Use repeatable read isolation level

Author: knizhnik

contrib/mmts/tests2/docker-entrypoint.sh

@@ -73,6 +73,7 @@ if [ "$1" = 'postgres' ]; then
 			max_replication_slots = 10
 			max_wal_senders = 10
 			shared_preload_libraries = 'raftable,multimaster'
+            default_transaction_isolation = 'repeatable read'
 
 			raftable.id = $NODE_ID
 			raftable.peers = '$RAFT_PEERS'

contrib/mmts/tests2/lib/event_history.py

@@ -1,3 +1,4 @@
+from __future__ import print_function
 import time
 import datetime
 import uuid
@@ -96,7 +97,7 @@ def aggregate(self):
             if named_agg['running_latency'] < latency:
                 named_agg['running_latency'] = latency
 
-        self.last_aggregation = datetime.datetime.now()
+        #self.last_aggregation = last_aggregation 
         #print("aggregeted!")
         return agg