Jim Showalter created HADOOP-15160:
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             Summary: Confusing text in 
http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/Compatibility.html
                 Key: HADOOP-15160
                 URL: https://issues.apache.org/jira/browse/HADOOP-15160
             Project: Hadoop Common
          Issue Type: Bug
          Components: documentation
            Reporter: Jim Showalter
            Priority: Minor


The text in wire formats, policy, is confusing.

First, there are two subsections with the same heading:

The following changes to a .proto file SHALL be considered incompatible:
The following changes to a .proto file SHALL be considered incompatible:

Second, one of the items listed under the first of those two headings seems 
like it is a compatible change, not an incompatible change:

Delete an optional field as long as the optional field has reasonable defaults 
to allow deletions



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