Github user srowen commented on the issue:

    https://github.com/apache/spark/pull/22572
  
    Is the value logged here always null?
    I am not sure if it's meaningful to log mapreduce.job.id, especially given 
its name. If there's no meaningful job ID here do we are about it at all? how 
about deleting the log?
    `SparkHadoopWriter` does something similar.


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