ShuffleManager and Speculative Execution

[Enrico Minack]

Hi Spark devs,

I have a question around ShuffleManager: With speculative execution, one 
map output file is being created multiple times (by multiple task 
attempts). If both attempts succeed, which is to be read by the reduce 
task in the next stage? Is any map output as good as any other?

Thanks for clarification,
Enrico


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