Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/1470#issuecomment-169675092
Thanks for the review @rmetzger.
I think this is not a problem, because the user cannot define restart
strategies. In order to set a `RestartStrategy`, the user has to provide a
`RestartStrategyConfiguration`. The `RestartStrategyConfiguration` cannot be
extended outside the `RestartStrategies` class so that the user cannot define
his own `RestartStrategyConfiguration`. Additionally, the strategy itself will
only be instantiated from this configuration on the `JobManager` via the
`RestartStrategyFactory`. This is also code which cannot be changed by the user
via the API.
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