Hadoop的配置在泊坞窗 - 一个Datanode将无法连接

Question

我想建立一个dockerized的Hadoop系统。我目前遇到的问题是datanode不会连接到namenode。对于一些背景：每个Docker镜像都运行hadoop角色和free-ipa客户端，并且所有的客户端都使用免费的ipa作为dns。所有hdfs服务正在hdfs用户uid：6001 gid：6001组：hadoop下运行。

这是我对名称节点看到的错误：

2014-10-16 15:52:28,066 WARN [IPC Server handler 4 on 8020] blockmanagement.DatanodeManager (DatanodeManager.java:registerDatanode(738)) - Unresolved datanode registration from 172.31.1.166 
2014-10-16 15:52:28,067 ERROR [IPC Server handler 4 on 8020] security.UserGroupInformation (UserGroupInformation.java:doAs(1494)) - PriviledgedActionException as:hdfs (auth:SIMPLE) cause:org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException: Datanode denied communication with namenode: DatanodeRegistration(0.0.0.0, storageID=DS-300514933-172.31.1.166-50010-1413489147639, infoPort=50075, ipcPort=50020, storageInfo=lv=-47;cid=CID-41426277-e1f8-4154-8189-a0b556231333;nsid=900398376;c=0) 
2014-10-16 15:52:28,068 INFO [IPC Server handler 4 on 8020] ipc.Server (Server.java:run(2075)) - IPC Server handler 4 on 8020, call org.apache.hadoop.hdfs.server.protocol.DatanodeProtocol.registerDatanode from 172.31.1.166:35452 Call#1 Retry#0: error: org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException: Datanode denied communication with namenode: DatanodeRegistration(0.0.0.0, storageID=DS-300514933-172.31.1.166-50010-1413489147639, infoPort=50075, ipcPort=50020, storageInfo=lv=-47;cid=CID-41426277-e1f8-4154-8189-a0b556231333;nsid=900398376;c=0) 
org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException: Datanode denied communication with namenode: DatanodeRegistration(0.0.0.0, storageID=DS-300514933-172.31.1.166-50010-1413489147639, infoPort=50075, ipcPort=50020, storageInfo=lv=-47;cid=CID-41426277-e1f8-4154-8189-a0b556231333;nsid=900398376;c=0) 
at org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.registerDatanode(DatanodeManager.java:739) 
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.registerDatanode(FSNamesystem.java:3944) 
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.registerDatanode(NameNodeRpcServer.java:948) 
at org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolServerSideTranslatorPB.registerDatanode(DatanodeProtocolServerSideTranslatorPB.java:90) 
at org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos$DatanodeProtocolService$2.callBlockingMethod(DatanodeProtocolProtos.java:24079) 
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:585) 
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:928) 
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2053) 
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2049) 
at java.security.AccessController.doPrivileged(Native Method) 
at javax.security.auth.Subject.doAs(Subject.java:415) 
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491) 
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2047) 

和数据管理部：

2014-10-16 15:52:28,030 INFO [DataNode: [file:/data/hdfs/dd] heartbeating to namenode.example.internal/172.31.1.51:8020] datanode.DataNode (BPServiceActor.java:register(618)) - Block pool BP-763144819-172.31.1.51-1413403838191 (storage id DS-300514933-172.31.1.166-50010-1413489147639) service to namenode.example.internal/172.31.1.51:8020 beginning handshake with NN 
2014-10-16 15:52:28,083 FATAL [DataNode: [file:/data/hdfs/dd] heartbeating to namenode.example.internal/172.31.1.51:8020] datanode.DataNode (BPServiceActor.java:run(668)) - Initialization failed for block pool Block pool BP-763144819-172.31.1.51-1413403838191 (storage id DS-300514933-172.31.1.166-50010-1413489147639) service to namenode.example.internal/172.31.1.51:8020 
org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException): Datanode denied communication with namenode: DatanodeRegistration(0.0.0.0, storageID=DS-300514933-172.31.1.166-50010-1413489147639, infoPort=50075, ipcPort=50020, storageInfo=lv=-47;cid=CID-41426277-e1f8-4154-8189-a0b556231333;nsid=900398376;c=0) 
at org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager.registerDatanode(DatanodeManager.java:739) 
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.registerDatanode(FSNamesystem.java:3944) 
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.registerDatanode(NameNodeRpcServer.java:948) 
at org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolServerSideTranslatorPB.registerDatanode(DatanodeProtocolServerSideTranslatorPB.java:90) 
at org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos$DatanodeProtocolService$2.callBlockingMethod(DatanodeProtocolProtos.java:24079) 
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:585) 
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:928) 
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2053) 
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2049) 
at java.security.AccessController.doPrivileged(Native Method) 
at javax.security.auth.Subject.doAs(Subject.java:415) 
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491) 
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2047) 

at org.apache.hadoop.ipc.Client.call(Client.java:1347) 
at org.apache.hadoop.ipc.Client.call(Client.java:1300) 
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:206) 
at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source) 
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:186) 
at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102) 
at com.sun.proxy.$Proxy9.registerDatanode(Unknown Source) 
at org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB.registerDatanode(DatanodeProtocolClientSideTranslatorPB.java:146) 
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.register(BPServiceActor.java:623) 
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:225) 
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:664) 
at java.lang.Thread.run(Thread.java:744) 

Answer 1

我想通了！

Hadoop的向前既有和反向DNS和我没有创建反向DNS记录，这一点很重要。

确保做到这一点!!!!