Github user gengliangwang commented on the issue:

    https://github.com/apache/spark/pull/20386
  
    @rdblue @cloud-fan @jose-torres thanks for the comments!
    I was trying to make the API compatible with `onTaskCommit(taskCommit: 
TaskCommitMessage)` in `FileCommitProtocol` possible. 
    The reason that I removed arguments in `commit` and `abort` is that these 
arguments seems redundant with the new API `add(WriterCommitMessage message)`.
    
    After consideration, I decide to take the suggestion from @jose-torres : 
create a new API for commit message call back, and remain the api `commit` and 
`abort` as what they were.
    
    Here is the new PR: https://github.com/apache/spark/pull/20454


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