Github user jkbradley commented on the issue:
https://github.com/apache/spark/pull/13176
Did you try setting this up so the data has 1 partition only? That would
likely fix the issue with varying # cores affecting results.
Also, can you please create a new JIRA for this PR to make it clear in JIRA
what it is addressing? Please link it to SPARK-15100. Thanks!
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