handoop connect error with put/copyFromLocal

Question

I was following a tutorial to install hadoop: http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluster/ Now I am stuck at the "Copy local example data to HDFS" step.

The connection error I get:

<12/10/26 17:29:16 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 0 time(s).
12/10/26 17:29:17 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 1 time(s).
12/10/26 17:29:18 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 2 time(s).
12/10/26 17:29:19 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 3 time(s).
12/10/26 17:29:20 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 4 time(s).
12/10/26 17:29:21 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 5 time(s).
12/10/26 17:29:22 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 6 time(s).
12/10/26 17:29:23 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 7 time(s).
12/10/26 17:29:24 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 8 time(s).
12/10/26 17:29:25 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:54310. Already tried 9 time(s).
Bad connection to FS. command aborted. exception: Call to localhost/127.0.0.1:54310 failed on connection exception: java.net.ConnectException: Connection refused

which is pretty much the same to this question already: Errors while running hadoop

The point now is, I have disabled the ivp6, as described there and in above tutorial, but it doesn't help. Is there something I have been missing?

EDIT:

I repeated the tutorial on a second machine with a freshly installed ubuntu and compared it step by step. It turned out, there was some bug in the bashrc configuration of the hduser. Afterwards it worked fine...

Answer 1

I get the exact error message if I try to do Hadoop fs <anything> when the DataNode/NameNode aren't running, so I would guess the same is happening for you.

Type jps in your terminal. If everything is running, it should look like:

16022 DataNode
16524 Jps
15434 TaskTracker
15223 JobTracker
15810 NameNode
16229 SecondaryNameNode

I would wager that you're DataNode or NameNode isn't running. If anything is missing from jps's print out, start it again.