How to debug hadoop remotely

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1. Fill in the following information into the hadoop-en.sh environment variable, if you debug NameNode.

HADOOP_NAMENODE_OPTS= "- agentlib:jdwp=transport=dt_socket,address=8888,server=y,suspend=y"

# HADOOP_SECONDARYNAMENODE_OPTS= "- agentlib:jdwp=transport=dt_socket,address=8789,server=y,suspend=y"

# HADOOP_DATANODE_OPTS= "- agentlib:jdwp=transport=dt_socket,address=8790,server=y,suspend=y"

# HADOOP_BALANCER_OPTS= "- agentlib:jdwp=transport=dt_socket,address=8791,server=y,suspend=y"

# HADOOP_JOBTRACKER_OPTS= "- agentlib:jdwp=transport=dt_socket,address=8792,server=y,suspend=y"

# HADOOP_TASKTRACKER_OPTS= "- agentlib:jdwp=transport=dt_socket,address=8793,server=y,suspend=y"

2. Open Eclipse, and the configuration file is shown in the figure.

3. Press and hold Ctrl to enter and you can see the NameNode source code

4. Debug settings

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