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cluster show: display timeline ID

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This helps provide a better picture of the state of the cluster, i.e.
making it more obvious whether there's been a timeline divergence.

This also provides infrastructure for further improvements in cluster
status display and diagnosis.

Note this is only available in PostgreSQL 9.6 and later as it relies
on the SQL functions for interrogating pg_control, which can be executed
remotely. As PostgreSQL 9.5 will shortly be the only community-supported
version without these functions, it's not worth the effort of trying
to duplicate their functionality.
This commit is contained in:
Ian Barwick
2019-05-27 09:15:12 +09:00
parent df6d160d2e
commit c560dfbbce
6 changed files with 133 additions and 23 deletions
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42
dbutils.h
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@@ -164,8 +164,28 @@ typedef struct s_extension_versions {
UNKNOWN_SERVER_VERSION_NUM \
}
typedef struct
{
char current_timestamp[MAXLEN];
bool in_recovery;
TimeLineID timeline_id;
XLogRecPtr last_wal_receive_lsn;
XLogRecPtr last_wal_replay_lsn;
char last_xact_replay_timestamp[MAXLEN];
int replication_lag_time;
bool receiving_streamed_wal;
bool wal_replay_paused;
int upstream_last_seen;
int upstream_node_id;
} ReplInfo;
/*
* Struct to store node information
* Struct to store node information.
*
* The first section represents the contents of the "repmgr.nodes"
* table; subsequent section contain information collated in
* various contexts.
*/
typedef struct s_node_info
{
@@ -199,6 +219,8 @@ typedef struct s_node_info
int total_replication_slots;
int active_replication_slots;
int inactive_replication_slots;
/* replication info */
ReplInfo *replication_info;
} t_node_info;
@@ -225,7 +247,8 @@ typedef struct s_node_info
/* for ad-hoc use e.g. when working with a list of nodes */ \
"", true, true, \
/* various statistics */ \
-1, -1, -1, -1, -1, -1 \
-1, -1, -1, -1, -1, -1, \
NULL \
}
@@ -338,19 +361,7 @@ typedef struct BdrNodeInfoList
0 \
}
typedef struct
{
char current_timestamp[MAXLEN];
bool in_recovery;
XLogRecPtr last_wal_receive_lsn;
XLogRecPtr last_wal_replay_lsn;
char last_xact_replay_timestamp[MAXLEN];
int replication_lag_time;
bool receiving_streamed_wal;
bool wal_replay_paused;
int upstream_last_seen;
int upstream_node_id;
} ReplInfo;
typedef struct
{
@@ -602,6 +613,7 @@ XLogRecPtr get_last_wal_receive_location(PGconn *conn);
void init_replication_info(ReplInfo *replication_info);
bool get_replication_info(PGconn *conn, t_server_type node_type, ReplInfo *replication_info);
int get_replication_lag_seconds(PGconn *conn);
TimeLineID get_node_timeline(PGconn *conn);
void get_node_replication_stats(PGconn *conn, t_node_info *node_info);
NodeAttached is_downstream_node_attached(PGconn *conn, char *node_name);
void set_upstream_last_seen(PGconn *conn, int upstream_node_id);