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https://issues.apache.org/jira/browse/HADOOP-18779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17736067#comment-17736067
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ASF GitHub Bot commented on HADOOP-18779:
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slfan1989 commented on PR #5762:
URL: https://github.com/apache/hadoop/pull/5762#issuecomment-1602421592
@goiri I have carefully read the code related to the `--daemon` flag and
conducted experiments in a testing environment.
The daemon of hdfs/yarn contains 3 operations, namely start|status|stop
- hdfs --daemon start namenode
When starting the namenode, we can use the command `hdfs --daemon start
namenode`, which initiates the namenode without generating any output
information. I believe this behavior is appropriate.
<img width="482" alt="image"
src="https://github.com/apache/hadoop/assets/55643692/8fbb023c-8153-4dc8-aee2-4c164893a476";>
- hdfs --daemon status namenode
When utilizing the `hdfs --daemon status namenode` command, I still expect
it to provide some information regarding the namenode's status. Nevertheless, I
have noticed that executing this command does not yield any output.
<img width="475" alt="image"
src="https://github.com/apache/hadoop/assets/55643692/dd92256b-6741-4a5f-b3bb-299bbe72b06d";>
I have added some output information for the `status` command.
- If the service is in a running state.
<img width="484" alt="image"
src="https://github.com/apache/hadoop/assets/55643692/48f6cdb7-1acc-480f-bc8c-9c8c2615e9db";>
- If the service is in a stopped state.
<img width="489" alt="image"
src="https://github.com/apache/hadoop/assets/55643692/57446a1f-f19f-419e-8f10-ab4c35770276";>
This modification only affects the `status` command of the daemon and does
not have any impact on the 'start' or 'stop' commands.
> Improve hadoop-function.sh#status script
> ----------------------------------------
>
> Key: HADOOP-18779
> URL: https://issues.apache.org/jira/browse/HADOOP-18779
> Project: Hadoop Common
> Issue Type: Improvement
> Components: common
> Affects Versions: 3.4.0
> Reporter: Shilun Fan
> Assignee: Shilun Fan
> Priority: Major
> Labels: pull-request-available
>
> When we use yarn --daemon status router/nodemanager, I found that no
> information can be displayed. I checked the script and modified the script of
> hadoop-functions.sh#status to increase the output information.
> yarn --daemon status router
> - If the service is started
> router is running as process 47626.
> - If the service is stop
> router is stopped.
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