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java.lang.NullPointerException: 	at org.apache.hadoop.fs.s3native.NativeS3FileSystem.getFileStatus(	at org.apache.hadoop.fs.FileSystem.exists(	at org.apache.hadoop.fs.s3native.NativeS3FileSystem.create(	at org.apache.hadoop.fs.FileSystem.create(	at org.apache.hadoop.fs.FileSystem.create(	at io.druid.indexer.JobHelper$4.push(	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(	at sun.reflect.DelegatingMethodAccessorImpl.invoke(	at java.lang.reflect.Method.invoke(	at	at	at com.sun.proxy.$Proxy194.push(Unknown Source)	at io.druid.indexer.JobHelper.serializeOutIndex(	at io.druid.indexer.IndexGeneratorJob$IndexGeneratorReducer.reduce(	at io.druid.indexer.IndexGeneratorJob$IndexGeneratorReducer.reduce(	at	at org.apache.hadoop.mapred.ReduceTask.runNewReducer(	at	at org.apache.hadoop.mapred.LocalJobRunner$Job$	at java.util.concurrent.Executors$	at	at java.util.concurrent.ThreadPoolExecutor.runWorker(	at java.util.concurrent.ThreadPoolExecutor$	at