diff --git a/mcrouter/test/MCProcess.py b/mcrouter/test/MCProcess.py
index cb8501cf..c9a2d909 100644
--- a/mcrouter/test/MCProcess.py
+++ b/mcrouter/test/MCProcess.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 import errno
 import os
diff --git a/mcrouter/test/McrouterTestCase.py b/mcrouter/test/McrouterTestCase.py
index 76a2d8f6..1d74179f 100644
--- a/mcrouter/test/McrouterTestCase.py
+++ b/mcrouter/test/McrouterTestCase.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import os
 import time
 import unittest
diff --git a/mcrouter/test/mock_servers.py b/mcrouter/test/mock_servers.py
index 90e19acc..10028cb9 100644
--- a/mcrouter/test/mock_servers.py
+++ b/mcrouter/test/mock_servers.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 import errno
 import socket
diff --git a/mcrouter/test/test_additional_fields.py b/mcrouter/test/test_additional_fields.py
index 222cc265..81621547 100644
--- a/mcrouter/test/test_additional_fields.py
+++ b/mcrouter/test/test_additional_fields.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.MCProcess import Memcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_allow_only_gets.py b/mcrouter/test/test_allow_only_gets.py
index e8cee702..83fed1d3 100644
--- a/mcrouter/test/test_allow_only_gets.py
+++ b/mcrouter/test/test_allow_only_gets.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import time
 
 from mcrouter.test.MCProcess import Memcached
diff --git a/mcrouter/test/test_ascii_error.py b/mcrouter/test/test_ascii_error.py
index a485c5ba..8bfb28ed 100644
--- a/mcrouter/test/test_ascii_error.py
+++ b/mcrouter/test/test_ascii_error.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import time
 
 from mcrouter.test.McrouterTestCase import McrouterTestCase
diff --git a/mcrouter/test/test_ascii_multiget_mock.py b/mcrouter/test/test_ascii_multiget_mock.py
index bdad6949..6713f65f 100644
--- a/mcrouter/test/test_ascii_multiget_mock.py
+++ b/mcrouter/test/test_ascii_multiget_mock.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.MCProcess import MockMemcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_async_files.py b/mcrouter/test/test_async_files.py
index 87ce1846..fcfc399b 100644
--- a/mcrouter/test/test_async_files.py
+++ b/mcrouter/test/test_async_files.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 import json
 import os
diff --git a/mcrouter/test/test_async_files_attr.py b/mcrouter/test/test_async_files_attr.py
index 962e9be2..208201c8 100644
--- a/mcrouter/test/test_async_files_attr.py
+++ b/mcrouter/test/test_async_files_attr.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 import importlib.resources
 import json
diff --git a/mcrouter/test/test_axonlog.py b/mcrouter/test/test_axonlog.py
index 5bd93026..feeaf5d0 100644
--- a/mcrouter/test/test_axonlog.py
+++ b/mcrouter/test/test_axonlog.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 from mcrouter.test.mock_servers import DeadServer
 
diff --git a/mcrouter/test/test_bad_params.py b/mcrouter/test/test_bad_params.py
index e6ce606c..d4ac6beb 100644
--- a/mcrouter/test/test_bad_params.py
+++ b/mcrouter/test/test_bad_params.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import re
 import signal
 import socket
diff --git a/mcrouter/test/test_bigvalue.py b/mcrouter/test/test_bigvalue.py
index 701913f5..b6e165bb 100644
--- a/mcrouter/test/test_bigvalue.py
+++ b/mcrouter/test/test_bigvalue.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.MCProcess import Memcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_bucketized_poolroute.py b/mcrouter/test/test_bucketized_poolroute.py
index 0b877779..85967c8a 100644
--- a/mcrouter/test/test_bucketized_poolroute.py
+++ b/mcrouter/test/test_bucketized_poolroute.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.MCProcess import Memcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_carbonlookaside_route.py b/mcrouter/test/test_carbonlookaside_route.py
index c4b0666f..aa1cb6ee 100644
--- a/mcrouter/test/test_carbonlookaside_route.py
+++ b/mcrouter/test/test_carbonlookaside_route.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import os
 import queue
 import tempfile
diff --git a/mcrouter/test/test_config_params.py b/mcrouter/test/test_config_params.py
index 9df81d9d..8f6599a2 100644
--- a/mcrouter/test/test_config_params.py
+++ b/mcrouter/test/test_config_params.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import tempfile
 import time
 
