hadoop - 名称节点上的连接被拒绝

Question

我在网上和 stackoverflow 上搜索了很长时间，但没有用。

我在 2 节点集群设置中安装了 hadoop yarn 2.2.0。但出了点问题。 当我在主节点上使用 start-dfs.sh 和 start-yarn.sh 启动 hadoop 守护进程时，它们成功地在主节点和从节点中运行(我的主节点的主机名是 RM，我的从节点的主机名是 slv)。他们可以成功地互相ssh。但是当我想运行一个作业时，出现了这个错误:

14/01/02 04:22:53 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable 14/01/02 04:22:56 WARN hdfs.DFSClient: DataStreamer Exception org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /user/root/QuasiMonteCarlo_1388665371850_813553673/in/part0 could only be replicated to 0 nodes instead of minReplication (=1). There are 0 datanode(s) running and no node(s) are excluded in this operation. at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget(BlockManager.java:1384) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:2477) at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:555) at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:387) at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java:59582) at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:585) at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:928) at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2048) at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2044) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:416) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491) at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2042)

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.addBlock(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:622)
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.$Proxy9.addBlock(Unknown Source)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:330)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1226)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1078)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:514)

并且在datanode日志中存在这个日志:

2014-01-02 04:40:31,616 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Problem connecting to server: RM/192.168.1.101:9000 2014-01-02 04:40:37,618 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: RM/192.168.1.101:9000. Already tried 0 time(s)$ 2014-01-02 04:40:38,619 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: RM/192.168.1.101:9000. Already tried 1 time(s)$ 2014-01-02 04:40:39,620 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: RM/192.168.1.101:9000. Already tried 2 time(s)$ 2014-01-02 04:40:40,621 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: RM/192.168.1.101:9000. Already tried 3 time(s)

我检查了master节点上的9000端口，输出是这样的:

tcp 0 0 127.0.0.1:9000 0.0.0.0:* LISTEN 10227/java

我猜问题是因为我在slave节点的时候导致的

telnet RM 9000

它说

Trying 192.168.1.101... telnet: Unable to connect to remote host: Connection refused

但是

telnet RM

输出是:

Trying 192.168.1.101... Connected to RM. Escape character is '^]'. Ubuntu 12.04.2 LTS RM login:

有关其他信息，我在主从上的/etc/hosts 如下:

127.0.0.1 RM|slv localhost

192.168.1.101 RM

192.168.1.103 slv

有人可以建议我解决方案吗？ 非常感谢任何帮助。 谢谢

Answer 1

我认为问题是你的主人正在监听 127.0.0.1:9000，所以 datanode 无法连接，因为它没有监听 192.168.1.101:9000 (理论上，0.0.0.0:9000 是一个不错的收听位置，因为它避免了这个问题，但似乎不接受这个配置)。

也许会修复修改你的 /etc/hosts 删除第一行，或者先尝试:

127.0.0.1 localhost
192.168.1.101 RM
192.168.1.103 slv

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