Github user andrewor14 commented on the pull request:

    https://github.com/apache/spark/pull/1222#issuecomment-67561129
  
    Maybe I'm missing something, but I don't see why it's difficult to store 
the metadata in plain text. In fact, isn't it necessary to store it in plain 
text in case we use a special compression codec? Otherwise we can't even 
determine the correct codec to decode the rest of the file. Can we do something 
like the following:
    
    Keep doing `readline()` until we the line equals the header end marker. We 
treat all the lines read so far as metadata in the form `k=v`, which we can 
just split on `=`. Then, as soon as we read the header end marker, we stop and 
pass the input stream to `ReplayListenerBus#replay`, wrapping it in a 
compression stream if necessary.


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