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Support connection load balancing in libpq

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This adds support for load balancing connections with libpq using a
connection parameter: load_balance_hosts=<string>. When setting the
param to random, hosts and addresses will be connected to in random
order. This then results in load balancing across these addresses and
hosts when multiple clients or frequent connection setups are used.

The randomization employed performs two levels of shuffling:

  1. The given hosts are randomly shuffled, before resolving them
     one-by-one.
  2. Once a host its addresses get resolved, the returned addresses
     are shuffled, before trying to connect to them one-by-one.

Author: Jelte Fennema <postgres@jeltef.nl>
Reviewed-by: Aleksander Alekseev <aleksander@timescale.com>
Reviewed-by: Michael Banck <mbanck@gmx.net>
Reviewed-by: Andrey Borodin <amborodin86@gmail.com>
Discussion: https://postgr.es/m/PR3PR83MB04768E2FF04818EEB2179949F7A69@PR3PR83MB0476.EURPRD83.prod.outlook.
This commit is contained in:
Daniel Gustafsson
2023-03-29 21:53:38 +02:00
parent 44d85ba5a3
commit 7f5b19817e
10 changed files with 431 additions and 3 deletions
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src/tools/pgindent/typedefs.list
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@@ -1705,6 +1705,7 @@ PGFileType
PGFunction
PGLZ_HistEntry
PGLZ_Strategy
PGLoadBalanceType
PGMessageField
PGModuleMagicFunction
PGNoticeHooks