Postgres-XL adding GTM Proxy seems to do nothing

I've set up a Postgres-XL cluster using this recipe: GTM: hostname=host1 nodename=gtm Coordinator： hostname=host2 nodename=coord1 Datanode1： hostname=host3 nodename=datanode1 Datanode2： hostname=host4 nodename=datanode2 When I ran a load test against it, the GTM would fallover. I tweak settings until the GTM didn't fall over but only reported errors - thus kept on working after the load test. I the added a GTM Proxy. I did not do init all but rather only init the proxy. When I restarted the cluster, the GTM reported that the GTM proxy was up and running. When I looked at the GTM proxy's log, it looked like it started up and was connected. But when I ran the load test again, I got the same result with no log entries for the GTM proxy. Thus it seems like the GTM Proxy didn't pick up the load processing as I expected it to do. I don't know how to trouble shoot this. Any pointers on where to look next? (I don't know what extra info to post here)