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start-dfs.sh
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Tue, Feb 25, 19:14

start-dfs.sh
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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.
# Start hadoop dfs daemons.
# Optinally upgrade or rollback dfs state.
# Run this on master node.
usage="Usage: start-dfs.sh [-upgrade|-rollback] [other options such as -clusterId]"
bin=`dirname "${BASH_SOURCE-$0}"`
bin=`cd "$bin"; pwd`
DEFAULT_LIBEXEC_DIR="$bin"/../libexec
HADOOP_LIBEXEC_DIR=${HADOOP_LIBEXEC_DIR:-$DEFAULT_LIBEXEC_DIR}
. $HADOOP_LIBEXEC_DIR/hdfs-config.sh
# get arguments
if [ $# -ge 1 ]; then
nameStartOpt="$1"
shift
case "$nameStartOpt" in
(-upgrade)
;;
(-rollback)
dataStartOpt="$nameStartOpt"
;;
(*)
echo $usage
exit 1
;;
esac
fi
#Add other possible options
nameStartOpt="$nameStartOpt $@"
#---------------------------------------------------------
# namenodes
NAMENODES=$($HADOOP_PREFIX/bin/hdfs getconf -namenodes)
echo "Starting namenodes on [$NAMENODES]"
"$HADOOP_PREFIX/sbin/hadoop-daemons.sh" \
--config "$HADOOP_CONF_DIR" \
--hostnames "$NAMENODES" \
--script "$bin/hdfs" start namenode $nameStartOpt
#---------------------------------------------------------
# datanodes (using default slaves file)
if [ -n "$HADOOP_SECURE_DN_USER" ]; then
echo \
"Attempting to start secure cluster, skipping datanodes. " \
"Run start-secure-dns.sh as root to complete startup."
else
"$HADOOP_PREFIX/sbin/hadoop-daemons.sh" \
--config "$HADOOP_CONF_DIR" \
--script "$bin/hdfs" start datanode $dataStartOpt
fi
#---------------------------------------------------------
# secondary namenodes (if any)
SECONDARY_NAMENODES=$($HADOOP_PREFIX/bin/hdfs getconf -secondarynamenodes 2>/dev/null)
if [ -n "$SECONDARY_NAMENODES" ]; then
echo "Starting secondary namenodes [$SECONDARY_NAMENODES]"
"$HADOOP_PREFIX/sbin/hadoop-daemons.sh" \
--config "$HADOOP_CONF_DIR" \
--hostnames "$SECONDARY_NAMENODES" \
--script "$bin/hdfs" start secondarynamenode
fi
#---------------------------------------------------------
# quorumjournal nodes (if any)
SHARED_EDITS_DIR=$($HADOOP_PREFIX/bin/hdfs getconf -confKey dfs.namenode.shared.edits.dir 2>&-)
case "$SHARED_EDITS_DIR" in
qjournal://*)
JOURNAL_NODES=$(echo "$SHARED_EDITS_DIR" | sed 's,qjournal://\([^/]*\)/.*,\1,g; s/;/ /g; s/:[0-9]*//g')
echo "Starting journal nodes [$JOURNAL_NODES]"
"$HADOOP_PREFIX/sbin/hadoop-daemons.sh" \
--config "$HADOOP_CONF_DIR" \
--hostnames "$JOURNAL_NODES" \
--script "$bin/hdfs" start journalnode ;;
esac
#---------------------------------------------------------
# ZK Failover controllers, if auto-HA is enabled
AUTOHA_ENABLED=$($HADOOP_PREFIX/bin/hdfs getconf -confKey dfs.ha.automatic-failover.enabled)
if [ "$(echo "$AUTOHA_ENABLED" | tr A-Z a-z)" = "true" ]; then
echo "Starting ZK Failover Controllers on NN hosts [$NAMENODES]"
"$HADOOP_PREFIX/sbin/hadoop-daemons.sh" \
--config "$HADOOP_CONF_DIR" \
--hostnames "$NAMENODES" \
--script "$bin/hdfs" start zkfc
fi
# eof

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