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R3704/2.3.0/hadoop-2.3.0-src/hadoop-common-project/hadoop-common/src/main/bin/hadoop-config.sh
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hadoop-config.sh
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# 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.
# included in all the hadoop scripts with source command
# should not be executable directly
# also should not be passed any arguments, since we need original $*
# Resolve links ($0 may be a softlink) and convert a relative path
# to an absolute path. NB: The -P option requires bash built-ins
# or POSIX:2001 compliant cd and pwd.
# HADOOP_CLASSPATH Extra Java CLASSPATH entries.
#
# HADOOP_USER_CLASSPATH_FIRST When defined, the HADOOP_CLASSPATH is
# added in the beginning of the global
# classpath. Can be defined, for example,
# by doing
# export HADOOP_USER_CLASSPATH_FIRST=true
#
this="${BASH_SOURCE-$0}"
common_bin=$(cd -P -- "$(dirname -- "$this")" && pwd -P)
script="$(basename -- "$this")"
this="$common_bin/$script"
[ -f "$common_bin/hadoop-layout.sh" ] && . "$common_bin/hadoop-layout.sh"
HADOOP_COMMON_DIR=${HADOOP_COMMON_DIR:-"share/hadoop/common"}
HADOOP_COMMON_LIB_JARS_DIR=${HADOOP_COMMON_LIB_JARS_DIR:-"share/hadoop/common/lib"}
HADOOP_COMMON_LIB_NATIVE_DIR=${HADOOP_COMMON_LIB_NATIVE_DIR:-"lib/native"}
HDFS_DIR=${HDFS_DIR:-"share/hadoop/hdfs"}
HDFS_LIB_JARS_DIR=${HDFS_LIB_JARS_DIR:-"share/hadoop/hdfs/lib"}
YARN_DIR=${YARN_DIR:-"share/hadoop/yarn"}
YARN_LIB_JARS_DIR=${YARN_LIB_JARS_DIR:-"share/hadoop/yarn/lib"}
MAPRED_DIR=${MAPRED_DIR:-"share/hadoop/mapreduce"}
MAPRED_LIB_JARS_DIR=${MAPRED_LIB_JARS_DIR:-"share/hadoop/mapreduce/lib"}
# the root of the Hadoop installation
# See HADOOP-6255 for directory structure layout
HADOOP_DEFAULT_PREFIX=$(cd -P -- "$common_bin"/.. && pwd -P)
HADOOP_PREFIX=${HADOOP_PREFIX:-$HADOOP_DEFAULT_PREFIX}
export HADOOP_PREFIX
#check to see if the conf dir is given as an optional argument
if [ $# -gt 1 ]
then
if [ "--config" = "$1" ]
then
shift
confdir=$1
if [ ! -d "$confdir" ]; then
echo "Error: Cannot find configuration directory: $confdir"
exit 1
fi
shift
HADOOP_CONF_DIR=$confdir
fi
fi
# Allow alternate conf dir location.
if [ -e "${HADOOP_PREFIX}/conf/hadoop-env.sh" ]; then
DEFAULT_CONF_DIR="conf"
else
DEFAULT_CONF_DIR="etc/hadoop"
fi
export HADOOP_CONF_DIR="${HADOOP_CONF_DIR:-$HADOOP_PREFIX/$DEFAULT_CONF_DIR}"
# User can specify hostnames or a file where the hostnames are (not both)
if [[ ( "$HADOOP_SLAVES" != '' ) && ( "$HADOOP_SLAVE_NAMES" != '' ) ]] ; then
echo \
"Error: Please specify one variable HADOOP_SLAVES or " \
"HADOOP_SLAVE_NAME and not both."
exit 1
fi
# Process command line options that specify hosts or file with host
# list
if [ $# -gt 1 ]
then
if [ "--hosts" = "$1" ]
then
shift
export HADOOP_SLAVES="${HADOOP_CONF_DIR}/$$1"
shift
elif [ "--hostnames" = "$1" ]
then
shift
export HADOOP_SLAVE_NAMES=$1
shift
fi
fi
# User can specify hostnames or a file where the hostnames are (not both)
# (same check as above but now we know it's command line options that cause
# the problem)
if [[ ( "$HADOOP_SLAVES" != '' ) && ( "$HADOOP_SLAVE_NAMES" != '' ) ]] ; then
echo \
"Error: Please specify one of --hosts or --hostnames options and not both."
