hadoop - 连接在namenode上被拒绝 [英] hadoop - Connection refused on namenode
问题描述
我在2节点集群设置中安装了hadoop yarn 2.2.0。但出了点问题。
当我启动hadoop守护进程在主节点上使用start-dfs.sh和start-yarn.sh时，它们成功运行在主服务器和从服务器上（我的主服务器的主机名是RM，而我的从服务器的主机名是slv）。他们可以成功地相互ssh。但是当我想运行一项工作时，出现这个错误：
14/01/02 04:22:53 WARN util.NativeCodeLoader：无法为您的平台加载native-hadoop库......在适用的情况下使用builtin-java类
14/01/02 04:22:56 WARN hdfs.DFSClient：DataStreamer异常
org.apache.hadoop .ipc.RemoteException（java.io.IOException）：File / user / root / QuasiMonteCarlo_1388665371850_813553673 / in / part0只能复制到0节点而不是minReplication（= 1）。有0个数据节点正在运行，并且在此操作中不包含任何节点。
在org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget（BlockManager.java:1384）
在org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock（FSNamesystem。 Java的：2477）在org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock（NameNodeRpcServer.java:555
）
在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 $服务器$ ProtoBufRpcInvoker.call（ProtobufRpcEngine.java:585）
在org.apache.hadoop.ipc.RPC $ Server.call（RPC.java:928）
在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.se curity.AccessController.doPrivileged（本机方法）
在javax.security.auth.Subject.doAs（Subject.java:416）
在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）
在org.apache.hadoop.ipc.ProtobufRpcEngine $ Invoker.invoke（ProtobufRpcEngine.java:206）
。在com.sun.proxy。$ Proxy9.addBlock（来源不明）
在sun.reflect.NativeMethodAccessorImpl.invoke0（本地方法）
at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:57）
at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.lang.reflect.Method.invoke（Method.java:622）
在org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod（RetryInvocationHandler.java：
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日志中存在此日志：
2014-01-02 04：40：31,616 WARN org.apache.hadoop.hdfs.server.datanode.DataNode：连接到服务器的问题：RM / 192.168.1.101：9000
2014-01- 02 04：40：37,618 INFO org.apache.hadoop.ipc.Client：重试连接到服务器：RM / 192.168.1.101：9000。已尝试过0次$
2014-01-02 04：40：38,619 INFO org.apache.hadoop.ipc.Client：重试连接到服务器：RM / 192.168.1.101：9000。已经尝试过1次$
2014-01-02 04:40:39,620信息org.apache.hadoop.ipc.Client：重试连接到服务器：RM / 192.168.1.101：9000。已经尝试过2次$
2014-01-02 04:40:40,621 INFO org.apache.hadoop.ipc.Client：重试连接服务器：RM / 192.168.1.101：9000。已经尝试过3次（s）
我检查了主节点上的9000端口，输出是这样的：
tcp 0 0 127.0.0.1:9000 0.0.0.0:* LISTEN 10227 / java
我猜这个问题是由于在slave节点中当我
telnet RM 9000
它表示
$ b
尝试192.168.1.101。 ..
telnet：无法连接到远程主机：拒绝连接
但是
telnet RM
输出结果为：
尝试192.168.1.101 ...
连接到RM。
转义字符是'^]'。
Ubuntu 12.04.2 LTS
RM登录：
其他信息my / etc / hosts在master和奴隶如下：
127.0.0.1 RM | slv localhost
<192> 192 .1.101 RM
192.168.1.103 slv
任何人都可以给我建议解？
任何帮助真的很感激。
thanks
我认为问题在于您的主人正在监听 127.0.0.1 ：9000 ，所以datanode无法连接，因为它没有在 192.168.1.101:9000 处监听（理论上，一个好听的地方是 0.0.0.0:9000 因为避免了这个问题，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，或者先试试：
127.0.0.1 localhost
192.168.1.101 RM
192.168.1.103 slv
- 编辑：阅读下面的评论
I've searched web and stackoverflow for a long time but it was not useful.
I have installed hadoop yarn 2.2.0 in 2 node cluster setup. but something goes wrong. when I start hadoop daemons using start-dfs.sh and start-yarn.sh on master node, they successfully run in master and slave (my master's hostname is RM and my slave's hostname is slv). they can ssh each other successfully. but when I want to run a job, this error appears:
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)
and in datanode log this log exists:
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)
I checked the 9000 port on the master node and the output is this:
tcp 0 0 127.0.0.1:9000 0.0.0.0:* LISTEN 10227/java
I guess the problem is caused by the reason that in the slave node when I
telnet RM 9000
it says
Trying 192.168.1.101... telnet: Unable to connect to remote host: Connection refused
however
telnet RM
the output is :
Trying 192.168.1.101... Connected to RM. Escape character is '^]'. Ubuntu 12.04.2 LTS RM login:
for additional information my /etc/hosts on master and slave is as below:
127.0.0.1 RM|slv localhost
192.168.1.101 RM
192.168.1.103 slv
can anybody suggest me a solution? any help is really appreciated. thanks
I think the problem is that your master is listening on 127.0.0.1:9000, so datanode can't connect because it is not listening at 192.168.1.101:9000 (theoretically, a good place to listen is 0.0.0.0:9000 since avoids this problems, but seems this configuration is not accepted).
Maybe will fix modifying your /etc/hosts deleting the first line, or try first just with:
127.0.0.1 localhost
192.168.1.101 RM
192.168.1.103 slv
-- edit: read comments bellow
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