viirya commented on issue #25789: [SPARK-28927][ML] Show warning when input data to ALS is indeterminate URL: https://github.com/apache/spark/pull/25789#issuecomment-531537355 @srowen @felixcheung I am thinking to catch ArrayIndexOutOfBoundsException and throws a Spark exception with explainable message. Because we don't want to break user code, we don't strictly require deterministic RDD. In case that users don't notice about this issue, I think it should be better to see a explainable error message, instead of confusing ArrayIndexOutOfBoundsException. WDYT?
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