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org.apache.hadoop.mapred.FileAlreadyExistsException: Output directory hdfs://mycluster/hadoop already exists	at org.apache.hadoop.mapreduce.lib.output.FileOutputFormat.checkOutputSpecs(FileOutputFormat.java:146)	at org.apache.hadoop.mapreduce.JobSubmitter.checkSpecs(JobSubmitter.java:456)	at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:342)	at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1268)	at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1265)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.Subject.doAs(Subject.java:415)	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491)	at org.apache.hadoop.mapreduce.Job.submit(Job.java:1265)	at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1286)	at org.apache.hadoop.hbase.mapreduce.Export.main(Export.java:189)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:72)	at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:144)	at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:152)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.apache.hadoop.hbase.mapreduce.Driver.main(Driver.java:54)