
---------------------------------------------------------
Commit 6601327af6088def7d880940a5712719fe46acb2 in impala's branch
refs/heads/master from poojanilangekar
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=6601327 ]
IMPALA-8096: Add rows produced limit per query
This patch limits the number of rows produced by a query by
tracking it at the PlanRootSink level. When the
NUM_ROWS_PRODUCED_LIMIT is set, it cancels a query when its
execution produces more rows than the specified limit. This limit
only applies when the results are returned to a client, e.g. for a
SELECT query, but not an INSERT query.
Testing:
Added tests to query-resource-limits.test to verify that the rows
produced limit is honored.
Manually tested on various combinations of tables, fileformats
and ROWS_RETURNED_LIMIT values.
Change-Id: I7b22dbe130a368f4be1f3662a559eb9aae7f0c1d
Reviewed-on: http://gerrit.cloudera.org:8080/12328
Reviewed-by: Tim Armstrong <tarmstr...@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
> Limit on #rows returned from query
> ----------------------------------
>
> Key: IMPALA-8096
> URL: https://issues.apache.org/jira/browse/IMPALA-8096
> Project: IMPALA
> Issue Type: Sub-task
> Components: Backend
> Reporter: Tim Armstrong
> Assignee: Pooja Nilangekar
> Priority: Major
> Labels: resource-management
>
> Sometimes users accidentally run queries that return a large number of rows,
> e.g.
> {code}
> SELECT * FROM table
> {code}
> When they really only need to look at a subset of the rows. It would be
> useful to have a guardrail to fail queries the return more rows than a
> particular limit. Maybe it would make sense to integrate with IMPALA-4268 so
> that the query is failed when the buffer fills up, but it may also be useful
> to have an easier-to-understand option based on #rows.
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