Github user nchammas commented on the pull request:
https://github.com/apache/spark/pull/2083#issuecomment-54176053
@srowen Thanks for clarifying that. I agree that it would be confusing for
people to get different results depending on when they lookup an item in an
RDD. Perhaps the appropriate solution for the time being is just clear
documentation about this behavior--that is, if you want a consistent path to a
piece of data, you need a persistent index on the containing data set.
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