Github user gengliangwang commented on the issue:
https://github.com/apache/spark/pull/21329
@rxin When I was implementing writer with Data Source V2, I find the code
in `HadoopMapReduceCommitProtocol` quite misleading.
The code here is just setting configuration `"mapreduce.job.id`
and`mapreduce.task.id` to some meaningless dummy value.
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