Github user poornachandra commented on the issue:

    https://github.com/apache/incubator-tephra/pull/20
  
    Thanks for the review @anew. I've addressed the comments, please take 
another look.
    
    > Regarding correctness, my major concern is that the (min(max invalid), 
min(inProgress)-1) is not a safe bound for transaction that are guaranteed not 
to write any more.
    I have filed TEPHRA-199 to address this, I'll make the changes in the next 
PR.
    
    Do you have a suggestion for a better name for `pruneUpperBoundTime`? 
Basically this is an upper bound for transactions that are not active (i.e, can 
be still used for writing). 


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