diff --git a/mcrouter/test/test_const_shard_hash.py b/mcrouter/test/test_const_shard_hash.py
index f51cf4b2..ad6f861e 100644
--- a/mcrouter/test/test_const_shard_hash.py
+++ b/mcrouter/test/test_const_shard_hash.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.MCProcess import Memcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_custom_failover.py b/mcrouter/test/test_custom_failover.py
index e24213bf..74174518 100644
--- a/mcrouter/test/test_custom_failover.py
+++ b/mcrouter/test/test_custom_failover.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 from mcrouter.test.MCProcess import Memcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
diff --git a/mcrouter/test/test_debug_fifos.py b/mcrouter/test/test_debug_fifos.py
index bc310ef6..4f57dcc1 100644
--- a/mcrouter/test/test_debug_fifos.py
+++ b/mcrouter/test/test_debug_fifos.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import os
 import time
 
diff --git a/mcrouter/test/test_deterministic_failover.py b/mcrouter/test/test_deterministic_failover.py
index e9e81669..9b0a6f55 100644
--- a/mcrouter/test/test_deterministic_failover.py
+++ b/mcrouter/test/test_deterministic_failover.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import time
 
 from mcrouter.test.MCProcess import Mcrouter
diff --git a/mcrouter/test/test_dump_config.py b/mcrouter/test/test_dump_config.py
index 9f0990ce..d5a5517c 100644
--- a/mcrouter/test/test_dump_config.py
+++ b/mcrouter/test/test_dump_config.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import os
 import shutil
 import time
diff --git a/mcrouter/test/test_empty_pool.py b/mcrouter/test/test_empty_pool.py
index 36dc3c4d..d04413a2 100644
--- a/mcrouter/test/test_empty_pool.py
+++ b/mcrouter/test/test_empty_pool.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
 
diff --git a/mcrouter/test/test_flush_all.py b/mcrouter/test/test_flush_all.py
index 58f80cfa..abc0412f 100644
--- a/mcrouter/test/test_flush_all.py
+++ b/mcrouter/test/test_flush_all.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import time
 
 from mcrouter.test.MCProcess import MockMemcached
diff --git a/mcrouter/test/test_largeobj.py b/mcrouter/test/test_largeobj.py
index d054237c..711e5258 100644
--- a/mcrouter/test/test_largeobj.py
+++ b/mcrouter/test/test_largeobj.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 from mcrouter.test.mock_servers import StoreServer
 
diff --git a/mcrouter/test/test_latency_injection_route.py b/mcrouter/test/test_latency_injection_route.py
index c7f59193..f1eeedd6 100644
--- a/mcrouter/test/test_latency_injection_route.py
+++ b/mcrouter/test/test_latency_injection_route.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from datetime import datetime
 
 from mcrouter.test.MCProcess import Memcached
diff --git a/mcrouter/test/test_lease_pairing.py b/mcrouter/test/test_lease_pairing.py
index 3ce2bc32..04807ffa 100644
--- a/mcrouter/test/test_lease_pairing.py
+++ b/mcrouter/test/test_lease_pairing.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 from mcrouter.test.MCProcess import McrouterClients, Memcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
diff --git a/mcrouter/test/test_linenumbers.py b/mcrouter/test/test_linenumbers.py
index 2156001e..a832920b 100644
--- a/mcrouter/test/test_linenumbers.py
+++ b/mcrouter/test/test_linenumbers.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import signal
 import subprocess
 import tempfile
diff --git a/mcrouter/test/test_loadbalancer_route.py b/mcrouter/test/test_loadbalancer_route.py
index cf2a0e59..3af0ca8f 100644
--- a/mcrouter/test/test_loadbalancer_route.py
+++ b/mcrouter/test/test_loadbalancer_route.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.MCProcess import Mcrouter, MockMemcachedDual
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_logging_route.py b/mcrouter/test/test_logging_route.py
index 97d1646d..abe43874 100644
--- a/mcrouter/test/test_logging_route.py
+++ b/mcrouter/test/test_logging_route.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.MCProcess import Memcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_logical_routing_policies.py b/mcrouter/test/test_logical_routing_policies.py
index 5e38d143..1255aee3 100644
--- a/mcrouter/test/test_logical_routing_policies.py
+++ b/mcrouter/test/test_logical_routing_policies.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.MCProcess import *
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_max_shadow_requests.py b/mcrouter/test/test_max_shadow_requests.py
index 0ee351c0..145737c5 100644
--- a/mcrouter/test/test_max_shadow_requests.py
+++ b/mcrouter/test/test_max_shadow_requests.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import time
 
