Question about State machine of batch task and instance about clusterdata HOT 3 OPEN

I would try to clarify this by answering your questions:

so the "Waiting" tasks mean that they are waiting for other tasks finishing ?

No. A task is "Waiting" is because its relevant data is not initialized yet, e.g. determine the properties of task instances based on the plan issued by jobmaster; obtaining information about data locality, etc

In addition, I found that some instance reboot after it arrived at "Failed" status, but others not. Is there any mechanism for judging whether a instance should reboot?

There is a limitation on the times for an instance can reboot after failure. An instance will not try reboot again if any of the following conditions is met:

1. reach maximum reboot numbers
   OR
2. an explicit "unretry" signal is given

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@HaiyangDING
Thank you for your answer! I now know what task "Waiting" means. Then what is the state of the task when the task's dependence is not satisfied?

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Hi.
I want to know the explanation of the canceled state.And what are the 12 types of tasks?
I will appreciate if someone could help.

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