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https://issues.apache.org/jira/browse/IMPALA-13024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17839337#comment-17839337
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Csaba Ringhofer commented on IMPALA-13024:
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>Slot based admission is not enabled when using default groups
This was also my assumption, but it seems that it is enforced by default.
Reproduced slot starvation locally:
Run one query with more fragment instance than core count in one impala-shell:
set mt_dop=32;
select sleep(1000*60) from tpcds.store_sales limit 200; --
Run a query in another impala-shell:
select * from functional.alltypestiny;
ERROR: Admission for query exceeded timeout 60000ms in pool default-pool.
Queued reason: Not enough admission control slots available on host
csringhofer-7000-ubuntu:27000. Needed 1 slots but 32/24 are already in use.
Additional Details: Not Applicable
> Several tests timeout waiting for admission
> -------------------------------------------
>
> Key: IMPALA-13024
> URL: https://issues.apache.org/jira/browse/IMPALA-13024
> Project: IMPALA
> Issue Type: Bug
> Reporter: Csaba Ringhofer
> Priority: Critical
>
> A bunch of seemingly unrelated tests failed with the following message:
> Example:
> query_test.test_spilling.TestSpillingDebugActionDimensions.test_spilling_aggs[protocol:
> beeswax | exec_option: {'mt_dop': 1, 'debug_action': None,
> 'default_spillable_buffer_size': '256k'} | table_format: parquet/none]
> {code}
> ImpalaBeeswaxException: E Query aborted:Admission for query exceeded
> timeout 60000ms in pool default-pool. Queued reason: Not enough admission
> control slots available on host ... . Needed 1 slots but 18/16 are already in
> use. Additional Details: Not Applicable
> {code}
> This happened in an ASAN build. Another test also failed which may be related
> to the cause:
> custom_cluster.test_admission_controller.TestAdmissionController.test_queue_reasons_slots
>
> {code}
> Timeout: query 'e1410add778cd7b0:c40812b900000000' did not reach one of the
> expected states [4], last known state 5
> {code}
> test_queue_reasons_slots seems to be know flaky test: IMPALA-10338
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