简单的wordcount程序，当设置了 env.setStateBackend(new RocksDBStateBackend(checkpointPath, true)); 就会报 Caused by: java.lang.IllegalArgumentException: The fraction of memory to allocate should not be 0. Please make sure that all types of managed memory consumers contained in the job are configured with a non-negative weight via `taskmanager.memory.managed.consumer-weights`. 查看源码是在 StreamConfig的 getManagedMemoryFractionOperatorUseCaseOfSlot 方法内，得到的是0.0 因为getAllManagedMemoryUseCases 返回的是0导致的。 因为config不存在一个key ： managedMemFraction.STATE_BACKEND 当我手动添加这个key就可以正常执行了。 执行代码如下： https://paste.ubuntu.com/p/9WrBz3Xrc6/
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