让hadoop远程调试飞
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读hadoop源代码时,经常需要调试源代码。hadoop几乎所有的进程的启动最终全部依靠$HADOOP_HOME/bin/hadoop 脚本实现,开始就简单的在需要的地方添加JDWP的debug选项,做的多了,感觉不够自动化,简单修改了一下hadoop这个脚本,让自动化远程调试飞!
修改的脚本如下:
在$HADOOP_HOME/bin/hadoop中后添加:
- . "$bin"/hadoop-config.sh
- choose_debug_port()
- {
- debug_port_base=11000
- while [ -z "$DEBUG_PORT" ]
- do
- if [ "$(netstat -tln |grep $debug_port_base |wc -l)" -eq 0 ]
- then
- DEBUG_PORT=$debug_port_base
- else
- debug_port_base=$(($debug_port_base+1))
- fi
- done
- }
- debug_file="$bin/hadoop.debug"
- choose_debug_port
- is_debug_enabled()
- {
- if [ -f "$debug_file" ]
- then
- echo $(cat $debug_file | grep $1)
- fi
- }
在$HADOOP_HOME/bin/hadoop中246行后添加( # cygwin path translation前):
- if [ $(is_debug_enabled $COMMAND) ]
- then
- echo "debug for $COMMAND is enabled, port:$DEBUG_PORT"
- export HADOOP_OPTS="$HADOOP_OPTS -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,address=$DEBUG_PORT,suspend=y,server=y "
- fi
这样,hadoop脚本会根据COMMAND和$HADOOP_HOME/bin/hadoop.debug 内容决定是否开启调试。
比如,想调试datanode,执行echo datanode > $HADOOP_HOME/bin/hadoop.debug
启动hadoop时,仅仅datanode会开启remote debug
console显示:
- debug for datanode is enabled, port:11000
- Listening for transport dt_socket at address: 11000
想开启namenode等调试,仅仅需要echo 你想调试的command > $HADOOP_HOME/bin/hadoop.debug
hadoop命令支持的所有COMMAND都可以轻松开启调试:
附hadoop所有命令:
- hadoop@haitaoyao-laptop:~/hadoop/bin$ hadoop
- Usage: hadoop [--config confdir] COMMAND
- where COMMAND is one of:
- namenode -format format the DFS filesystem
- secondarynamenode run the DFS secondary namenode
- namenode run the DFS namenode
- datanode run a DFS datanode
- dfsadmin run a DFS admin client
- mradmin run a Map-Reduce admin client
- fsck run a DFS filesystem checking utility
- fs run a generic filesystem user client
- balancer run a cluster balancing utility
- jobtracker run the MapReduce job Tracker node
- pipes run a Pipes job
- tasktracker run a MapReduce task Tracker node
- job manipulate MapReduce jobs
- queue get information regarding JobQueues
- version print the version
- jar <jar> run a jar file
- distcp <srcurl> <desturl> copy file or directories recursively
- archive -archiveName NAME <src>* <dest> create a hadoop archive
- daemonlog get/set the log level for each daemon
- or
- CLASSNAME run the class named CLASSNAME
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