Job.getCounters() throws null pointer exception.

Thu, 18 Oct 2018 10:03:58 -0700 

Hi Hadoop community.
We are using Hadoop 2.6.0 with cdh 5.13.1 and we are getting following NP 
exception when Job#getCounters() method is called:
java.lang.NullPointerException: null
                at 
org.apache.hadoop.mapreduce.counters.AbstractCounters.<init>(AbstractCounters.java:106)
                at 
org.apache.hadoop.mapreduce.Counters.<init>(Counters.java:150)
                at org.apache.hadoop.mapreduce.Job.getCounters(Job.java:508)

I know job completed successfully and it has counters. I think 
RunningJob#getCounters() returning null and AbstractCounters’s constructor is 
trying to iterate over this null. What is the right way to get the Counters 
object from org.apache.hadoop.mapreduce.Job object that doesn’t fail? The thing 
is this works most of the time and fails once in a while.

Any idea of what might be causing this?

Thanks.
Elbek.

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