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Basic voting

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This commit is contained in:
Ian Barwick
2017-06-29 01:11:21 +09:00
parent d6b6255144
commit fa86fe4ad8
6 changed files with 121 additions and 20 deletions
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75
repmgrd.c
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@@ -6,7 +6,9 @@
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <time.h>
#include "repmgr.h"
#include "config.h"
@@ -103,6 +105,8 @@ main(int argc, char **argv)
set_progname(argv[0]);
srand ( time(NULL) );
/* Disallow running as root */
if (geteuid() == 0)
{
@@ -530,7 +534,32 @@ monitor_streaming_standby(void)
/* still down after reconnect attempt(s) - */
if (upstream_node_status == NODE_STATUS_DOWN)
{
do_election();
NodeVotingStatus voting_status = do_election();
switch(voting_status)
{
case VS_NO_VOTE:
log_info("NO VOTE");
break;
case VS_VOTE_REQUEST_RECEIVED:
log_info("VOTE REQUEST RECEIVED");
break;
case VS_VOTE_INITIATED:
log_info("VOTE REQUEST INITIATED");
break;
case VS_VOTE_WON:
log_info("VOTE REQUEST WON");
break;
case VS_VOTE_LOST:
log_info("VOTE REQUEST LOST");
break;
case VS_UNKNOWN:
log_info("VOTE REQUEST UNKNOWN");
break;
}
// begin voting process
// if VS_PROMOTION_CANDIDATE
@@ -551,9 +580,8 @@ monitor_streaming_standby(void)
static NodeVotingStatus
do_election(void)
{
int total_eligible_nodes = 0;
/* current node votes for itself by default */
int votes_for_me = 1;
// int total_eligible_nodes = 0;
int votes_for_me = 0;
/* we're visible */
int visible_nodes = 1;
@@ -568,15 +596,27 @@ do_election(void)
NodeInfoList standby_nodes = T_NODE_INFO_LIST_INITIALIZER;
NodeInfoListCell *cell;
long unsigned rand_wait = (long) ((rand() % 50) + 10) * 10000;
log_debug("do_election(): sleeping %li", rand_wait);
pg_usleep(rand_wait);
voting_status = get_voting_status(local_conn);
log_debug("do_election(): node voting status is %i", (int)voting_status);
if (voting_status == VS_VOTE_REQUEST_RECEIVED)
{
log_debug("vote request already received, not candidate");
/* we've already been requested to vote, so can't become a candidate */
return voting_status;
}
// XXX should we mark ourselves as candidate?
// -> so any further vote requests are rejected?
set_voting_status_initiated(local_conn);
/* get all active nodes attached to primary, excluding self */
// XXX include barman node in results
@@ -612,15 +652,25 @@ do_election(void)
// XXX check if > 50% visible
/* check if we've been asked to vote again */
// XXX do that
/* check again if we've been asked to vote */
// XXX should we mark ourselves as candidate?
// -> so any further vote requests are rejected?
if (0)
{
voting_status = get_voting_status(local_conn);
log_debug("do_election(): node voting status is %i", (int)voting_status);
if (voting_status == VS_VOTE_REQUEST_RECEIVED)
{
/* we've already been requested to vote, so can't become a candidate */
return voting_status;
}
}
/* current node votes for itself by default */
votes_for_me += 1;
/* get our lsn*/
last_wal_receive_lsn = get_last_wal_receive_location(local_conn);
log_debug("LAST receive lsn = %X/%X", (uint32) (last_wal_receive_lsn >> 32), (uint32) last_wal_receive_lsn);
@@ -643,7 +693,10 @@ do_election(void)
log_notice(_("%i of of %i votes"), votes_for_me, visible_nodes);
return VS_VOTE_WON;
if (votes_for_me == visible_nodes)
return VS_VOTE_WON;
return VS_VOTE_LOST;
}
static void
@@ -846,7 +899,7 @@ try_reconnect(const char *conninfo, NodeStatus *node_status)
int i;
// XXX make this all configurable
int max_attempts = 15;
int max_attempts = 10;
for (i = 0; i < max_attempts; i++)
{