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java.lang.UnsupportedOperationException: empty collection at org.apache.spark.rdd.RDD$$anonfun$reduce$1$$anonfun$apply$35.apply(RDD.scala:985) at org.apache.spark.rdd.RDD$$anonfun$reduce$1$$anonfun$apply$35.apply(RDD.scala:985) at scala.Option.getOrElse(Option.scala:121) at org.apache.spark.rdd.RDD$$anonfun$reduce$1.apply(RDD.scala:985) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112) at org.apache.spark.rdd.RDD.withScope(RDD.scala:358) at org.apache.spark.rdd.RDD.reduce(RDD.scala:965) at org.apache.spark.mllib.linalg.distributed.IndexedRowMatrix.numRows(IndexedRowMatrix.scala:66) at org.apache.spark.mllib.linalg.distributed.IndexedRowMatrix.toCoordinateMatrix(IndexedRowMatrix.scala:128) at esiptestbed.mudrod.utils.MatrixUtil.transposeMatrix(MatrixUtil.java:487) at esiptestbed.mudrod.utils.SimilarityUtil.CalSimilarityFromVector(SimilarityUtil.java:62) at esiptestbed.mudrod.semantics.SemanticAnalyzer.calTermSimfromMatrix(SemanticAnalyzer.java:69) at esiptestbed.mudrod.semantics.SemanticAnalyzer.calTermSimfromMatrix(SemanticAnalyzer.java:60) at esiptestbed.mudrod.weblog.process.UserHistoryAnalyzer.execute(UserHistoryAnalyzer.java:54) at esiptestbed.mudrod.discoveryengine.WeblogDiscoveryEngine.process(WeblogDiscoveryEngine.java:202) at esiptestbed.mudrod.main.MudrodEngine.startFullIngest(MudrodEngine.java:159) at esiptestbed.mudrod.main.MudrodEngine.main(MudrodEngine.java:357)