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java.lang.RuntimeException: at at org.apache.hadoop.mapred.Merger$MergeQueue.lessThan( at org.apache.hadoop.util.PriorityQueue.upHeap( at org.apache.hadoop.util.PriorityQueue.put( at org.apache.hadoop.mapred.Merger$MergeQueue.merge( at org.apache.hadoop.mapred.Merger$MergeQueue.merge( at org.apache.hadoop.mapred.Merger.merge( at org.apache.hadoop.mapred.Merger.merge( at org.apache.hadoop.mapred.ReduceTask$ReduceCopier.createKVIterator( at org.apache.hadoop.mapred.ReduceTask$ReduceCopier.access$400( at at org.apache.hadoop.mapred.Child.main( by: at at speeditup.MsRead.readFields( at ... 11 more