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From "Sebb (JIRA)" <>
Subject [jira] [Resolved] (IO-278) Improve Tailer performance with buffered reads
Date Thu, 07 Jun 2012 20:58:23 GMT


Sebb resolved IO-278.

       Resolution: Fixed
    Fix Version/s: 2.4

Buffering was added as part of IO-332.
Added tests.
> Improve Tailer performance with buffered reads
> ----------------------------------------------
>                 Key: IO-278
>                 URL:
>             Project: Commons IO
>          Issue Type: Improvement
>    Affects Versions: 2.0.1
>            Reporter: Sergio Bossa
>             Fix For: 2.4
>         Attachments: Tailer.diff, TailerTest.diff
> I noticed Tailer read performances are pretty poor when dealing with large, frequently
written, log files, and this is due to the use of RandomAccessFile which does unbuffered reads,
hence causing lots of disk I/O.
> So I improved the Tailer implementation by introducing buffered reads: it works by loading
large (configurable) file chunks in memory, and reading lines from there; this enhances performances
in my tests from 10x to 30x depending on the file size.
> I also added two test cases: one to simulate reading of a large file (you can use it
to compare performances), the other to verify correct handling on buffer breaks; obviously,
all tests pass.
> I'm attaching the diff files, let me know if it's okay for you guys!

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