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From "Pete Wyckoff (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4109) FileSystem support for posix truncate method
Date Mon, 08 Sep 2008 04:04:44 GMT
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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