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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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4
controldata.h
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@@ -24,6 +24,8 @@ typedef struct
DBState state;
XLogRecPtr checkPoint;
uint32 data_checksum_version;
TimeLineID timeline;
XLogRecPtr minRecoveryPoint;
} ControlFileInfo;
@@ -336,5 +338,7 @@ extern const char *describe_db_state(DBState state);
extern int get_data_checksum_version(const char *data_directory);
extern uint64 get_system_identifier(const char *data_directory);
extern XLogRecPtr get_latest_checkpoint_location(const char *data_directory);
extern TimeLineID get_timeline(const char *data_directory);
extern XLogRecPtr get_min_recovery_location(const char *data_directory);
#endif /* _CONTROLDATA_H_ */