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Re-use replication slot if it already exists

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Per issue #65 in GitHub
This commit is contained in:
Ian Barwick
2015-04-13 13:17:38 +09:00
parent 6a17360b4c
commit e8025c7c9f
1 changed files with 43 additions and 0 deletions
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43
dbutils.c
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@@ -728,6 +728,49 @@ create_replication_slot(PGconn *conn, char *slot_name)
char sqlquery[QUERY_STR_LEN];
PGresult *res;
/*
* Check whether slot exists already; if it exists and is active, that
* means another active standby is using it, which creates an error situation;
* if not we can reuse it as-is
*/
sqlquery_snprintf(sqlquery,
"SELECT active, slot_type "
" FROM pg_replication_slots "
" WHERE slot_name = '%s' ",
slot_name);
res = PQexec(conn, sqlquery);
if (!res || PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_err(_("unable to query pg_replication_slots: %s\n"),
PQerrorMessage(conn));
PQclear(res);
return false;
}
if(PQntuples(res))
{
if(strcmp(PQgetvalue(res, 0, 1), "physical") != 0)
{
log_err(_("Slot '%s' exists and is not a physical slot\n"),
slot_name);
PQclear(res);
}
if(strcmp(PQgetvalue(res, 0, 0), "f") == 0)
{
PQclear(res);
log_debug(_("Replication slot '%s' exists but is inactive; reusing\n"),
slot_name);
return true;
}
PQclear(res);
log_err(_("Slot '%s' already exists as an active slot\n"),
slot_name);
return false;
}
sqlquery_snprintf(sqlquery,
"SELECT * FROM pg_create_physical_replication_slot('%s')",
slot_name);