Le 27/05/2017 à 08:49, Willy Tarreau a écrit :
Hi Maxime,
On Fri, May 19, 2017 at 02:28:40PM +0200, Maxime Guillet wrote:
2/ If I launch the same test on both haproxy servers and peers
configuration activated, I can see the conn_cur counter always increasing
$ ab -n 2000 -c 20 http://10.0.0.2/
$ ab -n 2000 -c 20 http://10.0.0.3/
haproxy1# echo "show table http" | socat stdio
/var/run/haproxy/haproxy.stats
# table: http, type: ip, size:512000, used:1
0x7f59d568b9a0: key=10.10.10.10 use=20 exp=7285 conn_rate(10000)=225
conn_cur=47
0x7f59d568b9a0: key=10.10.10.10 use=20 exp=5337 conn_rate(10000)=213
conn_cur=52
0x7f59d568b9a0: key=10.10.10.10 use=20 exp=7952 conn_rate(10000)=178
conn_cur=133
0x7f59d568b9a0: key=10.10.10.10 use=20 exp=9589 conn_rate(10000)=218
conn_cur=259
0x7f59d568b9a0: key=10.10.10.10 use=20 exp=6144 conn_rate(10000)=143
conn_cur=321
0x7f59d568b9a0: key=10.10.10.10 use=20 exp=8115 conn_rate(10000)=190
conn_cur=553
0x7f59d568b9a0: key=10.10.10.10 use=20 exp=7815 conn_rate(10000)=180
conn_cur=676
0x7f59d568b9a0: key=10.10.10.10 use=20 exp=7285 conn_rate(10000)=162
conn_cur=738
=> the conn_cur information becomes more and more higher, while it should
be at maximum 40 (2 x 20 concurrent connection with ab)
I don't believe this behavior is intended, it seems more to be a bug.
Well, yes and no. The principle of stick table synchronization is primarily
for stickiness and secondarily for active-backup table replication, so the
last which pushes a value should overwrite the previous one. In that sense,
it's expected that the values you find are around 20. What you're seeing
still makes me think it's a bug (since it sounds like we're adding up some
values here), but I don't know if it's a side effect of the update or not.
Specifically it's possible that this replication would prevent a session
from decrementing its reference on close for example. It could also be a
stupid copy-paste of the conn_cnt replication, which would then be wrong.
At first glance what I'm seeing in the code looks like a simple replication
so I can't explain how what you're seeing happens for now :-/
Willy
Hi willy,
i found this topic because we have exactly the same problem , conn_cur
increasing endlessly when peers are activated. ( HA-Proxy version
1.7.9-1~bpo8+1 )
We use it for rate limiting purpose but from what i read it's a bad idea
after all, i thought that stick table were synchronised like this :
Server A [ conn_cur = 10 ], Server B [ conn_cur = 20 ], with peers =>
Server A [ conn_cur = 30 ], Server B [ conn_cur = 30 ]
But from what you write ( in fact it's in the documentation too ) it
seems that A overwrite B, or B overwrite A so it's impossible to use it
for rate limiting purpose.( i certainly don't want a [ conn_cur = 10 ]
overwriting a [ conn_cur = 20 ] )
Am i right ?
Thanks
