Xiaoye Sun created SPARK-18548:
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             Summary: OnlineLDAOptimizer reads the same broadcast data after 
deletion
                 Key: SPARK-18548
                 URL: https://issues.apache.org/jira/browse/SPARK-18548
             Project: Spark
          Issue Type: Improvement
          Components: MLlib
    Affects Versions: 1.6.1
            Reporter: Xiaoye Sun
            Priority: Trivial


In submitMiniBatch() called by OnlineLDAOptimizer, broadcast variable 
expElogbeta is deleted before its use in the second time, which causes the 
executor reads the same large broadcast data twice. I suggest to move the 
broadcast data deletion (expElogbetaBc.unpersist()) later. 




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