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  84                   I have a trigger called the <i>Remove Empty Branch Trigger</i>:<br>
  85 <blockquote>
  86   <p><a  href="https://defaria.com/Resume/Clearcase/RemoveEmptyBranch.php">Remove
  87 Empty Branch Trigger</a>: This trigger removes the branch and the zero element that is left when a user checks out an element on a branch then cancels the checkout. Normally this causes a branch with only a zero element which is identical to the version from which it was branched. Essentially this empty branch is useless. This trigger prevents that.</p>
  88 </blockquote>
  89
  90 <p>Not only is this empty branch useless but:</p>
  91 <ul>
  92   <li>It clutters the version tree</li>
  93
  94   <li>Causes Clearcase to maintain more meta data, slowing down operations</li>
  95
  96   <li>Can cause additional work for UCM when you rebase</li>
  97 </ul>
  98
  99 <p>I'm experiencing that last bullet item right now. At one time I was attempting to do a delivery for somebody from another stream, first rebasing my stream. The delivery was unsuccessful and it was decided that this other engineer would work on it and deliver himself. So I canceled the delivery. One would think then that my view was relatively clean.</p>
 100
 101 <p>However now I want to deliver something else and I see this old rebase activity hanging around. In looking into the change set I notice a bunch of items from that older attempt at delivering. Why were these still hanging around? I had canceled that delivery right?</p>
 102
 103 <p>Well I believe the problem comes from having empty branches. Take for example the following:</p>
 104
 105 <p><img src="/blogs/images/RmEmptyBranch.png" alt=""></p>
 106
 107 <p>It shows a rebase from osaka/5 -&gt; defaria_osaka/1. Yet these two version compare to be the same! How did this happen? Well think about it. Prior to the rebase I had an empty branch (i.e. I had
 108 defaria_osaka/0 left over from the canceled delivery which merely did an unco). This means that osaka/4 and defaria_osaka/0 were identical. Then osaka/5 came into existance. Now 4 != 5 and when I rebase Clearcase has to propogate osaka/5 creating defaria_osaka/1. Now I have two identical versions and associate meta data and all for naught! Additionally I have a baseline lable on defaria_osaka/1 which give the air of importance to this unimportant version.</p>
 109
 110 <p>Had we had a remove empty branch trigger, when the delivery canceled, the unco would have left defaria_osaka/0 and the remove empty branch trigger would have removed the empty branch. Then my view would have been pointing to osaka/4 (and would have moved to osaka/5 if I were using .../osaka/LATEST and a dynamic view or updated to osaka/5 during the normal course of updating the view). Indeed, allowing empty branches to persist can cause developers to unknowingly get "stuck in
 111 time".</p>
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