do not hold lock for mtm.cluster_nodes in MtmOnNodeConnect

Author: kelvich

src/dmq.c

@@ -1000,6 +1000,7 @@ dmq_receiver_loop(PG_FUNCTION_ARGS)
 
 	/* setup queues with backends */
 	seg = dsm_create(dmq_toc_size(), 0);
+	dsm_pin_mapping(seg);
 	toc = shm_toc_create(DMQ_MQ_MAGIC, dsm_segment_address(seg),
 						 dmq_toc_size());
 	mq_handles = palloc(MaxBackends*sizeof(shm_mq_handle *));

src/state.c

@@ -500,6 +500,11 @@ void MtmOnNodeConnect(char *node_name)
 	else
 		mtm_log(MtmStateMessage, "[STATE] Node %i: connected", node_id);
 
+	/* do not hold lock for mtm.cluster_nodes */
+	ResourceOwnerRelease(TopTransactionResourceOwner,
+						RESOURCE_RELEASE_LOCKS,
+						true, true);
+
 	LWLockAcquire(MtmStateLock, LW_EXCLUSIVE);
 
 	BIT_SET(mtm_state->connected_mask, node_id - 1);