dlmarion commented on PR #3200:
URL: https://github.com/apache/accumulo/pull/3200#issuecomment-1440274362

   >  if there is a watcher added for each extent, then on large systems that 
could be an incredible load placed on ZooKeeper that needs to be considered.
   
   Looking at the [implementation 
notes](https://github.com/apache/zookeeper/pull/1106#issue-501722487), it 
appears that there is only one watcher created on the server-side. It says:
   > PathParentIterator is the "meat" of the implementation. Rather than set 
watchers on every ZNode implied by a recursive watcher. WatchManager passes any 
paths it processes through PathParentIterator which iterates up each parent 
znode looking for watchers.


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