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https://issues.apache.org/jira/browse/IO-329?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gary D. Gregory resolved IO-329.
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Resolution: Fixed
Fix Version/s: 2.4
Committed revision 1343253.
> FileUtils.writeLines uses unbuffered IO
> ---------------------------------------
>
> Key: IO-329
> URL: https://issues.apache.org/jira/browse/IO-329
> Project: Commons IO
> Issue Type: Bug
> Components: Streams/Writers
> Affects Versions: 2.3
> Reporter: Vitalii Tymchyshyn
> Fix For: 2.4
>
>
> FileUtils.writeLines looks like next:
> out = openOutputStream(file, append);
> IOUtils.writeLines(lines, lineEnding, out, encoding);
> openOutputStream opens plain FileOutputStream without any buffering and
> IOUtils.writeLines does not add abyt buffering. This means each line require
> 2 write syscalls (one for the line and one for line separator). This makes
> call very slow, especially for short lines
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