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This article mainly shows you "how to debug hadoop remotely", which is easy to understand and clear, hoping to help you solve your doubts. Let the editor lead you to study and learn this article "how to debug hadoop remotely".

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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