[Spread-users] very big lag when one spread daemon stopped

[John Schultz]

Sorry for the delayed response ...

Those timings do seem strange to me.  I would normally expect for there to 
be one very large lag when the membership breaks and reforms and then to 
immediately return to very quick delivery.

Can you explain the timings you took?  Do those numbers (e.g. - 1, 11802, 
11599, etc.) represent the # of ms since the last message delivery?

Are you sure that the daemon you kill isn't restarting/recrashing?

You can turn on the MEMBERSHIP debug flag to see if the daemon is flailing 
for some reason in reestablishing the membership.

The timeouts that control membership are set at the top of membership.c 
In particular you might want to lower the token timeout (how quickly 
broken rings are declared)

---
John Schultz
Spread Concepts
Phn: 443 838 2200

On Thu, 31 May 2007, Csaba Endre Simon wrote:

> Hi all,
>
> I am running the Spread daemon v4.0 on two different computer: Linux
> (10.1.0.44) and Solaris (10.1.0.51). On the Linux box I am running the
> TestSpreadClient and the TestSpreadSvr application:
>
> $ ./TestSpreadClient 1000
> $ ./TestSpreadSvr 1000 200 5000
>
> Here is the code
> http://commedia.cnds.jhu.edu/pipermail/spread-users/2004-November/002309.html
>
> When killing the daemon on the Solaris box (ctrl-c) there is a very
> big lag receiving the message:
>
> ...
> 25: 1
> 26: 1
> 27: 1
> 28: 1
> 29: 11802
> 30: 11599
> 31: 11396
> 32: 11193
> 33: 10989
> ...
> 83: 828
> 84: 625
> 85: 421
> 86: 218
> 87: 14
> 88: 1
> 89: 1
>
> As you see the daemon was stopped after sending message #28. Between
> #29-87 to receive one message takes a very big time. After some time
> (message #88) receiving messages come back to normal.
>
> My spread.conf is the following:
>
> Spread_Segment  10.1.0.255:4803 {
>   linux   10.1.0.44
>   solaris 10.1.0.51
> }
>
> What can be the error? What setting do I need to tune this time period?
>
> Best Regards,
> Csaba
>
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