From f40f03270a10126f7742e481fe5ae18343c4c8e6 Mon Sep 17 00:00:00 2001
From: Brian Cloutier <github@briancloutier.com>
Date: Tue, 4 Jul 2017 14:26:01 +0300
Subject: [PATCH] Fix locking in ReadWorkerNodes()

---
 src/backend/distributed/utils/node_metadata.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/backend/distributed/utils/node_metadata.c b/src/backend/distributed/utils/node_metadata.c
index a2b29c847..e72dd99e9 100644
--- a/src/backend/distributed/utils/node_metadata.c
+++ b/src/backend/distributed/utils/node_metadata.c
@@ -470,7 +470,7 @@ ReadWorkerNodes()
 	List *workerNodeList = NIL;
 	TupleDesc tupleDescriptor = NULL;
 
-	Relation pgDistNode = heap_open(DistNodeRelationId(), AccessExclusiveLock);
+	Relation pgDistNode = heap_open(DistNodeRelationId(), AccessShareLock);
 
 	scanDescriptor = systable_beginscan(pgDistNode,
 										InvalidOid, false,
@@ -488,7 +488,7 @@ ReadWorkerNodes()
 	}
 
 	systable_endscan(scanDescriptor);
-	heap_close(pgDistNode, AccessExclusiveLock);
+	heap_close(pgDistNode, NoLock);
 
 	return workerNodeList;
 }