Обсуждение: BDR: changing dsn on a running node
Hi
Is it possible to change the dsn connection string of a node without leaving the group? I couldn’t find the related documentation unfortunately.
We’re using BDR in a dynamic environment where the hostname/ip of a node may be changed any time. Leaving and rejoining the BDR group seems to be a solution but is a bit tedious and a slow process.
Natan
Hi
Is it possible to change the dsn connection string of a node without leaving the group? I couldn’t find the related documentation unfortunately.
We’re using BDR in a dynamic environment where the hostname/ip of a node may be changed any time. Leaving and rejoining the BDR group seems to be a solution but is a bit tedious and a slow process.
Natan
Hi, Just to say I did it with bdr 0.9.3 to change the password of the connection string.
I needed to manually modify the bdr.bdr_nodes and bdr.bdr_connections tables for all nodes but finally it works.
What I found strange is that the changes were not replicated automatically.
(Note there is a bdr.bdr_connections_changed() stored procedure, I am not sure this is needed, I did not use it)
My 2 cents,
Sylvain
On 12 October 2016 at 00:55, Sylvain MARECHAL <marechal.sylvain2@gmail.com> wrote: > Le 07/10/2016 à 23:54, Natan Abolafya a écrit : > > Is it possible to change the dsn connection string of a node without leaving > the group? I couldn’t find the related documentation unfortunately. > > We’re using BDR in a dynamic environment where the hostname/ip of a node may > be changed any time. Leaving and rejoining the BDR group seems to be a > solution but is a bit tedious and a slow process. You can update the bdr.bdr_connections entry and then kill the apply workers. Right now bdr.bdr_connections_changed() doesn't know to check for a changed DSN. I'd welcome a patch to address that, since I probably won't have time to get to it soon. We should have a bdr.bdr_connection_set_dsn(...) function, really. Again, a patch would be welcomed. -- Craig Ringer http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services