 from mcrouter.test.MCProcess import Memcached
diff --git a/mcrouter/test/test_mcpiper.py b/mcrouter/test/test_mcpiper.py
index 04cae523..13522d23 100644
--- a/mcrouter/test/test_mcpiper.py
+++ b/mcrouter/test/test_mcpiper.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 import time
 
diff --git a/mcrouter/test/test_mcrefill.py b/mcrouter/test/test_mcrefill.py
index e9402744..ec6bb28e 100644
--- a/mcrouter/test/test_mcrefill.py
+++ b/mcrouter/test/test_mcrefill.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.MCProcess import Memcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_mcrouter.py b/mcrouter/test/test_mcrouter.py
index 3c24220c..d17d7ae0 100644
--- a/mcrouter/test/test_mcrouter.py
+++ b/mcrouter/test/test_mcrouter.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 import time
 
diff --git a/mcrouter/test/test_mcrouter_basic.py b/mcrouter/test/test_mcrouter_basic.py
index 16fde5f8..c92ae9b6 100644
--- a/mcrouter/test/test_mcrouter_basic.py
+++ b/mcrouter/test/test_mcrouter_basic.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 import time
 from threading import Thread
diff --git a/mcrouter/test/test_mcrouter_errors.py b/mcrouter/test/test_mcrouter_errors.py
index 7f6bdb5d..6a062ea2 100644
--- a/mcrouter/test/test_mcrouter_errors.py
+++ b/mcrouter/test/test_mcrouter_errors.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import errno
 import re
 import socket
diff --git a/mcrouter/test/test_mcrouter_processing_time.py b/mcrouter/test/test_mcrouter_processing_time.py
index e7d181a0..7e7a77be 100644
--- a/mcrouter/test/test_mcrouter_processing_time.py
+++ b/mcrouter/test/test_mcrouter_processing_time.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import json
 import os
 import tempfile
diff --git a/mcrouter/test/test_mcrouter_sanity_mock.py b/mcrouter/test/test_mcrouter_sanity_mock.py
index c0d81665..a6d73287 100644
--- a/mcrouter/test/test_mcrouter_sanity_mock.py
+++ b/mcrouter/test/test_mcrouter_sanity_mock.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 import random
 
diff --git a/mcrouter/test/test_mcrouter_serialized.py b/mcrouter/test/test_mcrouter_serialized.py
index c5904970..09f2aab7 100644
--- a/mcrouter/test/test_mcrouter_serialized.py
+++ b/mcrouter/test/test_mcrouter_serialized.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 import time
 
diff --git a/mcrouter/test/test_mcrouter_states.py b/mcrouter/test/test_mcrouter_states.py
index 437a38c1..544bcdcc 100644
--- a/mcrouter/test/test_mcrouter_states.py
+++ b/mcrouter/test/test_mcrouter_states.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import time
 
 from mcrouter.test.MCProcess import McrouterClient, Memcached
diff --git a/mcrouter/test/test_mcrouter_to_mcrouter_tko.py b/mcrouter/test/test_mcrouter_to_mcrouter_tko.py
index 07a0cf45..4511b805 100644
--- a/mcrouter/test/test_mcrouter_to_mcrouter_tko.py
+++ b/mcrouter/test/test_mcrouter_to_mcrouter_tko.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import re
 import time
 
