We usually can use hadoop jarto submit your own jar package
hadoop jar $HADOOP_HOME/share/hadoop/mapreduce/sources/hadoop-mapreduce-examples-2.7.2-sources.jar org.apache.hadoop.examples.WordCount /user/root/input /user/root/output
Add two lines to the hadoop script to print the class path and java command
You can see hadoop jarthat it is essentially an encapsulation of java commands
CLASSPATH is dynamically added by the hadoop script according to the executed command, and different tasks will be different
export CLASSPATH=="/usr/local/hadoop/etc/hadoop:/usr/local/hadoop/share/hadoop/common/lib/*:/usr/local/hadoop/share/hadoop/common/*:/usr/local/hadoop/share/hadoop/hdfs:/usr/local/hadoop/share/hadoop/hdfs/lib/*:/usr/local/hadoop/share/hadoop/hdfs/*:/usr/local/hadoop/share/hadoop/yarn/lib/*:/usr/local/hadoop/share/hadoop/yarn/*:/usr/local/hadoop/share/hadoop/mapreduce/lib/*:/usr/local/hadoop/share/hadoop/mapreduce/*:/usr/local/hadoop/contrib/capacity-scheduler/*.jar"
/usr/lib/jvm/java-7-openjdk-amd64/bin/java -Xmx1000m -Djava.net.preferIPv4Stack=true -Dhadoop.log.dir=/usr/local/hadoop/logs -Dhadoop.log.file=hadoop.log -Dhadoop.home.dir=/usr/local/hadoop -Dhadoop.id.str= -Dhadoop.root.logger=INFO,console -Djava.library.path=/usr/local/hadoop/lib/native -Dhadoop.policy.file=hadoop-policy.xml -Djava.net.preferIPv4Stack=true -Xmx512m -Dhadoop.security.logger=INFO,NullAppender org.apache.hadoop.util.RunJar /usr/local/hadoop/share/hadoop/mapreduce/sources/hadoop-mapreduce-examples-2.7.2-sources.jar org.apache.hadoop.examples.WordCount /user/root/input /user/root/output
When executing directly, pay attention to the difference between the local path and the hdfs path
. Add remote debugging parameters to the previous java command.
-agentlib:jdwp=transport=dt_socket,address=5005,server=y,suspend=y
/usr/lib/jvm/java-7-openjdk-amd64/bin/java -agentlib:jdwp=transport=dt_socket,address=5005,server=y,suspend=y -Xmx1000m -Djava.net.preferIPv4Stack=true -Dhadoop.log.dir=/usr/local/hadoop/logs -Dhadoop.log.file=hadoop.log -Dhadoop.home.dir=/usr/local/hadoop -Dhadoop.id.str= -Dhadoop.root.logger=INFO,console -Djava.library.path=/usr/local/hadoop/lib/native -Dhadoop.policy.file=hadoop-policy.xml -Djava.net.preferIPv4Stack=true -Xmx512m -Dhadoop.security.logger=INFO,NullAppender org.apache.hadoop.util.RunJar /usr/local/hadoop/share/hadoop/mapreduce/sources/hadoop-mapreduce-examples-2.7.2-sources.jar org.apache.hadoop.examples.WordCount /user/root/input /user/root/output
Modify the corresponding ip and port in idea to debug remotely
