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java.lang.NoClassDefFoundError: Could not initialize class org.apache.hadoop.security.JniBasedUnixGroupsMapping	at org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback.(JniBasedUnixGroupsMappingWithFallback.java:38)	at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:131)	at org.apache.hadoop.security.Groups.(Groups.java:64)	at org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Groups.java:240)	at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:255)	at org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:232)	at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:718)	at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:703)	at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:605)	at org.apache.hadoop.fs.FileSystem$Cache$Key.(FileSystem.java:2554)	at org.apache.hadoop.fs.FileSystem$Cache$Key.(FileSystem.java:2546)	at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2412)	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:368)	at org.apache.hadoop.fs.Path.getFileSystem(Path.java:296)	at org.apache.flume.sink.hdfs.BucketWriter$1.call(BucketWriter.java:243)	at org.apache.flume.sink.hdfs.BucketWriter$1.call(BucketWriter.java:235)	at org.apache.flume.sink.hdfs.BucketWriter$9$1.run(BucketWriter.java:679)	at org.apache.flume.auth.SimpleAuthenticator.execute(SimpleAuthenticator.java:50)	at org.apache.flume.sink.hdfs.BucketWriter$9.call(BucketWriter.java:676)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:744)