mongos: config servers order matter?

[V]

Hello

We are using 3 config servers in sharding cluster: config1, config2, config3

mongos running on application side connecting to configs with --configdb config1:27123,config2:27123,config3:27123

all instances runing mongo v.2.0.3 

the system was running fine but suddenly mongos started erroring with

[root@mongos-server ~]# mongo localhost:27123/db -uuname -ppassword 

connecting to: localhost:27123/db

Fri Mar 30 23:16:45 uncaught exception: login failed

exception: login failed

[root@mongos-server ~]#  

i run dbhash over all 3 configs to check if they are synced. hashes were the same for all configs.

i tried to restart mongos. configs. one more recheck... sync was ok, but error still there.

then i changed configs order in mongos --configdb config2:27123,config1:27123,config3:27123

and was able to connect successfully

so the question is - do config servers order matter on mongos? or it's some kind of bug?

thanks

v

[Scott Hernandez]

The order matters, and you must us the same string basically.

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[V]

hi Scott

where the most actual order of configs can be found which mongos should using?

i changed configs order to fix above problem. but first ordering (1,2,3) working good for few weeks. which is strange because servers were synced ok.

 --configdb config1:27123,config2:27123,config3:27123 

 --configdb config2:27123,config1:27123,config3:27123 

thanks

v

Субота, 31 березня 2012 р., 10:25:33 UTC+3 користувач Scott Hernandez написав:

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[Scott Hernandez]

You need to use the same order everywhere. That is how the order is
important; there is not any predefined order you must use.

2012/3/31 V <shum...@gmail.com>:

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[Vasyl Shumskyi]

You should just replace DNS / local mongoses resolvers of C1 - that's the easiest approach

Thanks,

Vasyl

2013/5/25 Tung Nguyen <tu...@misfitwearables.com>

Hi Scott,

Thanks for the answers

Could you please take a look at this case:

* Let's say, we have 3 config servers: C1, C2, C3

* 3 mongos servers: M1, M2, M3. Each mongos server has the same order of config servers as C1 -> C2 -> C3

* One day C1 (or whichever config server) goes down. We replace it by C4. So now we have: C4, C2, C3

Question #1: Do the 3 mongos servers (with their old order of config server C1 -> C2 -> C3) still work?

Question #2: Are the 3 mongos servers able to be updated their list from C1 -> C2 -> C3 to C4 -> C2 -> C3? That will happen automatically or we have to do it manually?

Question #3: If we add a new mongos server, let's call M4, with new order of config servers (C4 -> C2 -> C3), is there any problem with the whole cluster?

Thank you in advance :)

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