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From GitBox <...@apache.org>
Subject [GitHub] mikewalch commented on a change in pull request #48: Added conditional writer to tour
Date Thu, 01 Jan 1970 00:00:00 GMT
mikewalch commented on a change in pull request #48: Added conditional writer to tour
URL: https://github.com/apache/accumulo-website/pull/48#discussion_r155803132
 
 

 ##########
 File path: tour/conditional-writer.md
 ##########
 @@ -1,3 +1,119 @@
 ---
 title: Conditional Writer
 ---
+
+When read-modify-write operations run concurrently, its possible changes made
+by some operations will be overwritten by others. The following sequence of
+events shows an example of this.
+
+ 1. Thread 0 sets the key `id0001:location:home` to `1007 Mountain Dr, Gotham, New York`
 
 Review comment:
   I think it would be easier to understand this example if the original address was `1007
Mountain Drive, Gotham, New York` and the threads are standardizing the address.
   
   * Thread 1 replaces `Drive` with `Dr`
   * Thread 2 replaces `New York` with `NY`

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