hbase book - laundry list of changes (8-6-2011)
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                 Key: HBASE-4172
                 URL: https://issues.apache.org/jira/browse/HBASE-4172
             Project: HBase
          Issue Type: Improvement
            Reporter: Doug Meil
            Assignee: Doug Meil
            Priority: Minor
         Attachments: docbkx_HBASE_4172.patch

Laundry list of changes:

* added to 'no reducer' sub-section in performance chapter that it doesn't 
apply when doing summarization and when the reducer doing the writing.
* new sub-section in config section about manually managed major compactions.  
we never actually had that anywhere in the book, although everybody does it.
* arch/client - new sub-section of htablepool for high-concurrency situations.
* sub-section under 'supported datatypes' for counters (although people use 
this feature a lot, it's not in any of the docs)
* fixed typo in arch/client (changed -ROOT to -ROOT-)
* added more in developing hbase section (more on code-style, added a codelines 
sub-section, and a few other nits).


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