Clean up MMAP support
---------------------
Key: CASSANDRA-1117
URL: https://issues.apache.org/jira/browse/CASSANDRA-1117
Project: Cassandra
Issue Type: Improvement
Reporter: Stu Hood
Assignee: Jonathan Ellis
Fix For: 0.7
Attachments: 0001-Use-factory-functions-for-RowIndexedReader.patch,
0002-Add-SegmentedFile-to-abstract-opening-FileDataInputs.patch,
0003-Replace-mmap-file-abstraction-with-SegmentedFile.patch
Awareness of MMAP is currently embedded into the SSTableReader implementation
and IndexSummary. A good number of bugs experienced recently have been due to
this lack of separation, so it is ripe for abstraction. Additionally, the
current implementation does not provide a good method for iterating over the
segments of a file, which is useful for range queries, and lays more stable
groundwork for #998.
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