[Spread-users] high u-retrans
Qiangning Hong
hongqn at gmail.com
Fri Apr 25 06:12:35 EDT 2008
the configuration is pretty simple: 3 servers connected into one
switcher. /etc/spread.conf is simple, too:
Spread_Segment 192.168.1.255:4803 {
arwen 192.168.1.2
sam 192.168.1.5
legolas 192.168.1.7
}
We fed web server logs (~150 lines per seconds) into a spread group,
but it seems spread is too slow to handle them. One of the servers
has a high retrans rate (~50%, almost all are u-retrans):
============================
Status at sam V 4.00. 0 (state 1, gstate 1) after 1942 seconds :
Membership : 3 procs in 1 segments, leader is arwen
rounds : 21264 tok_hurry : 4828 memb change: 1
sent pack: 7448 recv pack : 28187 retrans : 17815
u retrans: 17768 s retrans : 47 b retrans : 0
My_aru : 54396 Aru : 54396 Highest seq: 54396
Sessions : 9 Groups : 1 Window : 60
Deliver M: 36379 Deliver Pk: 54396 Pers Window: 15
Delta Mes: 69 Delta Pack: 134 Delta sec : 10
==================================
However the other two seems ok.
============================
Status at legolas V 4.00. 0 (state 1, gstate 1) after 1989 seconds :
Membership : 3 procs in 1 segments, leader is arwen
rounds : 21772 tok_hurry : 4976 memb change: 2
sent pack: 28721 recv pack : 7541 retrans : 8
u retrans: 8 s retrans : 0 b retrans : 0
My_aru : 54984 Aru : 54984 Highest seq: 54984
Sessions : 13 Groups : 1 Window : 60
Deliver M: 36725 Deliver Pk: 55078 Pers Window: 15
Delta Mes: 80 Delta Pack: 150 Delta sec : 10
==================================
============================
Status at arwen V 4.00. 0 (state 1, gstate 1) after 2034 seconds :
Membership : 3 procs in 1 segments, leader is arwen
rounds : 22049 tok_hurry : 5353 memb change: 3
sent pack: 2 recv pack : 43106 retrans : 10
u retrans: 10 s retrans : 0 b retrans : 0
My_aru : 55426 Aru : 55426 Highest seq: 55426
Sessions : 0 Groups : 1 Window : 60
Deliver M: 36946 Deliver Pk: 55520 Pers Window: 15
Delta Mes: 84 Delta Pack: 159 Delta sec : 10
==================================
Anybody knows why?
--
Qiangning Hong
http://www.douban.com/people/hongqn/
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