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repmgrd: catch cases where more than one node has initiated voting

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The node(s) with higher ID will "yield", leaving the decision making
up to the node with the lower ID.

This happens very rarely, usually when the random delay is close
enough on two or mode nodes that vote initiation is simultaneous.
This commit is contained in:
Ian Barwick
2017-07-18 17:04:24 +09:00
parent 248525ccba
commit 6e270b2faf
4 changed files with 93 additions and 29 deletions
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8
dbutils.h
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@@ -52,6 +52,12 @@ typedef enum {
NODE_STATUS_DOWN
} NodeStatus;
typedef enum {
VR_VOTE_REFUSED = -1,
VR_POSITIVE_VOTE,
VR_NEGATIVE_VOTE
} VoteRequestResult;
/*
* Struct to store node information
*/
@@ -310,7 +316,7 @@ bool is_server_available(const char *conninfo);
/* node voting functions */
NodeVotingStatus get_voting_status(PGconn *conn);
int request_vote(PGconn *conn, t_node_info *this_node, t_node_info *other_node, int electoral_term);
VoteRequestResult request_vote(PGconn *conn, t_node_info *this_node, t_node_info *other_node, int electoral_term);
int set_voting_status_initiated(PGconn *conn);
bool announce_candidature(PGconn *conn, t_node_info *this_node, t_node_info *other_node, int electoral_term);
void notify_follow_primary(PGconn *conn, int primary_node_id);