Обсуждение: loading data into cluster - can I daisy-chain streamingreplication?
I have an old production instance, let's call it A, that I need to decommission soon. I've created a pair of new instances, B and C, with B replicating to C, following this procedure: https://wiki.postgresql.org/wiki/Streaming_Replication But B and C have no data yet. I need to transfer all data from A into B. Can I daisy-chain streaming replication? In other words, temporarily setup replication like this: A ==> B ==> C And after the transfer is done, just remove A from the scheme. -- Florin Andrei http://florin.myip.org/
Unfortunately, no can not do what you have proposed because to make B a slave of A requires that you make binary copy ofA to B and then turn on replication from A to B which will break B to C replication. What you can do with your current configuration is do a pg_dumpall or pg_dump of A and load that logical dump into B whichwould then replicate the data to C. Dennis > On Dec 2, 2015, at 7:24 PM, Florin Andrei <florin@andrei.myip.org> wrote: > > I have an old production instance, let's call it A, that I need to decommission soon. > > I've created a pair of new instances, B and C, with B replicating to C, following this procedure: > > https://wiki.postgresql.org/wiki/Streaming_Replication > > But B and C have no data yet. I need to transfer all data from A into B. > > Can I daisy-chain streaming replication? In other words, temporarily setup replication like this: > > A ==> B ==> C > > And after the transfer is done, just remove A from the scheme. > > > -- > Florin Andrei > http://florin.myip.org/ > > > -- > Sent via pgsql-general mailing list (pgsql-general@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-general >
On 12/2/15 9:54 PM, Dennis wrote: > What you can do with your current configuration is do a pg_dumpall or pg_dump of A and load that logical dump into B whichwould then replicate the data to C. IF you can't handle the downtime you could also setup londiste or Slony and logically replicate A to B. But (assuming A and B are binary compatible) you'd be better off just breaking the B to C replication, setting B up as a replica of A, and then setting C up as a replica of B. -- Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX Experts in Analytics, Data Architecture and PostgreSQL Data in Trouble? Get it in Treble! http://BlueTreble.com