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repmgrd: add additional logging during a failover operation

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This commit is contained in:
Ian Barwick
2019-02-27 11:45:34 +09:00
parent 98b78df16c
commit 0cd2bd2e91
1 changed files with 66 additions and 36 deletions
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102
repmgrd-physical.c
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@@ -3141,9 +3141,19 @@ do_election(void)
total_nodes = sibling_nodes.node_count + 1;
log_debug("do_election(): primary location is \"%s\", standby location is \"%s\"",
upstream_node_info.location,
local_node_info.location);
if (strncmp(upstream_node_info.location, local_node_info.location, MAXLEN) != 0)
{
log_info(_("primary node \"%s\" (ID: %i) has location \"%s\", this node's location is \"%s\""),
upstream_node_info.node_name,
upstream_node_info.node_id,
upstream_node_info.location,
local_node_info.location);
}
else
{
log_info(_("primary and this node have the same location (\"%s\")"),
local_node_info.location);
}
local_node_info.last_wal_receive_lsn = InvalidXLogRecPtr;
@@ -3152,7 +3162,7 @@ do_election(void)
{
if (strncmp(upstream_node_info.location, local_node_info.location, MAXLEN) == 0)
{
log_debug("no other nodes - we win by default");
log_info(_("no other sibling nodes - we win by default"));
return ELECTION_WON;
}
else
@@ -3215,8 +3225,7 @@ do_election(void)
local_node_info.last_wal_receive_lsn = local_replication_info.last_wal_receive_lsn;
log_debug("our last receive lsn: %X/%X", format_lsn(local_node_info.last_wal_receive_lsn));
log_info(_("local node's last receive lsn: %X/%X"), format_lsn(local_node_info.last_wal_receive_lsn));
/* pointer to "winning" node, initially self */
candidate_node = &local_node_info;
@@ -3259,10 +3268,11 @@ do_election(void)
}
/* don't check 0-priority nodes */
if (cell->node_info->priority == 0)
if (cell->node_info->priority <= 0)
{
log_debug("node %i has priority of 0, skipping",
cell->node_info->node_id);
log_info(_("node %i has priority of %i, skipping"),
cell->node_info->node_id,
cell->node_info->priority);
continue;
}
@@ -3277,14 +3287,16 @@ do_election(void)
*/
if (repmgrd_get_pid(cell->node_info->conn) == UNKNOWN_PID)
{
log_warning(_("repmgrd not running on node %i, skipping"),
log_warning(_("repmgrd not running on node \"%s\" (ID: %i), skipping"),
cell->node_info->node_name,
cell->node_info->node_id);
continue;
}
if (get_replication_info(cell->node_info->conn, &sibling_replication_info) == false)
{
log_warning(_("unable to retrieve replication information for node %i, skipping"),
log_warning(_("unable to retrieve replication information for node \"%s\" (ID: %i), skipping"),
cell->node_info->node_name,
cell->node_info->node_id);
continue;
}
@@ -3298,60 +3310,75 @@ do_election(void)
*/
if (sibling_replication_info.last_wal_receive_lsn > sibling_replication_info.last_wal_replay_lsn)
{
log_warning(_("WAL replay on node %i is paused and WAL is pending replay"),
cell->node_info->node_id);
log_warning(_("WAL replay on node \"%s\" (ID: %i) is paused and WAL is pending replay"),
cell->node_info->node_name,
cell->node_info->node_id);
}
}
/* get node's last receive LSN - if "higher" than current winner, current node is candidate */
cell->node_info->last_wal_receive_lsn = sibling_replication_info.last_wal_receive_lsn;
log_verbose(LOG_DEBUG, "node %i's last receive LSN is: %X/%X",
cell->node_info->node_id,
format_lsn(cell->node_info->last_wal_receive_lsn));
log_info(_("last receive LSN for sibling node \"%s\" (ID: %i) is: %X/%X"),
cell->node_info->node_name,
cell->node_info->node_id,
format_lsn(cell->node_info->last_wal_receive_lsn));
/* compare LSN */
if (cell->node_info->last_wal_receive_lsn > candidate_node->last_wal_receive_lsn)
{
/* other node is ahead */
log_verbose(LOG_DEBUG, "node %i is ahead of current candidate %i",
cell->node_info->node_id,
candidate_node->node_id);
log_info(_("node \"%s\" (ID: %i) is ahead of current candidate \"%s\" (ID: %i)"),
cell->node_info->node_name,
cell->node_info->node_id,
candidate_node->node_name,
candidate_node->node_id);
candidate_node = cell->node_info;
}
/* LSN is same - tiebreak on priority, then node_id */
else if (cell->node_info->last_wal_receive_lsn == candidate_node->last_wal_receive_lsn)
{
log_verbose(LOG_DEBUG, "node %i has same LSN as current candidate %i",
cell->node_info->node_id,
candidate_node->node_id);
log_info(_("node \"%s\" (ID: %i) has same LSN as current candidate \"%s\" (ID: %i)"),
cell->node_info->node_name,
cell->node_info->node_id,
candidate_node->node_name,
candidate_node->node_id);
if (cell->node_info->priority > candidate_node->priority)
{
log_verbose(LOG_DEBUG, "node %i has higher priority (%i) than current candidate %i (%i)",
cell->node_info->node_id,
cell->node_info->priority,
candidate_node->node_id,
candidate_node->priority);
log_info(_("node \"%s\" (ID: %i) has higher priority (%i) than current candidate \"%s\" (ID: %i) (%i)"),
cell->node_info->node_name,
cell->node_info->node_id,
cell->node_info->priority,
candidate_node->node_name,
candidate_node->node_id,
candidate_node->priority);
candidate_node = cell->node_info;
}
else if (cell->node_info->priority == candidate_node->priority)
{
if (cell->node_info->node_id < candidate_node->node_id)
{
log_verbose(LOG_DEBUG, "node %i has same priority but lower node_id than current candidate %i",
cell->node_info->node_id,
candidate_node->node_id);
log_info(_("node \"%s\" (ID: %i) has same priority but lower node_id than current candidate \"%s\" (ID: %i)"),
cell->node_info->node_name,
cell->node_info->node_id,
candidate_node->node_name,
candidate_node->node_id);
candidate_node = cell->node_info;
}
}
else
{
log_verbose(LOG_DEBUG, "node %i has lower priority (%i) than current candidate %i (%i)",
cell->node_info->node_id,
cell->node_info->priority,
candidate_node->node_id,
candidate_node->priority);
log_info(_("node \"%s\" (ID: %i) has lower priority (%i) than current candidate \"%s\" (ID: %i) (%i)"),
cell->node_info->node_name,
cell->node_info->node_id,
cell->node_info->priority,
candidate_node->node_name,
candidate_node->node_id,
candidate_node->priority);
}
}
}
@@ -3387,7 +3414,10 @@ do_election(void)
return ELECTION_CANCELLED;
}
log_debug("promotion candidate is %i", candidate_node->node_id);
log_notice(_("promotion candidate is \"%s\" (ID: %i)"),
candidate_node->node_name,
candidate_node->node_id);
if (candidate_node->node_id == local_node_info.node_id)
return ELECTION_WON;