exit 1
fi
if [ -f "${HADOOP_CONF_DIR}/hadoop-env.sh" ]; then
. "${HADOOP_CONF_DIR}/hadoop-env.sh"
fi
# check if net.ipv6.bindv6only is set to 1
bindv6only=$(/sbin/sysctl -n net.ipv6.bindv6only 2> /dev/null)
if [ -n "$bindv6only" ] && [ "$bindv6only" -eq "1" ] && [ "$HADOOP_ALLOW_IPV6" != "yes" ]
then
echo "Error: \"net.ipv6.bindv6only\" is set to 1 - Java networking could be broken"
echo "For more info: http://wiki.apache.org/hadoop/HadoopIPv6"
exit 1
fi
# Newer versions of glibc use an arena memory allocator that causes virtual
# memory usage to explode. This interacts badly with the many threads that
# we use in Hadoop. Tune the variable down to prevent vmem explosion.
export MALLOC_ARENA_MAX=${MALLOC_ARENA_MAX:-4}
# Attempt to set JAVA_HOME if it is not set
if [[ -z $JAVA_HOME ]]; then
# On OSX use java_home (or /Library for older versions)
if [ "Darwin" == "$(uname -s)" ]; then
if [ -x /usr/libexec/java_home ]; then
export JAVA_HOME=($(/usr/libexec/java_home))
else
export JAVA_HOME=(/Library/Java/Home)
fi
fi
# Bail if we did not detect it
if [[ -z $JAVA_HOME ]]; then
echo "Error: JAVA_HOME is not set and could not be found." 1>&2
exit 1
fi
fi
JAVA=$JAVA_HOME/bin/java
# some Java parameters
JAVA_HEAP_MAX=-Xmx1000m
# check envvars which might override default args
if [ "$HADOOP_HEAPSIZE" != "" ]; then
#echo "run with heapsize $HADOOP_HEAPSIZE"
JAVA_HEAP_MAX="-Xmx""$HADOOP_HEAPSIZE""m"
#echo $JAVA_HEAP_MAX
fi
# CLASSPATH initially contains $HADOOP_CONF_DIR
CLASSPATH="${HADOOP_CONF_DIR}"
# so that filenames w/ spaces are handled correctly in loops below
IFS=
if [ "$HADOOP_COMMON_HOME" = "" ]; then
if [ -d "${HADOOP_PREFIX}/$HADOOP_COMMON_DIR" ]; then
export HADOOP_COMMON_HOME=$HADOOP_PREFIX
fi
fi
# for releases, add core hadoop jar & webapps to CLASSPATH
if [ -d "$HADOOP_COMMON_HOME/$HADOOP_COMMON_DIR/webapps" ]; then
CLASSPATH=${CLASSPATH}:$HADOOP_COMMON_HOME/$HADOOP_COMMON_DIR
fi
if [ -d "$HADOOP_COMMON_HOME/$HADOOP_COMMON_LIB_JARS_DIR" ]; then
CLASSPATH=${CLASSPATH}:$HADOOP_COMMON_HOME/$HADOOP_COMMON_LIB_JARS_DIR'/*'
fi
CLASSPATH=${CLASSPATH}:$HADOOP_COMMON_HOME/$HADOOP_COMMON_DIR'/*'
# default log directory & file
if [ "$HADOOP_LOG_DIR" = "" ]; then
HADOOP_LOG_DIR="$HADOOP_PREFIX/logs"
fi
if [ "$HADOOP_LOGFILE" = "" ]; then
HADOOP_LOGFILE='hadoop.log'
fi
# default policy file for service-level authorization
if [ "$HADOOP_POLICYFILE" = "" ]; then
HADOOP_POLICYFILE="hadoop-policy.xml"
fi
# restore ordinary behaviour
unset IFS
# setup 'java.library.path' for native-hadoop code if necessary
if [ -d "${HADOOP_PREFIX}/build/native" -o -d "${HADOOP_PREFIX}/$HADOOP_COMMON_LIB_NATIVE_DIR" ]; then
if [ -d "${HADOOP_PREFIX}/$HADOOP_COMMON_LIB_NATIVE_DIR" ]; then
if [ "x$JAVA_LIBRARY_PATH" != "x" ]; then
JAVA_LIBRARY_PATH=${JAVA_LIBRARY_PATH}:${HADOOP_PREFIX}/$HADOOP_COMMON_LIB_NATIVE_DIR
