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From "Pavel Yaskevich (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-2459) move SSTableScanner to use SSTableReader.dfile instead of BRAF
Date Thu, 28 Apr 2011 22:58:03 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-2459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pavel Yaskevich resolved CASSANDRA-2459.
----------------------------------------

    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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