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From "Terje Marthinussen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-47) SSTable compression
Date Tue, 12 Jul 2011 22:07:01 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-47?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13064184#comment-13064184
] 

Terje Marthinussen commented on CASSANDRA-47:
---------------------------------------------

Sparse files is indeed a filesystem feature.

It is standard in extfs, xfs and probably most of the common filesystems on linux (not considering
FAT :))
It is not standard in NTFS, but applications can enable sparse files on a file by file basis
there. But my bet, without checking, is that this is not really supported by java...

For OSX, it is not supported on HFS, but is supposedly supported on UFS (but I have not tested
on OSX, so only read this).

Anyway, I agree (from experience) stay away from using sparseness in files if possible. It's
a portability headache and it tends to cause major issues when it fails.



> SSTable compression
> -------------------
>
>                 Key: CASSANDRA-47
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-47
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Pavel Yaskevich
>              Labels: compression
>             Fix For: 1.0
>
>         Attachments: CASSANDRA-47.patch, snappy-java-1.0.3-rc4.jar
>
>
> We should be able to do SSTable compression which would trade CPU for I/O (almost always
a good trade).

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