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Posted to common-dev@hadoop.apache.org by "Pete Wyckoff (JIRA)" <ji...@apache.org> on 2008/09/08 06:04:44 UTC
[jira] Created: (HADOOP-4109) FileSystem support for posix truncate
method
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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[jira] Updated: (HADOOP-4109) FileSystem support for posix truncate
method
Posted by "Pete Wyckoff (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-4109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Pete Wyckoff updated HADOOP-4109:
---------------------------------
Description:
{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.
was:
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.
> 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
>
> {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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[jira] Commented: (HADOOP-4109) FileSystem support for posix
truncate method
Posted by "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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