jiangrui created HADOOP-18348:
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Summary: echo java process's parent pid to the pid file
intermediate state
Key: HADOOP-18348
URL: https://issues.apache.org/jira/browse/HADOOP-18348
Project: Hadoop Common
Issue Type: Bug
Components: common
Reporter: jiangrui
In hadoop-function.sh file，there is hadoop_start_daemon and
hadoop_start_daemon_wrapper functions.
hadoop_start_daemon_wrapper invoke hadoop_start_daemon and put it to background.
In hadoop_start_daemon function, echo $$ > pidfile，cause this scenario
because hadoop_start_daemon is in a subshell by ampersand, and $ expands to the
process ID of the current shell, not the subshell.
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