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From "Gary Dusbabek (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1117) Clean up MMAP support
Date Tue, 25 May 2010 18:12:24 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12871275#action_12871275
] 

Gary Dusbabek commented on CASSANDRA-1117:
------------------------------------------

I'm trying to see how these patches make Cassandra more awesome?  I think we've worked out
the bugs with mmap.  This seems like a big refactor that doesn't net us anything.

> 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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