[jira] [Work logged] (HADOOP-18348) Echo java process's parent pid to the pid file intermediate state

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-18348?focusedWorklogId=792496&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-792496 ]

ASF GitHub Bot logged work on HADOOP-18348:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 19/Jul/22 08:15
            Start Date: 19/Jul/22 08:15
    Worklog Time Spent: 10m 
      Work Description: Pr-Jiang opened a new pull request, #4589:
URL: https://github.com/apache/hadoop/pull/4589

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   ### Description of PR
   https://issues.apache.org/jira/browse/HADOOP-18348
   
   ### How was this patch tested?
   
   
   ### For code changes:
   
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Issue Time Tracking
-------------------

            Worklog Id:     (was: 792496)
    Remaining Estimate: 0h
            Time Spent: 10m

> 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
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> 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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