Provide fallback for unexpected reply in collective show

confluent_server/bin/collective

@@ -68,7 +68,7 @@ def join_collective(server, invitation):
     res = tlvdata.recv(s)
     res = res.get('collective',
                   {'status': 'Unknown response: ' + repr(res)})
-    print(res.get('status', res['error']))
+    print(res.get('status', res.get('error', repr(res))))
 
 
 def show_collective():

confluent_server/confluent/config/configmanager.py

@@ -63,6 +63,7 @@ import eventlet
 import eventlet.event as event
 import eventlet.green.select as select
 import eventlet.green.threading as gthread
+import eventlet.greenpool as gpool
 import fnmatch
 import json
 import operator
@@ -947,7 +948,7 @@ class ConfigManager(object):
             os.getenv('SystemDrive'), '\\ProgramData', 'confluent', 'cfg')
     else:
         _cfgdir = "/etc/confluent/cfg"
-    _cfgwriter = None
+    _cfgwriter = gpool.GreenPool(1)
     _writepending = False
     _syncrunning = False
     _syncstate = threading.RLock()
@@ -2045,11 +2046,9 @@ class ConfigManager(object):
 
     @classmethod
     def wait_for_sync(cls, fullsync=False):
-        if cls._cfgwriter is not None:
-            cls._cfgwriter.join()
+        cls._cfgwriter.waitall()
         cls._bg_sync_to_file(fullsync)
-        if cls._cfgwriter is not None:
-            cls._cfgwriter.join()
+        cls._cfgwriter.waitall()
 
     @classmethod
     def shutdown(cls):
@@ -2065,11 +2064,13 @@ class ConfigManager(object):
                 cls._writepending = True
                 return
             cls._syncrunning = True
-        # if the thread is exiting, join it to let it close, just in case
-        if cls._cfgwriter is not None:
-            cls._cfgwriter.join()
-        cls._cfgwriter = threading.Thread(target=cls._sync_to_file, args=(fullsync,))
-        cls._cfgwriter.start()
+        cls._cfgwriter.spawn_n(cls._g_sync_to_file, fullsync)
+
+    @classmethod
+    def _g_sync_to_file(cls, fullsync):
+        cls._sync_to_file(fullsync)
+
+
 
     @classmethod
     def _sync_to_file(cls, fullsync=False):