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"standby switchover": additional sanity checks

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Check that sufficient walsenders will be available on the promotion
candidate, and if replication slots are in use check if enough of
those will be available.

Note these checks can't guarantee that the walsenders/slots will
be available at the appropriate points during the switchover process,
but do ensure that existing configuration problems will be caught.

Implements GitHub #371.
This commit is contained in:
Ian Barwick
2018-02-08 12:04:54 +09:00
committed by Ian Barwick
parent 571e6b2783
commit ee2df36a76
4 changed files with 158 additions and 16 deletions
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4
dbutils.c
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@@ -2667,8 +2667,8 @@ get_node_replication_stats(PGconn *conn, int server_version_num, t_node_info *no
appendPQExpBuffer(&query,
" current_setting('max_replication_slots')::INT AS max_replication_slots, "
" (SELECT COUNT(*) FROM pg_catalog.pg_replication_slots) AS total_replication_slots, "
" (SELECT COUNT(*) FROM pg_catalog.pg_replication_slots WHERE active = TRUE) AS active_replication_slots, "
" (SELECT COUNT(*) FROM pg_catalog.pg_replication_slots WHERE active = FALSE) AS inactive_replication_slots, ");
" (SELECT COUNT(*) FROM pg_catalog.pg_replication_slots WHERE active IS TRUE) AS active_replication_slots, "
" (SELECT COUNT(*) FROM pg_catalog.pg_replication_slots WHERE active IS FALSE) AS inactive_replication_slots, ");
}