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)
```
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
