Github user rnowling commented on the pull request:
https://github.com/apache/spark/pull/1248#issuecomment-53480546
MiniBatch KMeans needs a sampling method that runs in O(k), where k is the
number of data points to sample time. Current Spark sampling methods run in
O(n) time, where n is the number of data points in the RDD. I'm closing this
PR until a better sampling method is found.
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