yikf opened a new pull request #3093:
URL: https://github.com/apache/hadoop/pull/3093
**What changes were proposed in this pull request?**
Currently, We will encounter NullPointerException when we use some yarn
shell commands, As follow:
```
Missing argument for options
usage: queue
-help Displays help for all commands.
-status <Queue Name> List queue information about given queue.
Exception in thread "main" java.lang.NullPointerException
at org.apache.hadoop.yarn.client.cli.YarnCLI.stop(YarnCLI.java:75)
at org.apache.hadoop.yarn.client.cli.QueueCLI.main(QueueCLI.java:51)
```
Like this, and
```
yarn cluster
yarn queue
yarn node
```
This is beacuse we dont`t init the `YarnClient` when missing argument for
options, This PR will fix the issue.
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