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java.lang.OutOfMemoryError: PermGen space	at java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClass(ClassLoader.java:800)	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)	at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)	at java.net.URLClassLoader.access$100(URLClassLoader.java:71)	at java.net.URLClassLoader$1.run(URLClassLoader.java:361)	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)	at java.lang.Class.getDeclaredMethods0(Native Method)	at java.lang.Class.privateGetDeclaredMethods(Class.java:2615)	at java.lang.Class.getMethod0(Class.java:2856)	at java.lang.Class.getMethod(Class.java:1668)	at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.getReturnProtoType(ProtobufRpcEngine.java:293)	at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:258)	at com.sun.proxy.$Proxy184.getServerDefaults(Unknown Source)	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getServerDefaults(ClientNamenodeProtocolTranslatorPB.java:267)	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.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:187)	at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)	at com.sun.proxy.$Proxy185.getServerDefaults(Unknown Source)	at org.apache.hadoop.hdfs.DFSClient.getServerDefaults(DFSClient.java:1007)	at org.apache.hadoop.hdfs.DFSClient.shouldEncryptData(DFSClient.java:2043)	at org.apache.hadoop.hdfs.DFSClient.newDataEncryptionKey(DFSClient.java:2049)	at org.apache.hadoop.hdfs.protocol.datatransfer.sasl.SaslDataTransferClient.checkTrustAndSend(SaslDataTransferClient.java:208)	at org.apache.hadoop.hdfs.protocol.datatransfer.sasl.SaslDataTransferClient.socketSend(SaslDataTransferClient.java:182)	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1413)