Book.xml - adding section on Schema Design on versions
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                 Key: HBASE-3735
                 URL: https://issues.apache.org/jira/browse/HBASE-3735
             Project: HBase
          Issue Type: Improvement
            Reporter: Doug Meil
            Priority: Minor
         Attachments: book.xml.patch

Added section under Schema Design for "Number of Versions"

The fact that HBase doesn't overwrite values (but versions them by time) is one 
of those "obvious but not so obvious" topics, and it recently came up on the 
dist-list.  Added small description of why this is important to consider for 
schema design, link to HColumnDescriptor javadoc, with internal link to Data 
Model section.




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