[jira] Commented: (HADOOP-4109) FileSystem support for posix truncate method

["Owen O'Malley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-4109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12629638#action_12629638 ] 

Owen O'Malley commented on HADOOP-4109:
---------------------------------------

Clearly, in FileSystem, it would be better expressed as:

{code}
void truncate(Path path, long offset) throws IOException;
{code}

> FileSystem support for posix truncate method
> --------------------------------------------
>
>                 Key: HADOOP-4109
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4109
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: fs
>            Reporter: Pete Wyckoff
>
> from man truncate:
> {code}
>        int truncate(const char *path, off_t length);
> {code}
> 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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