PYTHON-5059 Update default maxMessageSizeBytes and maxWriteBatchSize

Author: ShaneHarvey

pymongo/common.py

@@ -60,10 +60,10 @@
 
 # Defaults until we connect to a server and get updated limits.
 MAX_BSON_SIZE = 16 * (1024**2)
-MAX_MESSAGE_SIZE: int = 2 * MAX_BSON_SIZE
+MAX_MESSAGE_SIZE = 48 * 1000 * 1000
 MIN_WIRE_VERSION = 0
 MAX_WIRE_VERSION = 0
-MAX_WRITE_BATCH_SIZE = 1000
+MAX_WRITE_BATCH_SIZE = 100000
 
 # What this version of PyMongo supports.
 MIN_SUPPORTED_SERVER_VERSION = "4.0"

pymongo/hello.py

@@ -133,7 +133,7 @@ def max_bson_size(self) -> int:
 
     @property
     def max_message_size(self) -> int:
-        return self._doc.get("maxMessageSizeBytes", 2 * self.max_bson_size)
+        return self._doc.get("maxMessageSizeBytes", common.MAX_MESSAGE_SIZE)
 
     @property
     def max_write_batch_size(self) -> int: