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https://issues.apache.org/jira/browse/IMPALA-11938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17829334#comment-17829334
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ASF subversion and git services commented on IMPALA-11938:
----------------------------------------------------------
Commit 2a19acf73453220374e93b292b847a3dcf1fb2a5 in impala's branch
refs/heads/master from Anshula Jain
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=2a19acf73 ]
IMPALA-11938: Raised error if NUM_NODES is set to invalid value.
If NUM_NODES is set to a value other than 0 or 1 below error is raised
ERROR: Invalid value for query option NUM_NODES: <value> is not in range [0, 1]
Change-Id: Ib283ae350875a7ac217490c216a26281f1bb4812
Reviewed-on: http://gerrit.cloudera.org:8080/21147
Reviewed-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
> 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
>
> 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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