Save task state info in the ctx for checkpoint #245
Merged
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The engine saves the task state in the
extras
so that it can be accessed from outside the engine. However, this will create a mismatch when the engine process is restored from a checkpoint.This PR saves the task state information in the context so that it can be restored from a checkpoint. The state info is also stored separately in the extras of the WorkGraph process node for each task so that we can query it. For the process node, we serialize it so that it can also be saved into the extras.
In order to interact with the running WorkGraph Engine, we need to use
rpc_send
to send a custom message to the engine.