我一直在努力寻找所有Map者使用map\u input\u records变量解析的总记录数。以下是我使用的代码：

Counters counters = job.getCounters();
    for (CounterGroup group : counters) {
          System.out.println("* Counter Group: " + group.getDisplayName() + " (" + group.getName() + ")");
          System.out.println("  number of counters in this group: " + group.size());
          for (Counter counter : group) {
            System.out.println("  - " + counter.getDisplayName() + ": " + counter.getName() + ": "+counter.getValue());
          }
        }

此外，我还尝试使用以下代码片段：{

Counters counters = job.getCounters();
 int recordCountData = (int)
        //counters.getGroup("org.apache.hadoop.mapred.Task$Counter").findCounter("MAP_INPUT_RECORDS").getValue();
     int recordCountData = (int) counters.findCounter(
         "org.apache.hadoop.mapred.Task$Counter","MAP_INPUT_RECORDS")
         .getValue();

}
但每次它都会抛出以下错误：

Exception in thread "main" java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.CounterGroup, but class was expected
    at com.ssga.common.riskmeasures.validation.mr.RiskMeasuresValidationDriver.run(RiskMeasuresValidationDriver.java:169)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
    at com.ssga.common.riskmeasures.validation.mr.RiskMeasuresValidationDriver.main(RiskMeasuresValidationDriver.java:189)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:212)

附言：我正在试着使用上述方法后，job.waitforcompletion（真）在司机类。有什么办法可以解决这个问题吗？
提前谢谢。阿基列什