diff --git a/mcrouter/test/test_memcache_router.py b/mcrouter/test/test_memcache_router.py
index 2b3e83f8..3e3274db 100644
--- a/mcrouter/test/test_memcache_router.py
+++ b/mcrouter/test/test_memcache_router.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.MCProcess import Memcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_migrated_failover.py b/mcrouter/test/test_migrated_failover.py
index 0e382eeb..342928de 100644
--- a/mcrouter/test/test_migrated_failover.py
+++ b/mcrouter/test/test_migrated_failover.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.MCProcess import Memcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_miss_on_error_arith_ops.py b/mcrouter/test/test_miss_on_error_arith_ops.py
index 86ea7918..528ad9d5 100644
--- a/mcrouter/test/test_miss_on_error_arith_ops.py
+++ b/mcrouter/test/test_miss_on_error_arith_ops.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 from mcrouter.test.mock_servers import CustomErrorServer
 
diff --git a/mcrouter/test/test_modify_exptime.py b/mcrouter/test/test_modify_exptime.py
index 0c5f6118..e16479b2 100644
--- a/mcrouter/test/test_modify_exptime.py
+++ b/mcrouter/test/test_modify_exptime.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import time
 
 from mcrouter.test.MCProcess import Memcached
diff --git a/mcrouter/test/test_modify_key.py b/mcrouter/test/test_modify_key.py
index 5e932bfd..76854a38 100644
--- a/mcrouter/test/test_modify_key.py
+++ b/mcrouter/test/test_modify_key.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import time
 
 from mcrouter.test.MCProcess import Memcached
diff --git a/mcrouter/test/test_named_handles.py b/mcrouter/test/test_named_handles.py
index a5b2d1bb..132b919d 100644
--- a/mcrouter/test/test_named_handles.py
+++ b/mcrouter/test/test_named_handles.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.MCProcess import Memcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_noreply.py b/mcrouter/test/test_noreply.py
index 91030c83..36c78ea2 100644
--- a/mcrouter/test/test_noreply.py
+++ b/mcrouter/test/test_noreply.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_operation_selector_route.py b/mcrouter/test/test_operation_selector_route.py
index 7e4b8879..f3cfc939 100644
--- a/mcrouter/test/test_operation_selector_route.py
+++ b/mcrouter/test/test_operation_selector_route.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.MCProcess import Memcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_poolstats.py b/mcrouter/test/test_poolstats.py
index 794d4163..6b089f6a 100644
--- a/mcrouter/test/test_poolstats.py
+++ b/mcrouter/test/test_poolstats.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import os
 
 import time
diff --git a/mcrouter/test/test_probe_timeout.py b/mcrouter/test/test_probe_timeout.py
index c9b48a5c..507c0c9c 100644
--- a/mcrouter/test/test_probe_timeout.py
+++ b/mcrouter/test/test_probe_timeout.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import shutil
 import time
 
diff --git a/mcrouter/test/test_rendezvous_failover.py b/mcrouter/test/test_rendezvous_failover.py
index beb83219..b19ad8fd 100644
--- a/mcrouter/test/test_rendezvous_failover.py
+++ b/mcrouter/test/test_rendezvous_failover.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import time
 
 from mcrouter.test.MCProcess import Mcrouter
diff --git a/mcrouter/test/test_routing_group_route.py b/mcrouter/test/test_routing_group_route.py
index 0d501741..f747b928 100644
--- a/mcrouter/test/test_routing_group_route.py
+++ b/mcrouter/test/test_routing_group_route.py
@@ -3,6 +3,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 from mcrouter.test.MCProcess import Memcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
diff --git a/mcrouter/test/test_routing_prefixes.py b/mcrouter/test/test_routing_prefixes.py
index 419022f3..914f7e51 100644
--- a/mcrouter/test/test_routing_prefixes.py
+++ b/mcrouter/test/test_routing_prefixes.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 import time
 
