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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-408) Pool BufferedRandomAccessFile objects used by sstable reads
Date Wed, 30 Dec 2009 21:26:29 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-408?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-408:
-------------------------------------

    Attachment:     (was: 0003-productize-mmap-approach-handle-files-2GB-by-chunking-.txt)

> Pool BufferedRandomAccessFile objects used by sstable reads
> -----------------------------------------------------------
>
>                 Key: CASSANDRA-408
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-408
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Chris Goffinet
>             Fix For: 0.9
>
>         Attachments: 0001-add-FileDataInput-implemented-by-BufferedRandomAccessF.txt,
0002-Implement-FileDataInput-with-MappedFileDataInput-backe.txt, 0003-productize-mmap-approach-handle-files-2GB-by-chunking-.txt,
408.patch, commons-pool-1.5.2.jar
>
>
> not only does BRAF per op do a whole lot of extra fopens, but the buffering actually
makes it _more_ expensive to set up since on the jvm all primitive arrays are initialized
to zero.
> this adds a simple read test to stress.py; I'm seeing about a 10% increase in throughput
which is worth 200loc imo.

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