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https://issues.apache.org/jira/browse/IMPALA-11938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Quanlong Huang resolved IMPALA-11938.
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Fix Version/s: Impala 4.4.0
Resolution: Fixed
Resolving this. Thank [~j_anshula] !
> Raise error when NUM_NODES is set to a value other than 0 or 1
> --------------------------------------------------------------
>
> Key: IMPALA-11938
> URL: https://issues.apache.org/jira/browse/IMPALA-11938
> Project: IMPALA
> Issue Type: Bug
> Reporter: Zoltán Borók-Nagy
> Assignee: Anshula Jain
> Priority: Major
> Labels: newbie, ramp-up
> Fix For: Impala 4.4.0
>
>
> Since IMPALA-4746 is not implemented there is basically two modes of Impala
> to execute queries:
> * NUM_NODES = 0
> ** create a distributed plan and execute the query on as many executors as
> possible
> * NUM_NODES = 1
> ** create a single node plan and execute the query on the coordinator
> But currently users can specify any value to NUM_NODES, e.g. 42, but the
> behavior they get would correspond to the NUM_NODES = 0 case (distributed
> mode).
> Impala should raise an error when NUM_NODES is set to other value than 0 or 1
> so users won't have wrong assumptions.
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