This section explains the environment variables set in hadoop-env.sh.
Environment variable | Default value/Value to be set |
|---|---|
HADOOP_CLASSPATH CLASSPATH of the JVM that operates Hadoop | Default value None Value to be set $HADOOP_CLASSPATH:/opt/FJSVpdfs/lib/pdfs.jar |
HADOOP_JOBTRACKER_OPTS Launch option specifically for the JVM that operates the JobTracker | Default value -Dcom.sun.management.jmxremote $HADOOP_JOBTRACKER_OPTS Value to be set -Xmx$$m -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=60001 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Djava.rmi.server.hostname=localhost -Dhadoop.security.logger=INFO,DRFAS -Dmapred.audit.logger=INFO,MRAUDIT -Dhadoop.mapreduce.jobsummary.logger=INFO,JSA $HADOOP_JOBTRACKER_OPTS $$ = physicalMemorySizeInMb / 3 |
HADOOP_OPTS Launch option for the JVM that operates Hadoop | Default value None Value to be set -Djava.net.preferIPv4Stack=true $HADOOP_OPTS |
HADOOP_SSH_OPTS Option specified in ssh when Hadoop uses ssh | Default value None Value to be set -o StrictHostKeyChecking=no -o BatchMode=yes |
HADOOP_TASKTRACKER_OPTS Launch option specifically for the JVM that operates the TaskTracker | Default value None Value to be set -Xmx$$m -Dcom.sun.management.jmxremote $$ = The lesser of the following values:
|
HADOOP_USER_CLASSPATH_FIRST Add HADOOP_CLASSPATH specification to the beginning of the existing CLASSPATH | Default value None Value to be set true |
JAVA_HOME Path of the JVM used by Hadoop | Default value None Value to be set JVM installation directory |
Note
In some cases, values to be set for some parameters (JVM-specific launch options) may be displayed across several lines, even though the specified value does not actually include a newline.
