Make the reading half of compactions memory-efficient
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                 Key: CASSANDRA-847
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-847
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Stu Hood
            Priority: Critical
             Fix For: 0.7
         Attachments: 
0001-Add-structures-that-were-important-to-the-SSTableSca.patch, 
0002-Implement-most-of-the-new-SSTableScanner-interface.patch, 
0003-Rename-RowIndexedReader-specific-test.patch

This issue is the next on the road to finally fixing CASSANDRA-16. To make 
compactions memory efficient, we have to be able to perform the compaction 
process on the smallest possible chunks that might intersect and contend 
one-another, meaning that we need a better abstraction for reading from 
SSTables.

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