How to access Hadoop counter values using API

Question

In Hadoop we can increment the counter in map/reduce task using this:

context.getCounter(MyCountersEnum.SomeCounter).increment(1);

and then, the value is available in the log file. 

Suppose I want to access them from code after the job completes, which Hadoop API should I use to read the counter value?

Answer 1

You can use the job object to access the counter. Try this:

Counters counters = job.getCounters();
Counter counter = counters.findCounter(MyCountersEnum.SomeCounter);
System.out.println(counter.getDisplayName() + ": " + counter.getValue());