I've recently installed Hadoop on my Windows and to test it out I wrote the following line hadoop fs -ls in the command prompt and after that it gives the following error
ls: Call From DESKTOP-I1FS520/192.168.100.57 to localhost:9000 failed on connection exception: java.net.ConnectException: Connection refused: no further information; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
I don't know how to fix, any help would be appreciated
The error indicates your namenode is not running or the address is misconfigured for the namenode location (fs.defaultFS) in your core-site.xml
Related
I am trying to run the following command:
hadoop fs -ls /data
It is giving me the following error:
Call From elkd02/127.0.1.1 to localhost:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
I do not understand what is going wrong. I have checked the /etc/hosts file and it contains following:
127.0.0.1 Localhost
127.0.1.1 elkd02
How should I resolve the issue?
I'm reading a book on hadoop, which i'm running locally with docker. I'm using image from sequenceiq and trying to execute this command:
./bin/hadoop fs -copyFromLocal /input/docs/quangle.txt hdfs://localhost/user/4lex1v/quangle.txt
But it throws an error:
copyFromLocal: Call From e9584b413d6a/172.17.0.2 to localhost:8020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
I don't have such problems running it locally, how can i fix it?
If client and server in same ubuntu machine, not able to connect.
giving error
Call From ashish/127.0.0.1 to localhost:54310 failed on connection
exception: java.net.ConnectException: Connection refused; For more
details see: http://wiki.apache.org/hadoop/ConnectionRefused
By server do you mean namenode? By client do you mean hadoop client, datanode, nodemanager? Are you sure namenode is running and exposed on localhost:54310? Could you try
> nc -vz localhost 54310
How does your /etc/hosts look like? How does your core-site.xml and hdfs-site.xml looks like? What do you get for (as your hadoop user):
> jps -ml
What do you get for:
> sudo iptables -L
Also take a look at:
Hadoop cluster setup - java.net.ConnectException: Connection refused
Hadoop Datanodes cannot find NameNode
I was trying to copy some local file to the HDFS, with this script:
bin/hadoop fs -copyFromLocal '/home/czy/IdeaProjects/HadoopInAction/FirstHadoop/src/main/resources/crossView.txt' /user/czy
It came like this:
copyFromLocal: Call From ubuntu/127.0.1.1 to localhost:8020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
But when I used a script like this(without hdfs://localhost/), it worked well:
bin/hadoop fs -copyFromLocal '/home/czy/IdeaProjects/HadoopInAction/FirstHadoop/src/main/resources/crossView.txt' /user/czy
Why did this happen? Why do I received to localhost:8020 failed when I configured namenode port to 9000?
Check your core-site.xml file for valid parameters, server and port names
Check below link..it might be useful...
https://datashine.wordpress.com/2014/09/06/java-net-connectexception-connection-refused-for-more-details-see-httpwiki-apache-orghadoopconnectionrefused/
I have build a hadoop cluster on ECS on Aliyun of Alibaba.com( it's like AWS）. The OS is Ubuntu12.04 . The version of Hadoop is 2.7.1
The cluster is consisted of one master and two slaves.
I can start it successfully. Every node can work well, and I
can use ssh to access two slave node from master node.
Every node is started.
But when I run the wordcount program, there is something wrong. The
error is as following:
exception: java.net.ConnectException: Call From master/10.144.52.189 to localhost:38635 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
When I added Port 38635 in the file /etc/ssh/sshd_config, I run the wordcount program again. The error is still existed, the only difference is the Port 38635 changed.
exception: java.net.ConnectException: Call From master/10.144.52.189 to localhost:46656 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
How to fix this problem? The ports 38635 and 46656 are added in /etc/ssh/sshd_config, the error occurs when run the wordcount program with a new port in the error information.