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Fixes to function request_vote()

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This commit is contained in:
Ian Barwick
2017-07-17 12:04:56 +09:00
parent ec554e5694
commit 437cb26b7e
1 changed files with 15 additions and 6 deletions
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21
repmgr.c
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@@ -191,8 +191,6 @@ request_vote(PG_FUNCTION_ARGS)
LWLockAcquire(shared_state->lock, LW_SHARED);
/* this node has initiated voting or already responded to another node */
// if (current_electoral_term == shared_state->current_electoral_term
// && shared_state->voting_status != VS_NO_VOTE)
if (shared_state->voting_status != VS_NO_VOTE)
{
LWLockRelease(shared_state->lock);
@@ -200,7 +198,6 @@ request_vote(PG_FUNCTION_ARGS)
PG_RETURN_NULL();
}
elog(INFO, "requesting node id is %i for electoral term %i (our term: %i)",
requesting_node_id, current_electoral_term,
shared_state->current_electoral_term);
@@ -208,14 +205,27 @@ request_vote(PG_FUNCTION_ARGS)
SPI_connect();
initStringInfo(&query);
#if (PG_VERSION_NUM >= 100000)
appendStringInfo(
&query,
"SELECT pg_catalog.pg_last_wal_receive_lsn()");
#else
appendStringInfo(
&query,
"SELECT pg_catalog.pg_last_xlog_receive_location()");
#endif
elog(INFO, "query: %s", query.data);
ret = SPI_execute(query.data, true, 0);
// XXX handle errors
if (ret < 0)
{
SPI_finish();
elog(WARNING, "unable to retrieve last received LSN");
PG_RETURN_LSN(InvalidOid);
}
our_lsn = DatumGetLSN(SPI_getbinval(SPI_tuptable->vals[0],
SPI_tuptable->tupdesc,
1, &isnull));
@@ -225,8 +235,6 @@ request_vote(PG_FUNCTION_ARGS)
(uint32) (our_lsn >> 32),
(uint32) our_lsn);
SPI_finish();
/* indicate this node has responded to a vote request */
shared_state->voting_status = VS_VOTE_REQUEST_RECEIVED;
shared_state->current_electoral_term = current_electoral_term;
@@ -234,6 +242,7 @@ request_vote(PG_FUNCTION_ARGS)
LWLockRelease(shared_state->lock);
// should we free "query" here?
SPI_finish();
PG_RETURN_LSN(our_lsn);
#else