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Posted to commits@cassandra.apache.org by "Pavel Yaskevich (JIRA)" <ji...@apache.org> on 2011/04/29 00:58:03 UTC
[jira] [Resolved] (CASSANDRA-2459) move SSTableScanner to use
SSTableReader.dfile instead of BRAF
[ https://issues.apache.org/jira/browse/CASSANDRA-2459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Pavel Yaskevich resolved CASSANDRA-2459.
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Resolution: Won't Fix
> move SSTableScanner to use SSTableReader.dfile instead of BRAF
> --------------------------------------------------------------
>
> Key: CASSANDRA-2459
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2459
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Pavel Yaskevich
> Assignee: Pavel Yaskevich
> Priority: Minor
> Fix For: 1.0
>
>
> That can give us the following benefits:
> a). don't need to skip a cache because we will be operating on memory mappings
> b). better performance (not copying data between kernel and user buffers as effect gained from using memory mapped segments, avoiding time operating on the kernel mode (+ time for switching context and read-ahead pressure) which BRAF involves)
> c). less impact on the live-reads
> d). less garbage will be created
> e). less file descriptors opened
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