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#!/usr/bin/env bash
# Run a shell command on all slave hosts.
#
# Environment Variables
#
# SPARK_SLAVES File naming remote hosts.
# Default is ${SPARK_CONF_DIR}/slaves.
# SPARK_CONF_DIR Alternate conf dir. Default is ${SPARK_HOME}/conf.
# SPARK_SLAVE_SLEEP Seconds to sleep between spawning remote commands.
# SPARK_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`
. "$bin/spark-config.sh"
# If the slaves file is specified in the command line,
# then it takes precedence over the definition in
# spark-env.sh. Save it here.
HOSTLIST=$SPARK_SLAVES
if [ -f "${SPARK_CONF_DIR}/spark-env.sh" ]; then
. "${SPARK_CONF_DIR}/spark-env.sh"
fi
if [ "$HOSTLIST" = "" ]; then
if [ "$SPARK_SLAVES" = "" ]; then
export HOSTLIST="${SPARK_CONF_DIR}/slaves"
else
export HOSTLIST="${SPARK_SLAVES}"
fi
fi
echo $"${@// /\\ }"
# By default disable strict host key checking
if [ "$SPARK_SSH_OPTS" = "" ]; then
SPARK_SSH_OPTS="-o StrictHostKeyChecking=no"
fi
for slave in `cat "$HOSTLIST"|sed "s/#.*$//;/^$/d"`; do
ssh $SPARK_SSH_OPTS $slave $"${@// /\\ }" \
2>&1 | sed "s/^/$slave: /" &
if [ "$SPARK_SLAVE_SLEEP" != "" ]; then
sleep $SPARK_SLAVE_SLEEP
fi
done
wait