[Improvement]: Flink optimizer configure managed memory explicitly in both the doc and the startup script

[wangtaohz]

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What would you like to be improved?

The current Flink optimizer mainly utilizes the heap memory of Task Manager, but Flink allocates around 50% of memory to managed memory by default, resulting in less heap memory available and increasing the risk of OOM issues for the Task Manager.

How should we improve?

To reduce the risk of OOM of Task Manager caused by unreasonable managed memory configuration, the configuration taskmanager.memory.managed.size should be explicitly specified in the doc and script of starting Flink optimizer.

And taskmanager.memory.managed.size=32mb may be a reasonable value.

The doc is here: https://github.com/NetEase/amoro/blob/master/docs/admin-guides/managing-optimizers.md#deploy-external-optimizer.

The startup script is here: com.netease.arctic.optimizer.FlinkOptimizerContainer#buildOptimizerStartupArgsString

Are you willing to submit PR?

• Yes I am willing to submit a PR!

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