Error with Pig on Yarn - PigStatsUtil - Failed to start job - IOException

I am hitting this error while doing Pig assignments over yarn. This error is not fatal, although the work assignments seem to be fine.

Just wanted to investigate this to see if any config is confusing. Has anyone else come across this?

Saw the same error on this Pig-User thread. Its not answered yet:

http://mail-archives.apache.org/mod_mbox/pig-user/201308.mbox/% 3CCA+HR8ZPo=64dx137eHMEaEJcG42ozvSk3LbTjyhmKasS23aBVw@mail.gmail .com% 3E

Any advice would be appreciated.

    [main] WARN  org.apache.pig.tools.pigstats.PigStatsUtil - Failed to get running job
java.io.IOException
        at org.apache.hadoop.mapred.ClientServiceDelegate.invoke(ClientServiceDelegate.java:317)
        at org.apache.hadoop.mapred.ClientServiceDelegate.getJobStatus(ClientServiceDelegate.java:385)
        at org.apache.hadoop.mapred.YARNRunner.getJobStatus(YARNRunner.java:495)
        at org.apache.hadoop.mapreduce.Cluster.getJob(Cluster.java:185)
        at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:624)
        at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:622)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:396)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1438)
        at org.apache.hadoop.mapred.JobClient.getJobUsingCluster(JobClient.java:622)
        at org.apache.hadoop.mapred.JobClient.getJob(JobClient.java:640)
        at org.apache.pig.tools.pigstats.PigStatsUtil.addSuccessJobStats(PigStatsUtil.java:345)
        at org.apache.pig.tools.pigstats.PigStatsUtil.accumulateStats(PigStatsUtil.java:257)
        at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.launchPig(MapReduceLauncher.java:324)
        at org.apache.pig.PigServer.launchPlan(PigServer.java:1266)
        at org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1251)
        at org.apache.pig.PigServer.execute(PigServer.java:1241)
        at org.apache.pig.PigServer.executeBatch(PigServer.java:335)
        at org.apache.pig.tools.grunt.GruntParser.executeBatch(GruntParser.java:137)
        at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:198)
        at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:170)
        at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:84)
        at org.apache.pig.Main.run(Main.java:475)
        at org.apache.pig.Main.main(Main.java:157)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:208)