Github user rmetzger commented on the pull request:
https://github.com/apache/flink/pull/1978#issuecomment-219987643
Forgetting an argument leads to a NPE
```
robert@cdh544-master:~/flink/build-target$ ./bin/flink run -m yarn-cluster
./examples/batch/WordCount.jar
YARN cluster mode detected. Switching Log4j output to console
2016-05-18 10:30:12,762 ERROR org.apache.flink.yarn.cli.FlinkYarnSessionCli
- Missing required argument yn
2016-05-18 10:30:12,762 ERROR org.apache.flink.yarn.cli.FlinkYarnSessionCli
- Missing required argument yn
Usage:
Required
-yn,--yarncontainer <arg> Number of YARN container to allocate
(=Number of Task Managers)
Optional
-yD <arg> Dynamic properties
-yd,--yarndetached Start detached
-yjm,--yarnjobManagerMemory <arg> Memory for JobManager Container
[in MB]
-ynm,--yarnname <arg> Set a custom name for the
application on YARN
-yq,--yarnquery Display available YARN resources
(memory, cores)
-yqu,--yarnqueue <arg> Specify YARN queue.
-ys,--yarnslots <arg> Number of slots per TaskManager
-yst,--yarnstreaming Start Flink in streaming mode
-ytm,--yarntaskManagerMemory <arg> Memory per TaskManager Container
[in MB]
------------------------------------------------------------
The program finished with the following exception:
java.lang.NullPointerException
at
org.apache.flink.yarn.cli.FlinkYarnSessionCli.createClient(FlinkYarnSessionCli.java:370)
at
org.apache.flink.yarn.cli.FlinkYarnSessionCli.createClient(FlinkYarnSessionCli.java:55)
at org.apache.flink.client.CliFrontend.getClient(CliFrontend.java:948)
at org.apache.flink.client.CliFrontend.run(CliFrontend.java:302)
at
org.apache.flink.client.CliFrontend.parseParameters(CliFrontend.java:1067)
at org.apache.flink.client.CliFrontend.main(CliFrontend.java:1118)
```
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