question Impala Admission control maximum concurrency queries: global or per impalad? in Support Questions

Impala Admission control maximum concurrency queries: global or per impalad?

Paulo — Fri, 16 Sep 2022 14:13:36 GMT

Hi,

If I set the following property in Impala config for admission control and pool "default", in llama-site.xml:

<property>
<name>llama.am.throttling.maximum.placed.reservations.root.default</name>
<value>4</value>
</property>

Suppose I have 3 Impala nodes and all of them have the same configuration above.

Does that mean I can run up to 12 concurrent queries (4 in each impalad) in default pool or just 4 overall?

Thanks,

Paulo.

Re: Impala Admission control maximum concurrency queries: global or per impalad?

BikramjeetVig — Thu, 14 Mar 2019 18:46:22 GMT

the property "llama.am.throttling.maximum.placed.reservations.root.*" places a limit on the total number of queries across the cluster. So in this case you can only run 4 overall

Re: Impala Admission control maximum concurrency queries: global or per impalad?

Paulo — Thu, 14 Mar 2019 19:43:59 GMT

Thanks a lot!