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interim commit

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This commit is contained in:
Ian Barwick
2017-06-28 17:28:20 +09:00
parent ded8d95e5a
commit f4e8bf891d
4 changed files with 65 additions and 16 deletions
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11
dbutils.c
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@@ -2292,14 +2292,13 @@ int request_vote(PGconn *conn, int this_node_id, int this_node_priority, XLogRec
{
PQExpBufferData query;
PGresult *res;
int vote;
int lsn_diff;
initPQExpBuffer(&query);
appendPQExpBuffer(&query,
"SELECT repmgr.request_vote(%i, %i, '%X/%X'::pg_lsn)",
"SELECT repmgr.request_vote(%i, '%X/%X'::pg_lsn)",
this_node_id,
this_node_priority,
(uint32) (last_wal_receive_lsn >> 32),
(uint32) last_wal_receive_lsn);
@@ -2307,10 +2306,12 @@ int request_vote(PGconn *conn, int this_node_id, int this_node_priority, XLogRec
termPQExpBuffer(&query);
vote = (strcmp(PQgetvalue(res, 0, 0), "t") == 0) ? 1 : 0;
lsn_diff = atoi(PQgetvalue(res, 0, 0));
log_debug("XXX lsn_diff %i", lsn_diff);
PQclear(res);
return vote;
return lsn_diff;
}

8
repmgr--4.0.sql
View File

@@ -34,11 +34,15 @@ CREATE VIEW show_nodes AS
LEFT JOIN nodes un
ON un.node_id = n.upstream_node_id;
CREATE FUNCTION request_vote(int) RETURNS boolean
/* repmgrd functions */
CREATE FUNCTION request_vote(INT, pg_lsn)
RETURNS INT
AS '$libdir/repmgr', 'request_vote'
LANGUAGE C STRICT;
CREATE FUNCTION get_voting_status() RETURNS int
CREATE FUNCTION get_voting_status()
RETURNS INT
AS '$libdir/repmgr', 'get_voting_status'
LANGUAGE C STRICT;

45
repmgr.c
View File

@@ -18,8 +18,16 @@
#include "storage/shmem.h"
#include "storage/spin.h"
#include "utils/builtins.h"
#include "utils/pg_lsn.h"
#include "utils/timestamp.h"
#include "executor/spi.h"
#include "lib/stringinfo.h"
#include "access/xact.h"
#include "utils/snapmgr.h"
#include "pgstat.h"
#include "voting.h"
#define MAXFNAMELEN 64
@@ -137,11 +145,42 @@ repmgr_shmem_startup(void)
Datum
request_vote(PG_FUNCTION_ARGS)
{
uint32 node_id = PG_GETARG_INT32(0);
/* node_id used for logging purposes */
int requesting_node_id = PG_GETARG_INT32(0);
XLogRecPtr requesting_node_last_lsn = PG_GETARG_LSN(1);
StringInfoData query;
elog(INFO, "id is %i", node_id);
int ret;
bool isnull;
PG_RETURN_BOOL(true);
int lsn_diff;
elog(INFO, "id is %i, lsn: %X/%X",
requesting_node_id,
(uint32) (requesting_node_last_lsn >> 32),
(uint32) requesting_node_last_lsn);
SPI_connect();
initStringInfo(&query);
appendStringInfo(
&query,
"SELECT '%X/%X'::pg_lsn - pg_catalog.pg_last_wal_receive_lsn()::pg_lsn",
(uint32) (requesting_node_last_lsn >> 32),
(uint32) requesting_node_last_lsn);
ret = SPI_execute(query.data, false, 0);
lsn_diff = DatumGetInt32(SPI_getbinval(SPI_tuptable->vals[0],
SPI_tuptable->tupdesc,
1, &isnull));
elog(INFO, "XXX diff is %i",
lsn_diff);
SPI_finish();
PG_RETURN_INT32(lsn_diff);
}

9
repmgrd.c
View File

@@ -483,8 +483,8 @@ monitor_streaming_standby(void)
// check result
(void) get_node_record(local_conn, local_node_info.upstream_node_id, &upstream_node_info);
// check result, fail if not up (must start on running node)
upstream_conn = establish_db_connection(config_file_options.conninfo, false);
// handle failure - do we want to loop here?
upstream_conn = establish_db_connection(upstream_node_info.conninfo, false);
// fix for cascaded standbys
primary_conn = upstream_conn;
@@ -635,8 +635,13 @@ do_election(void)
local_node_info.node_id,
local_node_info.priority,
last_wal_receive_lsn);
PQfinish(cell->node_info->conn);
cell->node_info->conn = NULL;
}
log_notice(_("%i of of %i votes"), votes_for_me, visible_nodes);
return VS_VOTE_WON;
}