Get custom Mapper's counters from Reducer

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I have exactly the same question as: Accessing a mapper's counter from a reducer

I.e., I want to get the value of a custom Counter that was used in a Mapper, from my Reducer.

The suggested solution:

// in the Reducer class...
private long mapperCounter;

public void configure(JobConf conf) {
   JobClient client = new JobClient(conf);
   RunningJob parentJob = client.getJob(JobID.forName( conf.get("mapred.job.id") ));
   mapperCounter = parentJob.getCounters().getCounter(MAP_COUNTER_NAME);
}

does not work for me (using Hadoop 1.2.0), since I get a NullPointerException in the final line. getCounters() returns null.

asked 2 mins ago

vefthym

950