In backup mode, fix update of outdated partition when there's more than 1 replica

neo/master/backup_app.py

@@ -145,7 +145,7 @@ class BackupApplication(object):
                 #      they would be quickly updated at the beginning of the
                 #      RUNNING phase. This may simplify code.
                 # Any unfinished replication from upstream will be truncated.
-                while pt.getCheckTid(xrange(pt.getPartitions())) < tid:
+                while pt.getBackupTid(min) < tid:
                     poll(1)
                 last_tid = app.getLastTransaction()
                 handler = EventHandler(app)

neo/master/handlers/storage.py

@@ -50,7 +50,7 @@ class StorageServiceHandler(BaseServiceHandler):
     def askUnfinishedTransactions(self, conn):
         app = self.app
         if app.backup_tid:
-            last_tid = app.pt.getBackupTid()
+            last_tid = app.pt.getBackupTid(min)
             pending_list = ()
         else:
             last_tid = app.tm.getLastTID()

neo/master/pt.py

@@ -325,9 +325,9 @@ class PartitionTable(neo.lib.pt.PartitionTable):
                     cell.backup_tid = backup_tid_dict.get(cell.getUUID(),
                                                           ZERO_TID)
 
-    def getBackupTid(self):
+    def getBackupTid(self, mean=max):
         try:
-            return min(max(cell.backup_tid for cell in row if cell.isReadable())
+            return min(mean(x.backup_tid for x in row if x.isReadable())
                        for row in self.partition_list)
         except ValueError:
             return ZERO_TID