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Explorer
Posts: 12
Registered: ‎08-30-2018
Accepted Solution

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

[ Edited ]

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.

 

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Cloudera Employee
Posts: 5
Registered: ‎10-10-2018

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

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

Explorer
Posts: 12
Registered: ‎08-30-2018

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

Thanks a lot!