Re: Question about enhancements to the APPE command and a new CHECKSUM command

[Niklas Gustavsson <ni...@protocol7.com>]

On Wed, Oct 13, 2010 at 8:13 PM,  <Ba...@thomsonreuters.com> wrote:
> The application I am working with periodically appends a small amount of
> data at the end of a file. Over time, this file does become very large. We
> need a way to verify that the incremental data has been appended correctly.
> Therefore the need to checksum only recently appended part of the file is
> desirable. Of course checksum of the entire file will provide the same
> assurance. However, it is perceived to be sub-optimal if the file is very
> large and one needs to do it frequently (like hundreds of times a day).

Running MD5 over a file is normally very cheap. Please try the MD5
command in your case and see if it works out okay, I suspect it will.

/niklas

RE: Question about enhancements to the APPE command and a new CHECKSUM command

[Ba...@thomsonreuters.com]

Great. Will give it a try.

Thanks.

Bill

-----Original Message-----
From: Niklas Gustavsson [mailto:niklas@protocol7.com] 
Sent: Wednesday, October 13, 2010 1:38 PM
To: Sekhon, Bill (Legal)
Cc: ftpserver-users@mina.apache.org
Subject: Re: Question about enhancements to the APPE command and a new
CHECKSUM command

On Wed, Oct 13, 2010 at 8:13 PM,  <Ba...@thomsonreuters.com>
wrote:
> The application I am working with periodically appends a small amount
of
> data at the end of a file. Over time, this file does become very
large. We
> need a way to verify that the incremental data has been appended
correctly.
> Therefore the need to checksum only recently appended part of the file
is
> desirable. Of course checksum of the entire file will provide the same
> assurance. However, it is perceived to be sub-optimal if the file is
very
> large and one needs to do it frequently (like hundreds of times a
day).

Running MD5 over a file is normally very cheap. Please try the MD5
command in your case and see if it works out okay, I suspect it will.

/niklas