btrace脚本追踪MapReduce的性能，追踪到的数据输出问题

实验环境：btrace1.3.3，hadoop2.8.1伪分布式，使用-javaagent的方式执行btrace脚本。

配置如下

btrace脚本：
import com.sun.btrace.annotations.*;

import static com.sun.btrace.BTraceUtils.*;

@BTrace
public class BtraceProfiler {

@TLS private static long mapFunctionStartTime = 0l;
 @OnMethod(clazz="org.apache.hadoop.mapredude.Reducer",  
         method="run",
         location=@Location(where=Where.BEFORE, value=Kind.CALL,clazz="/.*/", 
         method="reduce"))  
 public static void onReducer_reduce_stage_startTime() {   
     reduceStageStartTime=timeMillis();
}

 /*
  * fetch  reduce stage time
  * */
 @OnMethod(clazz="org.apache.hadoop.mapredude.Reducer",  
         method="run",
         location=@Location(where=Where.AFTER, value=Kind.CALL,clazz="/.*/", 
         method="reduce"))  
 public static void onReducer_reduce_stage_Time() {   
     println("reduce_stage_time\t"+(timeMillis()-reduceStageStartTime));
}

}

执行过程

运行hibench的sort，查看相应的标准输出，结果如下：
t/upload/201712/08/1512720659_355155.png)

是我找的数据输出位置错误？？？还是什么地方出错了？？请大佬指导

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