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java.lang.NullPointerException: 	at org.apache.hadoop.fs.s3native.NativeS3FileSystem.getFileStatus(NativeS3FileSystem.java:433)	at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1399)	at org.apache.hadoop.fs.s3native.NativeS3FileSystem.create(NativeS3FileSystem.java:341)	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:907)	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:868)	at io.druid.indexer.JobHelper$4.push(JobHelper.java:368)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:186)	at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)	at com.sun.proxy.$Proxy194.push(Unknown Source)	at io.druid.indexer.JobHelper.serializeOutIndex(JobHelper.java:386)	at io.druid.indexer.IndexGeneratorJob$IndexGeneratorReducer.reduce(IndexGeneratorJob.java:703)	at io.druid.indexer.IndexGeneratorJob$IndexGeneratorReducer.reduce(IndexGeneratorJob.java:469)	at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:171)	at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:627)	at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:389)	at org.apache.hadoop.mapred.LocalJobRunner$Job$ReduceTaskRunnable.run(LocalJobRunner.java:319)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)