hadoop 1.2.1 hadoop-env.sh

# Set Hadoop-specific environment variables here.

 

# The only required environment variable is JAVA_HOME. All others are

# optional. When running a distributed configuration it is best to

# set JAVA_HOME in this file, so that it is correctly defined on

# remote nodes.

 

# The java implementation to use.

# 指定java home

export JAVA_HOME=${JAVA_HOME}

export HADOOP_CONF_DIR=${HADOOP_CONF_DIR:-"/etc/hadoop"}

 

# The maximum amount of heap to use, in MB. Default is 1000.

# 指定hadoop最大的堆内存大小

export HADOOP_HEAPSIZE=

#export HADOOP_NAMENODE_INIT_HEAPSIZE=""

 

# Extra Java runtime options. Empty by default.

export HADOOP_OPTS="-Djava.net.preferIPv4Stack=true $HADOOP_CLIENT_OPTS"

 

# Command specific options appended to HADOOP_OPTS when specified

export HADOOP_NAMENODE_OPTS="-Dhadoop.security.logger=INFO,DRFAS -Dhdfs.audit.logger=INFO,DRFAAUDIT $HADOOP_NAMENODE_OPTS"

HADOOP_JOBTRACKER_OPTS="-Dhadoop.security.logger=INFO,DRFAS -Dmapred.audit.logger=INFO,MRAUDIT -Dhadoop.mapreduce.jobsummary.logger=INFO,JSA $HADOOP_JOBTRACKER_OPTS"

HADOOP_TASKTRACKER_OPTS="-Dhadoop.security.logger=ERROR,console -Dmapred.audit.logger=ERROR,console $HADOOP_TASKTRACKER_OPTS"

HADOOP_DATANODE_OPTS="-Dhadoop.security.logger=ERROR,DRFAS $HADOOP_DATANODE_OPTS"

 

export HADOOP_SECONDARYNAMENODE_OPTS="-Dhadoop.security.logger=INFO,DRFAS -Dhdfs.audit.logger=INFO,DRFAAUDIT $HADOOP_SECONDARYNAMENODE_OPTS"

 

# The following applies to multiple commands (fs, dfs, fsck, distcp etc)

export HADOOP_CLIENT_OPTS="-Xmx128m $HADOOP_CLIENT_OPTS"

#HADOOP_JAVA_PLATFORM_OPTS="-XX:-UsePerfData $HADOOP_JAVA_PLATFORM_OPTS"

 

# On secure datanodes, user to run the datanode as after dropping privileges

export HADOOP_SECURE_DN_USER=${HADOOP_SECURE_DN_USER}

 

# Where log files are stored. $HADOOP_HOME/logs by default.

export HADOOP_LOG_DIR=${HADOOP_LOG_DIR}/$USER

 

# Where log files are stored in the secure data environment.

export HADOOP_SECURE_DN_LOG_DIR=${HADOOP_LOG_DIR}/${HADOOP_HDFS_USER}

 

# The directory where pid files are stored. /tmp by default.

export HADOOP_PID_DIR=${HADOOP_PID_DIR}

export HADOOP_SECURE_DN_PID_DIR=${HADOOP_PID_DIR}

 

# A string representing this instance of hadoop. $USER by default.

export HADOOP_IDENT_STRING=$USER