Zoltán Borók-Nagy created IMPALA-11938:
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Summary: 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
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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