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From "Johan Oskarsson (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-950) Cache BufferedRandomAccessFile.length
Date Tue, 06 Apr 2010 11:31:33 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-950?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Johan Oskarsson updated CASSANDRA-950:
--------------------------------------

    Attachment: CASSANDRA-950.patch

Updated patch that caches the length on init for read only files.

Updated if ( position. My brain doesn't even notice if there is a space between if and (.
I think I'm used to and prefer not having a space before ( since that's the norm after method
names.

> Cache BufferedRandomAccessFile.length
> -------------------------------------
>
>                 Key: CASSANDRA-950
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-950
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Johan Oskarsson
>         Attachments: CASSANDRA-950.patch, CASSANDRA-950.patch
>
>
> Profiling shows that BufferedRandomAccessFile.length is eating up an unexpected amount
of cpu. It believe it is the call through the "native barrier" that is causing it. We often
call the length method via is end of file when reading data. We can add caching of the file
length to avoid this call most times.

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