pg_upgrade: preserve the timestamp epoch

bmomjian · bmomjian · commit 022aea346def · 2014-09-11T18:39:51.000-04:00
This is useful for replication tools like Slony and Skytools. This is a backpatch of a74a4aa. Report by Sergey Konoplev Backpatch through 9.3
diff --git a/contrib/pg_upgrade/controldata.c b/contrib/pg_upgrade/controldata.c
@@ -233,16 +233,20 @@ get_control_data(ClusterInfo *cluster, bool live_check)
 		}
 		else if ((p = strstr(bufin, "Latest checkpoint's NextXID:")) != NULL)
 		{
-			char	   *op = strchr(p, '/');
+			p = strchr(p, ':');
+
+			if (p == NULL || strlen(p) <= 1)
+				pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 
-			if (op == NULL)
-				op = strchr(p, ':');
+			p++;				/* removing ':' char */
+			cluster->controldata.chkpnt_nxtepoch = str2uint(p);
 
-			if (op == NULL || strlen(op) <= 1)
+			p = strchr(p, '/');
+			if (p == NULL || strlen(p) <= 1)
 				pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 
-			op++;				/* removing ':' char */
-			cluster->controldata.chkpnt_nxtxid = str2uint(op);
+			p++;				/* removing '/' char */
+			cluster->controldata.chkpnt_nxtxid = str2uint(p);
 			got_xid = true;
 		}
 		else if ((p = strstr(bufin, "Latest checkpoint's NextOID:")) != NULL)
diff --git a/contrib/pg_upgrade/pg_upgrade.c b/contrib/pg_upgrade/pg_upgrade.c
@@ -422,12 +422,16 @@ copy_clog_xlog_xid(void)
 	/* copy old commit logs to new data dir */
 	copy_subdir_files("pg_clog");
 
-	/* set the next transaction id of the new cluster */
-	prep_status("Setting next transaction ID for new cluster");
+	/* set the next transaction id and epoch of the new cluster */
+	prep_status("Setting next transaction ID and epoch for new cluster");
 	exec_prog(UTILITY_LOG_FILE, NULL, true,
 			  "\"%s/pg_resetxlog\" -f -x %u \"%s\"",
 			  new_cluster.bindir, old_cluster.controldata.chkpnt_nxtxid,
 			  new_cluster.pgdata);
+	exec_prog(UTILITY_LOG_FILE, NULL, true,
+			  "\"%s/pg_resetxlog\" -f -e %u \"%s\"",
+			  new_cluster.bindir, old_cluster.controldata.chkpnt_nxtepoch,
+			  new_cluster.pgdata);
 	check_ok();
 
 	/*
diff --git a/contrib/pg_upgrade/pg_upgrade.h b/contrib/pg_upgrade/pg_upgrade.h
@@ -190,6 +190,7 @@ typedef struct
 	char		nextxlogfile[25];
 	uint32		chkpnt_tli;
 	uint32		chkpnt_nxtxid;
+	uint32		chkpnt_nxtepoch;
 	uint32		chkpnt_nxtoid;
 	uint32		chkpnt_nxtmulti;
 	uint32		chkpnt_nxtmxoff;
