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Adds a method to determine if current node is primary #7720

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Adds a method to determine if current node is primary #7720

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21 changes: 21 additions & 0 deletions src/backend/distributed/metadata/node_metadata.c
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Original file line number Diff line number Diff line change
Expand Up @@ -167,6 +167,7 @@ PG_FUNCTION_INFO_V1(citus_nodeport_for_nodeid);
PG_FUNCTION_INFO_V1(citus_coordinator_nodeid);
PG_FUNCTION_INFO_V1(citus_is_coordinator);
PG_FUNCTION_INFO_V1(citus_internal_mark_node_not_synced);
PG_FUNCTION_INFO_V1(citus_is_primary_node);

/*
* DefaultNodeMetadata creates a NodeMetadata struct with the fields set to
Expand Down Expand Up @@ -1664,6 +1665,26 @@ citus_is_coordinator(PG_FUNCTION_ARGS)
PG_RETURN_BOOL(isCoordinator);
}

/*
* citus_is_primary_node returns whether the current node is a primary for
* a given group_id. We consider the node a primary if it has
* pg_dist_node entries marked as primary
*/
Datum
citus_is_primary_node(PG_FUNCTION_ARGS)
{
CheckCitusVersion(ERROR);

bool isPrimary = false;
int32 groupId = GetLocalGroupId();
WorkerNode *workerNode = PrimaryNodeForGroup(groupId, NULL);
if (workerNode != NULL && workerNode->nodeId == GetLocalNodeId())
{
isPrimary = true;
}

PG_RETURN_BOOL(isPrimary);
}

/*
* EnsureParentSessionHasExclusiveLockOnPgDistNode ensures given session id
Expand Down
7 changes: 7 additions & 0 deletions src/backend/distributed/sql/udfs/citus_is_primary_node/latest.sql
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@@ -0,0 +1,7 @@
CREATE FUNCTION pg_catalog.citus_is_primary_node()
RETURNS bool
LANGUAGE c
STRICT
AS 'MODULE_PATHNAME', $$citus_is_primary_node$$;
COMMENT ON FUNCTION pg_catalog.citus_is_primary_node()
IS 'returns whether the current node is the primary node in the group';