2009-05-19 04:30:38 +00:00
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#!/usr/bin/env bash
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership.
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# The ASF licenses this file to You under the Apache License, Version 2.0
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# (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# Run a shell command on all slave hosts.
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#
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# Environment Variables
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#
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# HADOOP_SLAVES File naming remote hosts.
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# Default is ${HADOOP_CONF_DIR}/slaves.
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# HADOOP_CONF_DIR Alternate conf dir. Default is ${HADOOP_HOME}/conf.
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# HADOOP_SLAVE_SLEEP Seconds to sleep between spawning remote commands.
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# HADOOP_SSH_OPTS Options passed to ssh when running remote commands.
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##
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usage="Usage: slaves.sh [--config confdir] command..."
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# if no args specified, show usage
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if [ $# -le 0 ]; then
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echo $usage
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exit 1
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fi
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2010-04-29 23:23:53 +00:00
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bin=`dirname "${BASH_SOURCE-$0}"`
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2009-05-19 04:30:38 +00:00
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bin=`cd "$bin"; pwd`
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. "$bin"/hadoop-config.sh
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# If the slaves file is specified in the command line,
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# then it takes precedence over the definition in
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# hadoop-env.sh. Save it here.
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HOSTLIST=$HADOOP_SLAVES
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if [ -f "${HADOOP_CONF_DIR}/hadoop-env.sh" ]; then
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. "${HADOOP_CONF_DIR}/hadoop-env.sh"
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fi
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if [ "$HOSTLIST" = "" ]; then
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if [ "$HADOOP_SLAVES" = "" ]; then
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export HOSTLIST="${HADOOP_CONF_DIR}/slaves"
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else
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export HOSTLIST="${HADOOP_SLAVES}"
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fi
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fi
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for slave in `cat "$HOSTLIST"|sed "s/#.*$//;/^$/d"`; do
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ssh $HADOOP_SSH_OPTS $slave $"${@// /\\ }" \
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2>&1 | sed "s/^/$slave: /" &
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if [ "$HADOOP_SLAVE_SLEEP" != "" ]; then
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sleep $HADOOP_SLAVE_SLEEP
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fi
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done
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wait
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