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repmgrd: in BDR mode, have each repmgrd monitor each node

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This will cover both the case when an entire node including
repmgrd goes down, and when one PostgreSQL instance goes down
but repmgrd is still up (in which case only one of the repmgrds
will handle the failover).
This commit is contained in:
Ian Barwick
2017-07-14 15:01:18 +09:00
parent e3b3fb65f0
commit 951c7dbd07
9 changed files with 211 additions and 89 deletions
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46
repmgr.c
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@@ -45,11 +45,14 @@ typedef enum {
typedef struct repmgrdSharedState
{
LWLockId lock; /* protects search/modification */
/* streaming failover */
NodeState node_state;
NodeVotingStatus voting_status;
int current_electoral_term;
int candidate_node_id;
bool follow_new_primary;
/* BDR failover */
int bdr_failover_handler;
} repmgrdSharedState;
static repmgrdSharedState *shared_state = NULL;
@@ -83,6 +86,13 @@ PG_FUNCTION_INFO_V1(get_new_primary);
Datum reset_voting_status(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(reset_voting_status);
Datum am_bdr_failover_handler(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(am_bdr_failover_handler);
Datum unset_bdr_failover_handler(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(unset_bdr_failover_handler);
/*
* Module load callback
*/
@@ -157,6 +167,7 @@ repmgr_shmem_startup(void)
shared_state->voting_status = VS_NO_VOTE;
shared_state->candidate_node_id = UNKNOWN_NODE_ID;
shared_state->follow_new_primary = false;
shared_state->bdr_failover_handler = UNKNOWN_NODE_ID;
}
LWLockRelease(AddinShmemInitLock);
@@ -330,3 +341,38 @@ reset_voting_status(PG_FUNCTION_ARGS)
PG_RETURN_VOID();
}
Datum
am_bdr_failover_handler(PG_FUNCTION_ARGS)
{
int node_id = PG_GETARG_INT32(0);
bool am_handler = false;
LWLockAcquire(shared_state->lock, LW_SHARED);
if (shared_state->bdr_failover_handler == UNKNOWN_NODE_ID)
{
shared_state->bdr_failover_handler = node_id;
am_handler = true;
}
else if (shared_state->bdr_failover_handler == node_id)
{
am_handler = true;
}
LWLockRelease(shared_state->lock);
PG_RETURN_BOOL(am_handler);
}
Datum
unset_bdr_failover_handler(PG_FUNCTION_ARGS)
{
LWLockAcquire(shared_state->lock, LW_SHARED);
shared_state->bdr_failover_handler = UNKNOWN_NODE_ID;
LWLockRelease(shared_state->lock);
PG_RETURN_VOID();
}