java.lang.NullPointerException: This exception has no message.
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java.lang.NullPointerException:at org.apache.hadoop.fs.swift.snative.SwiftNativeOutputStream.flush(SwiftNativeOutputStream.java:103)at java.io.FilterOutputStream.flush(FilterOutputStream.java:140)at java.io.DataOutputStream.flush(DataOutputStream.java:123)at io.druid.indexer.JobHelper$4.push(JobHelper.java:375)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:497)at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:186)at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)at com.sun.proxy.$Proxy229.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)