[FLINK-17891][yarn] Set execution.target to yarn-session in FlinkYarnSessionCli.run()

[kl0u]

What is the purpose of the change

Currently, when starting a yarn session cluster using the yarn-session.sh script or the FlinkYarnSessionCli.run() the displayed execution.target is yarn-per-job, which is misleading. We fix it by explicitly setting it to yarn-session.

Brief change log

We simply add a line in the FlinkYarnSessionCli.run() that set the correct value in the configuration to be shipped to the cluster.

Verifying this change

Was verified manually.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no)
• The serializers: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (yes / no / don't know)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (yes / no / don't know)

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

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Automated Checks

Last check on commit 6d193f4 (Fri Jun 12 15:07:50 UTC 2020)

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[kl0u]

@wangyang0918

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CI report:

• 6d193f4 Azure: SUCCESS

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[aljoscha]

This looks good to merge!

[wangyang0918]

Thanks @kl0u. This is a valid fix to always set the DeploymentOptions.TARGET to session in FlinkYarnSessionCli#run. I have verified it could take effect. + 1 for merging.