else
JAVA_LIBRARY_PATH=${HADOOP_PREFIX}/$HADOOP_COMMON_LIB_NATIVE_DIR
fi
fi
fi
# setup a default TOOL_PATH
TOOL_PATH="${TOOL_PATH:-$HADOOP_PREFIX/share/hadoop/tools/lib/*}"
HADOOP_OPTS="$HADOOP_OPTS -Dhadoop.log.dir=$HADOOP_LOG_DIR"
HADOOP_OPTS="$HADOOP_OPTS -Dhadoop.log.file=$HADOOP_LOGFILE"
HADOOP_OPTS="$HADOOP_OPTS -Dhadoop.home.dir=$HADOOP_PREFIX"
HADOOP_OPTS="$HADOOP_OPTS -Dhadoop.id.str=$HADOOP_IDENT_STRING"
HADOOP_OPTS="$HADOOP_OPTS -Dhadoop.root.logger=${HADOOP_ROOT_LOGGER:-INFO,console}"
if [ "x$JAVA_LIBRARY_PATH" != "x" ]; then
HADOOP_OPTS="$HADOOP_OPTS -Djava.library.path=$JAVA_LIBRARY_PATH"
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$JAVA_LIBRARY_PATH
fi
HADOOP_OPTS="$HADOOP_OPTS -Dhadoop.policy.file=$HADOOP_POLICYFILE"
# Disable ipv6 as it can cause issues
HADOOP_OPTS="$HADOOP_OPTS -Djava.net.preferIPv4Stack=true"
# put hdfs in classpath if present
if [ "$HADOOP_HDFS_HOME" = "" ]; then
if [ -d "${HADOOP_PREFIX}/$HDFS_DIR" ]; then
export HADOOP_HDFS_HOME=$HADOOP_PREFIX
fi
fi
if [ -d "$HADOOP_HDFS_HOME/$HDFS_DIR/webapps" ]; then
CLASSPATH=${CLASSPATH}:$HADOOP_HDFS_HOME/$HDFS_DIR
fi
if [ -d "$HADOOP_HDFS_HOME/$HDFS_LIB_JARS_DIR" ]; then
CLASSPATH=${CLASSPATH}:$HADOOP_HDFS_HOME/$HDFS_LIB_JARS_DIR'/*'
fi
CLASSPATH=${CLASSPATH}:$HADOOP_HDFS_HOME/$HDFS_DIR'/*'
# put yarn in classpath if present
if [ "$HADOOP_YARN_HOME" = "" ]; then
if [ -d "${HADOOP_PREFIX}/$YARN_DIR" ]; then
export HADOOP_YARN_HOME=$HADOOP_PREFIX
fi
fi
if [ -d "$HADOOP_YARN_HOME/$YARN_DIR/webapps" ]; then
CLASSPATH=${CLASSPATH}:$HADOOP_YARN_HOME/$YARN_DIR
fi
if [ -d "$HADOOP_YARN_HOME/$YARN_LIB_JARS_DIR" ]; then
CLASSPATH=${CLASSPATH}:$HADOOP_YARN_HOME/$YARN_LIB_JARS_DIR'/*'
fi
CLASSPATH=${CLASSPATH}:$HADOOP_YARN_HOME/$YARN_DIR'/*'
# put mapred in classpath if present AND different from YARN
if [ "$HADOOP_MAPRED_HOME" = "" ]; then
if [ -d "${HADOOP_PREFIX}/$MAPRED_DIR" ]; then
export HADOOP_MAPRED_HOME=$HADOOP_PREFIX
fi
fi
if [ "$HADOOP_MAPRED_HOME/$MAPRED_DIR" != "$HADOOP_YARN_HOME/$YARN_DIR" ] ; then
if [ -d "$HADOOP_MAPRED_HOME/$MAPRED_DIR/webapps" ]; then
CLASSPATH=${CLASSPATH}:$HADOOP_MAPRED_HOME/$MAPRED_DIR
fi
if [ -d "$HADOOP_MAPRED_HOME/$MAPRED_LIB_JARS_DIR" ]; then
CLASSPATH=${CLASSPATH}:$HADOOP_MAPRED_HOME/$MAPRED_LIB_JARS_DIR'/*'
fi
CLASSPATH=${CLASSPATH}:$HADOOP_MAPRED_HOME/$MAPRED_DIR'/*'
fi
# Add the user-specified CLASSPATH via HADOOP_CLASSPATH
# Add it first or last depending on if user has
# set env-var HADOOP_USER_CLASSPATH_FIRST
if [ "$HADOOP_CLASSPATH" != "" ]; then
# Prefix it if its to be preceded
if [ "$HADOOP_USER_CLASSPATH_FIRST" != "" ]; then
CLASSPATH=${HADOOP_CLASSPATH}:${CLASSPATH}
else
CLASSPATH=${CLASSPATH}:${HADOOP_CLASSPATH}
fi
fi
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