java.lang.RuntimeException: water.DException$DistributedException: from /172.16.2.175:56789; by class water.rapids.ASTGroupBy$GBTask; class water.DException$DistributedException: from /172.16.2.175:56791; by class water.rapids.ASTGroupBy$GBTask; class java.lang.NullPointerException: null
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water.DException$DistributedException: from /172.16.2.175:56789; by class water.rapids.ASTGroupBy$GBTask; class water.DException$DistributedException: from /172.16.2.175:56791; by class water.rapids.ASTGroupBy$GBTask; class java.lang.NullPointerException: null
at water.rapids.ASTGroupBy$GBTask.map(ASTGroupBy.java:215)
at water.MRTask.compute2(MRTask.java:415)
at water.MRTask.compute2(MRTask.java:374)
at water.MRTask.compute2(MRTask.java:374)
at water.MRTask.compute2(MRTask.java:374)
at water.MRTask.compute2(MRTask.java:374)
at water.H2O$H2OCountedCompleter.compute(H2O.java:672)
at jsr166y.CountedCompleter.exec(CountedCompleter.java:429)
at jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:263)
at jsr166y.ForkJoinPool$WorkQueue.pollAndExecAll(ForkJoinPool.java:914)
at jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:979)
at jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1477)
at jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104)