hadoop/bin/slaves.sh

69 lines
2.0 KiB
Bash
Executable File

#!/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
#
# 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 "$HOSTLIST"|sed "s/#.*$//;/^$/d"`; do
ssh $HADOOP_SSH_OPTS $slave $"${@// /\\ }" \
2>&1 | sed "s/^/$slave: /" &
if [ "$HADOOP_SLAVE_SLEEP" != "" ]; then
sleep $HADOOP_SLAVE_SLEEP
fi
done
wait