[Spread-users] Leave membership and Re:Small Help!!

[Abhishek Sipani]

Whoa!!Changing a single parameter of MAX_PRIVATE_NAME alone does not resolve
this issue.It complicates it further as there are a lot of dependencies
involved as well. Anyway, will do with a size of 10 for now and try to do
soemthing like mapping the application-specific name as Jonathan suggested.

As i was looking into this matter another sprang up.This has been discussed
previously but no concrete solution offered yet. When i do a self leave, the
receive buffer in sp_receive()contains junk value. Only the sender contains
the name of the group that is being exited. Will i not be able to get the
private_group(even in truncated format)of the user who has left the group?
Am using 3.17.3 library.
Thanks and Regards,

Abhishek Sipani,
Blue Star Infotech.
Phone:(o)-91-22-569 56969
      (direct)-91-22-569 56966
      (m)    98204 51504
--------------------------------------------
"When Life offers you Lemons, Learn to make Lemonade"


-----Original Message-----
From: Jonathan Stanton [mailto:jonathan at cnds.jhu.edu]
Sent: Thursday, November 25, 2004 12:01 PM
To: Abhishek Sipani
Cc: spread-users at lists.spread.org
Subject: Re: [Spread-users] Small Help Needed


Hi,

If you search the spread-users mailing list archives you should find a
discussion from a year or so ago about how to increase the size of
private names (and group names).

My memory (which may not be perfect :-)) was that it did work to have
larger names with the correct header changes, but some limitations still
existed.

At minimum it requires changing the constants in the spread_params.h
header file and recompiling the daemon and all libraries.

Note, since the size of a private name or group also impacts the size of
a group membership list and other internal datastructures you may find
other constants also have to be raised --and/or the size of a membership
that can be supported may decrease as each member now needs more memory
and requires more data in each network packet.

One alternate solution that has been done before is to map the long
'application specific' names to shorter spread names (like integers, or
strings+numerical counter) since you won't have more then 100k clients
connected ever (given number of connections and daemon limits) you can
fit unique names in 10 bytes easily.

Cheers,

Jonathan

On Thu, Nov 25, 2004 at 11:03:14AM +0530, Abhishek Sipani wrote:
>
> Thanks for the response ryan. Am using 3.17.3 library and making use of
the
> sp.h and its associated files. I tried changing the MAX_PRIVATE_NAME
column
> to 100 and then make the call to sp_connect. Still the message gets
> truncated. Am i missing something here?What other changes do i have to
force
> on the daemon source code.
> Thanks and Regards,
> Abhishek Sipani,
> Blue Star Infotech.
> Phone:(o)-91-22-569 56969
>       (direct)-91-22-569 56966
>       (m)    98204 51504
> --------------------------------------------
> "When Life offers you Lemons, Learn to make Lemonade"
>
>
> -----Original Message-----
> From: Ryan Caudy [mailto:rcaudy at gmail.com]
> Sent: Thursday, November 25, 2004 9:54 AM
> To: abhisheks at bsil.com
> Cc: spread-users at lists.spread.org
> Subject: Re: [Spread-users] Small Help Needed
>
>
> I don't know the specific Spread library that your using... is it a
> wrapper around the C version, or a port?  Regardless, the maximum
> length of the private name associated with a Spread connection/mailbox
> is 10, without changing definitions in the daemon source code.
>
> Cheers,
> Ryan
>
>
> On Wed, 24 Nov 2004 19:23:23 +0530, Abhishek Sipani <abhisheks at bsil.com>
> wrote:
> > Hi,
> > I have been using spread for some research purpose. Would like to know
if
> > there is an upper limit on the UserName character length i provide..
> > i.e.
> > I do
> >         sprintf(Spread_name,"4803 at 192.168.11.40");
> >         int ret_val_connect;
> >         m_User.GetWindowText(User,80);
> >         ret_val_connect=sp.Connect(Spread_name,User);
> >         if(ret_val_connect<0)
> >                 AfxMessageBox("Unable to Connect");
> >         else
> >                 AfxMessageBox("Connected");
> >
> > this works fine..but if i provide a length more than 10 characters say
> > "ABCDEFGHIJKLM" as user name the call
> >         ret_val_connect= SP_connect(in_SpreadName, in_ConnectionName, 0,
> 1,
> > &m_Mbox, m_PrivateGroup );
> > returns m_PrivateGroup as "#ABCDEFGHIJ#SpreadMachineName"
> >
> > How do i prevent this from getting truncated?Have tried going through
the
> > enormous archives of discussions but of no avail. Please advice as i am
> > dealing with data that have names far greater than 10 characters. Am
> > relatively new to spread so some help here will be of immense help.
> >
> > Abhishek Sipani,
> > Blue Star Infotech.
> > Phone:(o)-91-22-569 56969
> >       (direct)-91-22-569 56966
> >       (m)    98204 51504
> > --------------------------------------------
> > "When Life offers you Lemons, Learn to make Lemonade"
> >
> > _______________________________________________
> > Spread-users mailing list
> > Spread-users at lists.spread.org
> > http://lists.spread.org/mailman/listinfo/spread-users
> >
>
>
> --
> ---------------------------------------------------------------------
> Ryan W. Caudy
> <rcaudy at gmail.com>
> ---------------------------------------------------------------------
> Bloomberg L.P.
> <rcaudy1 at bloomberg.net>
> ---------------------------------------------------------------------
> [Alumnus]
> <caudy at cnds.jhu.edu>
> Center for Networking and Distributed Systems
> Department of Computer Science
> Johns Hopkins University
> ---------------------------------------------------------------------
>
>
> _______________________________________________
> Spread-users mailing list
> Spread-users at lists.spread.org
> http://lists.spread.org/mailman/listinfo/spread-users

--
-------------------------------------------------------
Jonathan R. Stanton         jonathan at cs.jhu.edu
Dept. of Computer Science
Johns Hopkins University
-------------------------------------------------------