HyukjinKwon commented on code in PR #50466:
URL: https://github.com/apache/spark/pull/50466#discussion_r2027863851
##########
python/pyspark/sql/streaming/stateful_processor_api_client.py:
##########
@@ -49,22 +49,26 @@ class StatefulProcessorHandleState(Enum):
class StatefulProcessorApiClient:
def __init__(
- self, state_server_port: int, key_schema: StructType, is_driver: bool
= False
+ self, state_server_port: Union[int, str], key_schema: StructType,
is_driver: bool = False
) -> None:
self.key_schema = key_schema
- self._client_socket = socket.socket()
- self._client_socket.connect(("localhost", state_server_port))
-
- # SPARK-51667: We have a pattern of sending messages continuously from
one side
- # (Python -> JVM, and vice versa) before getting response from other
side. Since most
- # messages we are sending are small, this triggers the bad combination
of Nagle's algorithm
- # and delayed ACKs, which can cause a significant delay on the latency.
- # See SPARK-51667 for more details on how this can be a problem.
- #
- # Disabling either would work, but it's more common to disable Nagle's
algorithm; there is
- # lot less reference to disabling delayed ACKs, while there are lots
of resources to
- # disable Nagle's algorithm.
- self._client_socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY,
1)
+ if isinstance(state_server_port, str):
+ self._client_socket = socket.socket(socket.AF_UNIX,
socket.SOCK_STREAM)
+ self._client_socket.connect(state_server_port)
+ else:
+ self._client_socket = socket.socket()
+ self._client_socket.connect(("localhost", state_server_port))
+
+ # SPARK-51667: We have a pattern of sending messages continuously
from one side
+ # (Python -> JVM, and vice versa) before getting response from
other side. Since most
+ # messages we are sending are small, this triggers the bad
combination of Nagle's
+ # algorithm and delayed ACKs, which can cause a significant delay
on the latency.
+ # See SPARK-51667 for more details on how this can be a problem.
+ #
+ # Disabling either would work, but it's more common to disable
Nagle's algorithm; there
+ # is lot less reference to disabling delayed ACKs, while there are
lots of resources to
+ # disable Nagle's algorithm.
+ self._client_socket.setsockopt(socket.IPPROTO_TCP,
socket.TCP_NODELAY, 1)
Review Comment:
This is unsupported by UDS. This was more an improvement in its performance
so I think it's fine cc @HeartSaVioR FYI
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