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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-1117) Clean up MMAP support
Date Tue, 25 May 2010 20:25:33 GMT


Jonathan Ellis commented on CASSANDRA-1117:

nor does this seem like a reduction in complexity overall; it just moves the complexity around.

> Clean up MMAP support
> ---------------------
>                 Key: CASSANDRA-1117
>                 URL:
>             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,
> 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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