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From "Stefania (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-8952) Remove transient RandomAccessFile usage
Date Sat, 04 Apr 2015 00:17:33 GMT


Stefania commented on CASSANDRA-8952:

Thank you!

> Remove transient RandomAccessFile usage
> ---------------------------------------
>                 Key: CASSANDRA-8952
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Joshua McKenzie
>            Assignee: Stefania
>            Priority: Minor
>              Labels: Windows
>             Fix For: 3.0
> There are a few places within the code base where we use a RandomAccessFile transiently
to either grab fd's or channels for other operations. This is prone to access violations on
Windows (see CASSANDRA-4050 and CASSANDRA-8709) - while these usages don't appear to be causing
issues at this time there's no reason to keep them. The less RandomAccessFile usage in the
code-base the more stable we'll be on Windows.
> [SSTableReader.dropPageCache|]
> * Used to getFD, have FileChannel version
> [FileUtils.truncate|]
> * Used to get file channel for channel truncate call. Only use is in index file close
so channel truncation down-only is acceptable.
> [MMappedSegmentedFile.createSegments|]
> * Used to get file channel for mapping.
> Keeping these in a single ticket as all three should be fairly trivial refactors.

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