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refresh-namenodes.sh
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Tue, Feb 25, 14:53

refresh-namenodes.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.
# ------------------------------------------------------------------
# This script refreshes all namenodes, it's a simple wrapper
# for dfsadmin to support multiple namenodes.
bin=`dirname "$0"`
bin=`cd "$bin"; pwd`
DEFAULT_LIBEXEC_DIR="$bin"/../libexec
HADOOP_LIBEXEC_DIR=${HADOOP_LIBEXEC_DIR:-$DEFAULT_LIBEXEC_DIR}
. $HADOOP_LIBEXEC_DIR/hdfs-config.sh
namenodes=$("$HADOOP_PREFIX/bin/hdfs" getconf -nnRpcAddresses)
if [ "$?" != '0' ] ; then errorFlag='1' ;
else
for namenode in $namenodes ; do
echo "Refreshing namenode [$namenode]"
"$HADOOP_PREFIX/bin/hdfs" dfsadmin -fs hdfs://$namenode -refreshNodes
if [ "$?" != '0' ] ; then errorFlag='1' ; fi
done
fi
if [ "$errorFlag" = '1' ] ; then
echo "Error: refresh of namenodes failed, see error messages above."
exit 1
else
echo "Refresh of namenodes done."
fi
# eof

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