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A litte doubt about the usage of checkpointLock

Hi, community

I see the checkpointLock is used in StreamTask to ensure that we don't have
concurrent method calls that void consistent checkpoints.

As i known, it is used in the data consume , state interactive and the
timerService, But I am doubt that, if an application don't enable the
checkpoint, it still have to deal with the checkpointLock. Is it necessary ? 

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