Ensure unique ports for multi-process tests

tests/TestRunner/local_cluster.py

@@ -7,12 +7,24 @@
 import socket
 
 
-def get_free_port():
+def _get_free_port_internal():
     with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
         s.bind(('0.0.0.0', 0))
         return s.getsockname()[1]
 
 
+_used_ports = set()
+
+
+def get_free_port():
+    global _used_ports
+    port = _get_free_port_internal()
+    while port in _used_ports:
+        port = _get_free_port_internal()
+    _used_ports.add(port)
+    return port
+
+
 class LocalCluster:
     configuration_template = """
 ## foundationdb.conf

tests/TestRunner/tmp_cluster.py

@@ -129,6 +129,10 @@ def close(self):
             break
 
         if errcode:
+            for etc_file in glob.glob(os.path.join(cluster.etc, "*")):
+                print(">>>>>>>>>>>>>>>>>>>> Contents of {}:".format(etc_file))
+                with open(etc_file, "r") as f:
+                    print(f.read())
             for log_file in glob.glob(os.path.join(cluster.log, "*")):
                 print(">>>>>>>>>>>>>>>>>>>> Contents of {}:".format(log_file))
                 with open(log_file, "r") as f: