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Yarn AppMaste调试
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一般都是这种形式，YARN_OPTS="$YARN_OPTS $YARN_CLIENT_OPTS -Xdebug -Xrunjdwp:transport=dt_socket,address=8792,server=y,suspend=y "
但是MRMaster不知道加在哪里，查看了封神的博客后，恍然大悟，
http://fengshenwu.com/blog/tag/hadoop2yarn/
AM需要在配置文件mapred-site.xml配置：
<property>
<name>yarn.app.mapreduce.am.command-opts</name>
<value>-Xmx1000m -Xdebug -Xrunjdwp:transport=dt_socket,address=5555,server=y,suspend=n</value>
</property>[liuqiang@localhost container_1395565534919_0001_01_000001]$ pwd
/home/liuqiang/hadoop-2.2.0/logs/userlogs/application_1395565534919_0001/container_1395565534919_0001_01_000001
[liuqiang@localhost container_1395565534919_0001_01_000001]$ cat stdout
Listening for transport dt_socket at address: 8792
OK
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