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org.apache.hadoop.ipc.RetriableException: NameNode still not started	at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.checkNNStartup(NameNodeRpcServer.java:2015)	at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.sendHeartbeat(NameNodeRpcServer.java:1393)	at org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolServerSideTranslatorPB.sendHeartbeat(DatanodeProtocolServerSideTranslatorPB.java:114)	at org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos$DatanodeProtocolService$2.callBlockingMethod(DatanodeProtocolProtos.java:29064)	at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:969)	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2206)	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2202)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.Subject.doAs(Subject.java:422)	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1709)	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2200)