Revision to HBase book, more examples in data model, more metrics, more 
performance 
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                 Key: HBASE-3655
                 URL: https://issues.apache.org/jira/browse/HBASE-3655
             Project: HBase
          Issue Type: Improvement
            Reporter: Doug Meil
            Priority: Minor


This is a large-ish change to the HBase book

- moving the 'data model' section forward in the book (before schema design)

- adding some short API example snippets in 'data model' that illustrate the 
points discussed

- correcting a minor formatting issue in my last patch with pre-creating 
regions.

- included a listing of the region-server metrics
** however, I would like a one of the commiters to comment on what some of 
these are.

- Expanded MapReduce example
-- added a few short example snippets

- Expanded the performance section
-- some of which was simply referencing other configuration topics brought up 
elsewhere that are certain to cause people performance problems if 
mis-configured.
-- a few client examples of things that can cause performance problems if not 
used properly.



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