Admission control slots are meant to be ignored for queries that utilize the default pool and empty executor group. This feature was implemented by IMPALA-13024 ( https://github.com/apache/impala/commit/29e418679380591ea7b8e4bdb797ccdbb0964a3d ).
Impala executor should be running with 1 admission slot (-admission_control_slots=1 flag) for this example: *— Setup* *set request_pool=default;* *drop table if exists testtable purge;* *— Running a long query to occupy the slot * *SELECT SLEEP(999999);* *— Admission control slot is expected to be ignored by this query* *create table testtable stored as parquet as select 1;* *— Actual result* *Not enough admission control slots available on host ip:port. Needed 1 slots but 1/1 are already in use.* Judging by a test case for IMPALA-13024, the default resource pool should be defined in this specific way: https://github.com/apache/impala/blob/29e418679380591ea7b8e4bdb797ccdbb0964a3d/tests/custom_cluster/test_executor_groups.py#L76 Otherwise it won't trigger this condition: state.request_pool() == RequestPoolService::DEFAULT_POOL_NAME <https://github.com/apache/impala/commit/29e418679380591ea7b8e4bdb797ccdbb0964a3d?diff=unified&w=0#diff-512a4171d424439d8f2432d4e22b6deb34b17e51ecaa84063d609b5ad0f116d2R1010> How can it be achieved via fair-scheduler.xml configuration?
