Hadoop : start-dfs.sh Connection refused
There is a problem the way pdsh works by default (see edit), but Hadoop can go without it. Hadoop checks if the system has pdsh on /usr/bin/pdsh and uses it if so. An easy way get away from using pdsh is editing $HADOOP_HOME/libexec/hadoop-functions.sh
replace the line
if [[ -e '/usr/bin/pdsh' ]]; thenby
if [[ ! -e '/usr/bin/pdsh' ]]; thenthen hadoop goes without pdsh and everything works.
EDIT:
A better solution would be use pdsh, but with ssh instead rsh as explained here, so replace line from $HADOOP_HOME/libexec/hadoop-functions.sh:
PDSH_SSH_ARGS_APPEND="${HADOOP_SSH_OPTS}" pdsh \by
PDSH_RCMD_TYPE=ssh PDSH_SSH_ARGS_APPEND="${HADOOP_SSH_OPTS}" pdsh \Obs: Only doing export PDSH_RCMD_TYPE=ssh, as I mention in the comment, doesn't work. I don't know why...
I've also opened a issue and submitted a patch to this problem: HADOOP-15219
check if your /etc/hosts file contains the hostname stretch and localhost mapping or not