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"standby follow": verify status of follow target

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This commit adds infrastruture for repmgr to be able to check
whether one standby can attach to another node, regardless whether
it is a standby or a primary.

This is intended to prevent a node from attempting to follow a
node whose timeline has diverged. The --dry-run option makes
it possible to test a follow operation before it is carried out.

As a useful side-effect this makes it possible for a standby to
follow another standby.

This is an initial implementation; documentation and possibly
further changes to follow.
This commit is contained in:
Ian Barwick
2018-11-29 17:14:38 +09:00
parent c53782cda3
commit 9e90fcd584
5 changed files with 355 additions and 97 deletions
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2
repmgr-action-standby.h
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@@ -28,7 +28,7 @@ extern void do_standby_switchover(void);
extern void do_standby_help(void);
extern bool do_standby_follow_internal(PGconn *primary_conn, t_node_info *primary_node_record, PQExpBufferData *output, int *error_code);
extern bool do_standby_follow_internal(PGconn *primary_conn, PGconn *follow_target_conn, t_node_info *follow_target_node_record, PQExpBufferData *output, int *error_code);