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
I had the same problem, I changed
<property>
<name>fs.defaultFS</name>
<value>hdfs://localhost:8020</value>
</property>
in core-site.xml to
<property>
<name>fs.defaultFS</name>
<value>hdfs://ip-address:8020</value>
</property>
and it worked
I encountered the same issue. After ran jps, we can see all the namenode and datanode are running up. but cannot see the active node in the web page. And I found I put 127.0.0.1 master in /etc/hosts. After removed it. the slaves can telnet master 9000.
My /etc/hosts looks like:
127.0.0.1 localhost
192.168.139.129 slave1
192.168.139.130 slave2
192.168.139.128 master
来源：https://stackoverflow.com/questions/20883564/hadoop-connection-refused-on-namenode