Error message duplication in parallel mode

[dmpetrov]

Description

DC prints error message for each process which ruins user experience.

From quick start:

chain = (
   DataChain.from_storage("gs://datachain-demo/chatbot-KiT/",
                          object_name="file", type="text")
   .settings(parallel=8, cache=True)
   .map(is_positive=is_positive_dialogue_ending)
   .save("file_response")
)

I think, it's ok to show only one message even in cases when the messages might not match (different errors). User can fix the errors one by one.

Version Info

[ricor07]

Hello, I'd like to work on the project by fixing this issue. Can you assign this to me? Thanks