diff --git a/mcrouter/test/test_send_to_all_hosts.py b/mcrouter/test/test_send_to_all_hosts.py
index ffcd1134..26c5c5e0 100644
--- a/mcrouter/test/test_send_to_all_hosts.py
+++ b/mcrouter/test/test_send_to_all_hosts.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.MCProcess import Memcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_service_info.py b/mcrouter/test/test_service_info.py
index d0f8a484..82916dbe 100644
--- a/mcrouter/test/test_service_info.py
+++ b/mcrouter/test/test_service_info.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.MCProcess import Memcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_shadow.py b/mcrouter/test/test_shadow.py
index cccf64a9..d69531ad 100644
--- a/mcrouter/test/test_shadow.py
+++ b/mcrouter/test/test_shadow.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import time
 
 from mcrouter.test.MCProcess import Memcached
diff --git a/mcrouter/test/test_shadow_route.py b/mcrouter/test/test_shadow_route.py
index 888135b0..901af6a0 100644
--- a/mcrouter/test/test_shadow_route.py
+++ b/mcrouter/test/test_shadow_route.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 import time
 
diff --git a/mcrouter/test/test_shadow_with_file.py b/mcrouter/test/test_shadow_with_file.py
index 5489b88b..0b1c1651 100644
--- a/mcrouter/test/test_shadow_with_file.py
+++ b/mcrouter/test/test_shadow_with_file.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from time import sleep
 
 from mcrouter.test.MCProcess import Mcrouter, Memcached
diff --git a/mcrouter/test/test_shard_splits.py b/mcrouter/test/test_shard_splits.py
index b546a1e6..70d04e75 100644
--- a/mcrouter/test/test_shard_splits.py
+++ b/mcrouter/test/test_shard_splits.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import time
 
 from mcrouter.test.MCProcess import Memcached
diff --git a/mcrouter/test/test_slow_warmup.py b/mcrouter/test/test_slow_warmup.py
index cd733590..6f2bab0f 100644
--- a/mcrouter/test/test_slow_warmup.py
+++ b/mcrouter/test/test_slow_warmup.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from mcrouter.test.MCProcess import Memcached
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 
diff --git a/mcrouter/test/test_stats.py b/mcrouter/test/test_stats.py
index 4a7a7be3..4ef35078 100644
--- a/mcrouter/test/test_stats.py
+++ b/mcrouter/test/test_stats.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 from mcrouter.test.McrouterTestCase import McrouterTestCase
 from mcrouter.test.mock_servers import CustomErrorServer, SleepServer
diff --git a/mcrouter/test/test_tko_inactive.py b/mcrouter/test/test_tko_inactive.py
index 4b2d5190..a6f0713e 100644
--- a/mcrouter/test/test_tko_inactive.py
+++ b/mcrouter/test/test_tko_inactive.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import time
 
 from mcrouter.test.McrouterTestCase import McrouterTestCase
diff --git a/mcrouter/test/test_tko_reconfigure.py b/mcrouter/test/test_tko_reconfigure.py
index 1e0d6368..d55296c1 100644
--- a/mcrouter/test/test_tko_reconfigure.py
+++ b/mcrouter/test/test_tko_reconfigure.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import shutil
 import tempfile
 import time
diff --git a/mcrouter/test/test_validate_config.py b/mcrouter/test/test_validate_config.py
index e75be114..29266489 100644
--- a/mcrouter/test/test_validate_config.py
+++ b/mcrouter/test/test_validate_config.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import socket
 import time
 import unittest
diff --git a/mcrouter/test/test_warmup.py b/mcrouter/test/test_warmup.py
index b0acbc73..cf3967f1 100644
--- a/mcrouter/test/test_warmup.py
+++ b/mcrouter/test/test_warmup.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 import time
 
 from mcrouter.test.MCProcess import Memcached
diff --git a/mcrouter/test/test_warmup2.py b/mcrouter/test/test_warmup2.py
index 9c9b992d..ee65295e 100644
--- a/mcrouter/test/test_warmup2.py
+++ b/mcrouter/test/test_warmup2.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 import time
 
diff --git a/mcrouter/test/test_wch3.py b/mcrouter/test/test_wch3.py
index 2e61ffbd..50767794 100644
--- a/mcrouter/test/test_wch3.py
+++ b/mcrouter/test/test_wch3.py
@@ -4,6 +4,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 
 from collections import defaultdict