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https://issues.apache.org/jira/browse/CASSANDRA-1117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12871340#action_12871340
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Jonathan Ellis commented on CASSANDRA-1117:
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something's wrong if introducing more mmap-ing reduces performance.
> 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: Gary Dusbabek
> 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,
> 0004-Rename-SSTableReaderTest-to-SegmentedFileTest.patch,
> 0005-Remove-filename-munging.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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