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From "Johan Oskarsson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-950) Cache BufferedRandomAccessFile.length
Date Sat, 03 Apr 2010 14:39:27 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12853143#action_12853143
] 

Johan Oskarsson commented on CASSANDRA-950:
-------------------------------------------

It's worth noting that with stress.py I don't actually see any increase in throughput on my
machine.

> 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
>
>
> 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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