| #!/usr/bin/env bash |
| # |
| # Run a shell command on all slave hosts. |
| # |
| # Environment Variables |
| # |
| # HADOOP_SLAVES File naming remote hosts. |
| # Default is ${HADOOP_CONF_DIR}/slaves. |
| # HADOOP_CONF_DIR Alternate conf dir. Default is ${HADOOP_HOME}/conf. |
| # HADOOP_SLAVE_SLEEP Seconds to sleep between spawning remote commands. |
| # HADOOP_SSH_OPTS Options passed to ssh when running remote commands. |
| ## |
| |
| usage="Usage: slaves.sh [--config confdir] command..." |
| |
| # if no args specified, show usage |
| if [ $# -le 0 ]; then |
| echo $usage |
| exit 1 |
| fi |
| |
| bin=`dirname "$0"` |
| bin=`cd "$bin"; pwd` |
| |
| . "$bin"/hadoop-config.sh |
| |
| # If the slaves file is specified in the command line, |
| # then it takes precedence over the definition in |
| # hadoop-env.sh. Save it here. |
| HOSTLIST=$HADOOP_SLAVES |
| |
| if [ -f "${HADOOP_CONF_DIR}/hadoop-env.sh" ]; then |
| . "${HADOOP_CONF_DIR}/hadoop-env.sh" |
| fi |
| |
| if [ "$HOSTLIST" = "" ]; then |
| if [ "$HADOOP_SLAVES" = "" ]; then |
| export HOSTLIST="${HADOOP_CONF_DIR}/slaves" |
| else |
| export HOSTLIST="${HADOOP_SLAVES}" |
| fi |
| fi |
| |
| for slave in `cat "$HOSTLIST"`; do |
| ssh $HADOOP_SSH_OPTS $slave $"${@// /\\ }" \ |
| 2>&1 | sed "s/^/$slave: /" & |
| if [ "$HADOOP_SLAVE_SLEEP" != "" ]; then |
| sleep $HADOOP_SLAVE_SLEEP |
| fi |
| done |
| |
| wait |