keith-turner opened a new pull request, #4909:
URL: https://github.com/apache/accumulo/pull/4909

   Registering cleaners takes up resources and currently bumps into a global 
lock. The native map code is registering a cleaner for iterators, even in the 
case where the native code did not allocate an iterator. This code is called 
very frequently by scan threads.
   
   This change does not register the cleaner in the case where the native code 
did not allocate a native iterator.  This should cause less contention between 
scan threads that are unrelated to each other.


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