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From "Liyin Liang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IO-332) Improve tailer's reading performance
Date Fri, 01 Jun 2012 05:31:25 GMT

     [ https://issues.apache.org/jira/browse/IO-332?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Liyin Liang updated IO-332:
---------------------------

    Attachment: IO-332-1.diff

Attach a diff file. This diff re-writes the Tailer.readLines() method. With this diff, the
reading performance can improve 100X.
                
> Improve tailer's reading performance
> ------------------------------------
>
>                 Key: IO-332
>                 URL: https://issues.apache.org/jira/browse/IO-332
>             Project: Commons IO
>          Issue Type: Improvement
>            Reporter: Liyin Liang
>         Attachments: IO-332-1.diff
>
>
> Now, Tailer triggers a lot of calls to the underlying runtime system, that is, RandomAccessFile.read(),
a native method that returns the next byte of the file. This approach is too slow to meet
our need. The performance can be improved by using a large buffer, that is using RandomAccessFile.read(byte[]).
Then Tailer only rarely accesses the underlying system.

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