[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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