Github user chiwanpark commented on the pull request:
https://github.com/apache/flink/pull/1500#issuecomment-175600967
About the type of number of containers for TaskManagers, it should be
optional because the user can the Scala Shell without specifying the number
when the user wants to connect already deployed YARN cluster.
(`bin/start-scala-shell.sh yarn`)
The number is required in only case of deploying YARN cluster for the shell.
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