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https://issues.apache.org/jira/browse/HADOOP-4109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Nauroth resolved HADOOP-4109.
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Resolution: Duplicate
Truncate has been implemented, tracked in HDFS-3107.
> FileSystem support for posix truncate method
> --------------------------------------------
>
> Key: HADOOP-4109
> URL: https://issues.apache.org/jira/browse/HADOOP-4109
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs
> Reporter: Pete Wyckoff
>
> {code}
> void truncate(Path path, long offset) throws IOException;
> {code}
> from man truncate:
> DESCRIPTION
> The truncate and ftruncate functions cause the regular file named by
> path or referenced by fd to be truncated to a size of precisely length bytes.
> If the file previously was larger than this size, the extra data is
> lost. If the file previously was shorter, it is extended, and the extended
> part reads as zero bytes.
> The file pointer is not changed.
> If the size changed, then the ctime and mtime fields for the file are
> updated, and suid and sgid mode bits may be cleared.
> With ftruncate, the file must be open for writing; with truncate, the
> file must be writable.
> RETURN VALUE
> On success, zero is returned. On error, -1 is returned, and errno is
> set appropriately.
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