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Date: Thu, 23 May 2002 11:59:12 +0100 (BST)
Subject: Reply to: a question on delays on yahoogroup mails
To: agathiyar@yahoogroups.com
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From: Saravanan Kandasamy
X-Yahoo-Group-Post: member; u=9262959
X-Yahoo-Profile: svanan1
X-Yahoo-Message-Num: 18191
Dear Mr.Suresh,
The problem you and your fellow friends have faced
migh have caught the interest of some people in our
yahoogroup. The Yahoo Management should be the best
person to explain the truth behind the specific
scenario faced by members of YahooGroup but as someone
who have been doing much research in areas of Wired
and Wireless Communication I would be able to outline
the possibilities which could have caused the delay.
I would try to explain in much simpler way so that the
beginners in computer world could be able to
understand this.
Sending mails (i.e Webmail or POP3 mail) directly to
an individual(i.e abc@...) or to a group of
people aliased by a common email id(i.e
agathiyar@...) requires different amount of
processing time. The processing time here actually
means from the time the Sender clicks "Send" button to
the time it reaches the mailbox of the receiver.(We
normally neglect the processing time as it is in terms
of seconds)
On the process of transmission ,your actual mail would
be passed through a number of different components of
an internet including a number of gateways, DNS
Server,routers and etc. The whole network would appear
like a complex mesh net with these components taking
its position.
Assuming you are sending 2 mails to a single
recipient, the path taken to send mail 'A' might not
be the same as the path taken to send mail 'B' even
though the recipient are the same. There are no
'specific' path for a mail to be sent to a particular
person even though there are some algorithm which have
been created for 'best effort' path to be taken to
reduce the various forms of delays caused by the
length of path, or the delay caused by the time taken
by individual components (i.e gateways,routers etc.)
to process the mail and etc.
To further illustrate this , maybe mail 'A' (assuming
the sender is in Penang) went from Penang-Kuala
Lumpur-Japan-USA(been processed
there)-Bangkok-Singapore-Perak(Recipient).
Maybe mail 'B' went to Bangkok-USA(processed
there)-Perak(Recipient).
As I told earlier there are not specific path. You
might be wondering what is the major contributer to
the path taken by a mail. My answer would be -the
individual network components itself. Sometimes when
a mail arrives to a network component to be processed,
not all the time the components is available for
usage. Sometimes it is overloaded with other users
request thus it would be sent to another similar
components to be processed if there is a choice(more
like a football game).
If there are no choice to transfer the mail processing
to another network componet then it would have to wait
in queue till the particular component is ready to be
used.
So as in LSK's case the 'original' mail would have
experienced the worse case scenario (delays and
lengthy path) and the 'reply' mail would have faced
the average or best effort scenario. As I can stress
here the probability of this scenario to happen is
small. As I said earlier all of this processing is
done in terms of seconds. In real life waiting for a
few seconds would not change much but in computer
world specifically we could feel the problem as the
mails are changed in order (In LSK's case 'reply' mail
comes before 'original').
Maybe there would be a question why it happen so
frequent to YahooGroup mail than to a normal Yahoo
mail? Well sending a mail to Yahoo Group requires
double processing time (For easier illustration) then
the mail sent to an individual. The YahooGroups are
like you sent a mail to an individual and that
individual would sent the same mail to another 10
people seamless of his presence. So more problems can
happen in terms of path and delay.
With this I hope I have managed to give some light to
the scenario faced.
rgds
Saravanan
-------------------------------------
From: "L. Suresh Kumar-LSK"
Date: Sun May 19, 2002 6:09 pm
Subject: a question on delays on yahoogroup mails
friends
of late, both me and some friends of mine notice the
delays in
receiving mails from yahoogroups in general, not
specific to any
particular group.
sometimes, replies come in before one could read the
original
mail to which these replies were made.
does anyone have any idea on this ???
if one checks the inbox and the messages page of the
yahoogroup,
sometimes one notices that some mails did not come to
inbox (in
individual email mode).
yahoo underwent some changes. not sure what is causing
this.
suresh
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