java.lang.Exception: java.lang.OutOfMemoryError: Java heap space
	at org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:492) ~[hadoop-mapreduce-client-common-3.1.4.jar:?]
	at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:552) ~[hadoop-mapreduce-client-common-3.1.4.jar:?]
Caused by: java.lang.OutOfMemoryError: Java heap space
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.init(MapTask.java:1000) ~[hadoop-mapreduce-client-core-3.1.4.jar:?]
	at org.apache.hadoop.mapred.MapTask.createSortingCollector(MapTask.java:408) ~[hadoop-mapreduce-client-core-3.1.4.jar:?]
	at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:454) ~[hadoop-mapreduce-client-core-3.1.4.jar:?]
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:349) ~[hadoop-mapreduce-client-core-3.1.4.jar:?]
	at org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:271) ~[hadoop-mapreduce-client-common-3.1.4.jar:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_202]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_202]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[?:1.8.0_202]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[?:1.8.0_202]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_202]

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