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https://issues.apache.org/jira/browse/IMPALA-10970?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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guojingfeng updated IMPALA-10970:
---------------------------------
Fix Version/s: Impala 4.1.0
> Coordinator only query judgement logic should concern separated join build
> execution
> ------------------------------------------------------------------------------------
>
> Key: IMPALA-10970
> URL: https://issues.apache.org/jira/browse/IMPALA-10970
> Project: IMPALA
> Issue Type: Bug
> Affects Versions: Impala 4.0.0
> Reporter: guojingfeng
> Assignee: guojingfeng
> Priority: Major
> Fix For: Impala 4.1.0
>
>
> IMPALA-8830 introduce the ability of executing trivail queries regardless the
> healthness of executor groups. Coordinatory only query judgment logic
> controls that whether a quer is trivail query or not. It take the query
> ExecRequest and check the plan only contains a single unpartitioned fragment.
> But join builder is scheduled at a separated fragment and colocated with join
> node after IMPALA-4224, in this case a query plan will contain two
> PlenExecInfo. I think *the coorinator only judgment logic should also check
> the jon build side* of the total execution plan.
> Here is a bad case with query option MT_DOP>0:
> {code:java}
> SELECT
> STRAIGHT_JOIN * // Add straight_join hint to disable optimization
> FROM
> ( SELECT '20210831' AS ts
> UNION ALL SELECT '20210901' AS ts
> UNION ALL SELECT '20210902' AS ts
> UNION ALL SELECT '20210903' AS ts ) t1
> CROSS JOIN tpch.lineitem t2
> LIMIT 100;
> {code}
> In debug build this query will fail and got core dump at hit the DECHECK at
> /be/src/scheduling/scheduler.cc#L162
> {code:java}
> DCHECK(executor_config.group.NumExecutors() > 0 || exec_at_coord);
> {code}
> In release build this query will fail with message "Scheduling for executor
> group: empty group
> (using coordinator only) with 0 executors"
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