diff --git a/src/backend/access/transam/parallel.c b/src/backend/access/transam/parallel.c
index cbfe6087da..798cd86c88 100644
--- a/src/backend/access/transam/parallel.c
+++ b/src/backend/access/transam/parallel.c
@@ -1131,16 +1131,6 @@ HandleParallelMessage(ParallelContext *pcxt, int i, StringInfo msg)
 
 	switch (msgtype)
 	{
-		case PqMsg_BackendKeyData:
-			{
-				int32		pid = pq_getmsgint(msg, 4);
-
-				(void) pq_getmsgint(msg, 4);	/* discard cancel key */
-				(void) pq_getmsgend(msg);
-				pcxt->worker[i].pid = pid;
-				break;
-			}
-
 		case PqMsg_ErrorResponse:
 		case PqMsg_NoticeResponse:
 			{
@@ -1304,7 +1294,6 @@ ParallelWorkerMain(Datum main_arg)
 	char	   *relmapperspace;
 	char	   *uncommittedenumsspace;
 	char	   *clientconninfospace;
-	StringInfoData msgbuf;
 	char	   *session_dsm_handle_space;
 	Snapshot	tsnapshot;
 	Snapshot	asnapshot;
@@ -1369,18 +1358,6 @@ ParallelWorkerMain(Datum main_arg)
 	pq_set_parallel_leader(fps->parallel_leader_pid,
 						   fps->parallel_leader_proc_number);
 
-	/*
-	 * Send a BackendKeyData message to the process that initiated parallelism
-	 * so that it has access to our PID before it receives any other messages
-	 * from us.  Our cancel key is sent, too, since that's the way the
-	 * protocol message is defined, but it won't actually be used for anything
-	 * in this case.
-	 */
-	pq_beginmessage(&msgbuf, PqMsg_BackendKeyData);
-	pq_sendint32(&msgbuf, (int32) MyProcPid);
-	pq_sendint32(&msgbuf, (int32) MyCancelKey);
-	pq_endmessage(&msgbuf);
-
 	/*
 	 * Hooray! Primary initialization is complete.  Now, we need to set up our
 	 * backend-local state to match the original backend.
diff --git a/src/include/access/parallel.h b/src/include/access/parallel.h
index 64c6fb939e..69ffe5498f 100644
--- a/src/include/access/parallel.h
+++ b/src/include/access/parallel.h
@@ -26,7 +26,6 @@ typedef struct ParallelWorkerInfo
 {
 	BackgroundWorkerHandle *bgwhandle;
 	shm_mq_handle *error_mqh;
-	int32		pid;
 } ParallelWorkerInfo;
 
 typedef struct ParallelContext