When I try to connect to Hadoop I get a error as - Connecting to Resource Manager failed

Question

After installing hadoop 2.2 and trying to launch pipes example I've got the following error (the same error shows up after trying to launch hadoop jar hadoop-mapreduce-examples-2.2.0.jar wordcount someFile.txt /out):

Answer 1

Make sure you've started Yarn. Use this command to start it:

start-yarn.sh

Then use this command to verify that the Resource Manager is running:

jps

The output should look something like this:

17542 NameNode

17920 SecondaryNameNode

22064 Jps

17703 DataNode

18226 ResourceManager

18363 NodeManager