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java.io.IOException: Filesystem closed	at org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:319)	at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1026)	at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:524)	at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:768)	at com.sunchangming.searchlog.CopyAppLogs.copyFile(CopyAppLogs.java:51)	at com.sunchangming.searchlog.CopyAppLogs.access$000(CopyAppLogs.java:18)	at com.sunchangming.searchlog.CopyAppLogs$1.run(CopyAppLogs.java:194)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)	at java.util.concurrent.FutureTask.run(FutureTask.java:166)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:722)