Increase aiohttp read buffer to 2MiB (#138)

The previous default (64KiB) would cause `ValueError: Line is too long`
exceptions on watch events with large objects.

Requires aiohttp >= 3.7.0

kubernetes_asyncio/client/rest.py

@@ -78,7 +78,14 @@ def __init__(self, configuration, pools_size=4, maxsize=None):
 
         # https pool manager
         self.pool_manager = aiohttp.ClientSession(
-            connector=connector
+            connector=connector,
+            # Watch events containing large resource objects can exceed
+            # aiohttp's default read buffer size.
+            #
+            # There is no hard-limit defined by k8s, but the etcd default
+            # maximum request size is 1.5MiB.
+            # https://github.com/kubernetes/kubernetes/issues/19781
+            read_bufsize=2**21
         )
 
     async def close(self):

requirements.txt

@@ -4,4 +4,4 @@ python-dateutil>=2.5.3  # BSD
 setuptools>=21.0.0  # PSF/ZPL
 urllib3>=1.24.2  # MIT
 pyyaml>=3.12  # MIT
-aiohttp>=2.3.10,<4.0.0 # # Apache-2.0
+aiohttp>=3.7.0,<4.0.0 # # Apache-2.0