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#!/usr/bin/env bash
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# 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 <conf-dir>] command..."
# if no args specified, show usage
if [ $# -le 0 ]; then
echo $usage
exit 1
fi
sbin="`dirname "$0"`"
sbin="`cd "$sbin"; pwd`"
. "$sbin/spark-config.sh"
# If the slaves file is specified in the command line,
# then it takes precedence over the definition in
# spark-env.sh. Save it here.
if [ -f "$SPARK_SLAVES" ]; then
HOSTLIST=`cat "$SPARK_SLAVES"`
fi
# Check if --config is passed as an argument. It is an optional parameter.
# Exit if the argument is not a directory.
if [ "$1" == "--config" ]
then
shift
conf_dir="$1"
if [ ! -d "$conf_dir" ]
then
echo "ERROR : $conf_dir is not a directory"
echo $usage
exit 1
else
export SPARK_CONF_DIR="$conf_dir"
fi
shift
fi
. "$SPARK_PREFIX/bin/load-spark-env.sh"
if [ "$HOSTLIST" = "" ]; then
if [ "$SPARK_SLAVES" = "" ]; then
if [ -f "${SPARK_CONF_DIR}/slaves" ]; then
HOSTLIST=`cat "${SPARK_CONF_DIR}/slaves"`
else
HOSTLIST=localhost
fi
else
HOSTLIST=`cat "${SPARK_SLAVES}"`
fi
fi
# By default disable strict host key checking
if [ "$SPARK_SSH_OPTS" = "" ]; then
SPARK_SSH_OPTS="-o StrictHostKeyChecking=no"
fi
for slave in `echo "$HOSTLIST"|sed "s/#.*$//;/^$/d"`; do
if [ -n "${SPARK_SSH_FOREGROUND}" ]; then
ssh $SPARK_SSH_OPTS "$slave" $"${@// /\\ }" \
2>&1 | sed "s/^/$slave: /"
else
ssh $SPARK_SSH_OPTS "$slave" $"${@// /\\ }" \
2>&1 | sed "s/^/$slave: /" &
fi
if [ "$SPARK_SLAVE_SLEEP" != "" ]; then
sleep $SPARK_SLAVE_SLEEP
fi
done
wait
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