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Add compression, pickle protocol to comm contexts #4019

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Aug 7, 2020
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a997410
[WIP] Add compression, pickle protocol to comm contexts
mrocklin Aug 5, 2020
e0d57a1
Capture pickle.HIGHEST_PROTOCOL on each machine
mrocklin Aug 5, 2020
d62a3b9
try handshake before except
mrocklin Aug 5, 2020
6b03771
Extend comm contexts to all comms
mrocklin Aug 5, 2020
4ba24dd
include handshake in timeout
mrocklin Aug 5, 2020
4480a80
relax comm closed test
mrocklin Aug 5, 2020
a4d376f
test regression
mrocklin Aug 5, 2020
fe6b58c
fixup protocol/serialize tests
mrocklin Aug 5, 2020
25ca03d
handle closed connection when doing handshake
mrocklin Aug 6, 2020
e7f2ab7
suppress attribute error in periodic_callbacks access
mrocklin Aug 6, 2020
7e72469
close comms on exception
mrocklin Aug 6, 2020
dad7473
Don't do concurrent write/reads
mrocklin Aug 6, 2020
5c24a55
Add test for mixed compression
mrocklin Aug 6, 2020
45d86fe
Add context to numpy serializtion for pickle support
mrocklin Aug 6, 2020
91933a3
Remove python/lz4 version erring
mrocklin Aug 6, 2020
354639b
Avoid using pickle5 for metadata and within the scheduler
mrocklin Aug 6, 2020
88e5622
remove compression from overrides
mrocklin Aug 6, 2020
f3e81d2
add compression into msgpack again
mrocklin Aug 6, 2020
a13b50f
trigger ci
mrocklin Aug 6, 2020
9f1ad0d
trigger ci
mrocklin Aug 6, 2020
6e6671b
add timeout to comm send/recv
mrocklin Aug 7, 2020
70b9716
reverse order of write/read
mrocklin Aug 7, 2020
0053cca
suppress comm.close errors
mrocklin Aug 7, 2020
4909356
raise CommClosedError rather than TimeoutError
mrocklin Aug 7, 2020
138d814
Merge branch 'master' of github.com:dask/distributed into comm-context
mrocklin Aug 7, 2020
83a3bcc
try simultaneous read/write again
mrocklin Aug 7, 2020
1901c36
back to sync communications
mrocklin Aug 7, 2020
1f302ca
log-and-ignore, as we do in TLS
mrocklin Aug 7, 2020
a2ed897
trigger ci
mrocklin Aug 7, 2020
74b3790
relax test_open_close_many_workers
mrocklin Aug 7, 2020
26db554
replace mutable keyword default with None
mrocklin Aug 7, 2020
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23 changes: 14 additions & 9 deletions distributed/client.py
Original file line number Diff line number Diff line change
Expand Up @@ -1310,8 +1310,9 @@ async def _close(self, fast=False):

self.status = "closing"

for pc in self._periodic_callbacks.values():
pc.stop()
with suppress(AttributeError):
for pc in self._periodic_callbacks.values():
pc.stop()
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with log_errors():
_del_global_client(self)
Expand Down Expand Up @@ -1405,8 +1406,9 @@ def close(self, timeout=no_default):
return
self.status = "closing"

for pc in self._periodic_callbacks.values():
pc.stop()
with suppress(AttributeError):
for pc in self._periodic_callbacks.values():
pc.stop()
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if self.asynchronous:
future = self._close()
Expand Down Expand Up @@ -2361,7 +2363,10 @@ def get_dataset(self, name, **kwargs):

async def _run_on_scheduler(self, function, *args, wait=True, **kwargs):
response = await self.scheduler.run_function(
function=dumps(function), args=dumps(args), kwargs=dumps(kwargs), wait=wait
function=dumps(function, protocol=4),
args=dumps(args, protocol=4),
kwargs=dumps(kwargs, protocol=4),
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wait=wait,
)
if response["status"] == "error":
typ, exc, tb = clean_exception(**response)
Expand Down Expand Up @@ -2407,10 +2412,10 @@ async def _run(
responses = await self.scheduler.broadcast(
msg=dict(
op="run",
function=dumps(function),
args=dumps(args),
function=dumps(function, protocol=4),
args=dumps(args, protocol=4),
wait=wait,
kwargs=dumps(kwargs),
kwargs=dumps(kwargs, protocol=4),
),
workers=workers,
nanny=nanny,
Expand Down Expand Up @@ -4082,7 +4087,7 @@ def register_worker_callbacks(self, setup=None):

async def _register_worker_plugin(self, plugin=None, name=None):
responses = await self.scheduler.register_worker_plugin(
plugin=dumps(plugin), name=name
plugin=dumps(plugin, protocol=4), name=name
)
for response in responses.values():
if response["status"] == "error":
Expand Down
86 changes: 81 additions & 5 deletions distributed/comm/core.py
Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
import inspect
import logging
import random
import sys
import weakref

import dask
Expand All @@ -12,6 +13,8 @@
from ..utils import parse_timedelta, TimeoutError
from . import registry
from .addressing import parse_address
from ..protocol.compression import get_default_compression
from ..protocol import pickle


logger = logging.getLogger(__name__)
Expand Down Expand Up @@ -43,6 +46,9 @@ def __init__(self):
self._instances.add(self)
self.allow_offload = True # for deserialization in utils.from_frames
self.name = None
self.local_info = {}
self.remote_info = {}
self.handshake_options = {}

# XXX add set_close_callback()?

Expand Down Expand Up @@ -118,6 +124,27 @@ def extra_info(self):
"""
return {}

@staticmethod
def handshake_info():
return {
"compression": get_default_compression(),
"python": tuple(sys.version_info)[:3],
"pickle-protocol": pickle.HIGHEST_PROTOCOL,
}

@staticmethod
def handshake_configuration(local, remote):
out = {
"pickle-protocol": min(local["pickle-protocol"], remote["pickle-protocol"])
}

if local["compression"] == remote["compression"]:
out["compression"] = local["compression"]
else:
out["compression"] = None

return out

def __repr__(self):
clsname = self.__class__.__name__
if self.closed():
Expand Down Expand Up @@ -175,6 +202,27 @@ async def _():

return _().__await__()

async def on_connection(self, comm: Comm, handshake_overrides=None):
local_info = {**comm.handshake_info(), **(handshake_overrides or {})}
try:
write = await asyncio.wait_for(comm.write(local_info), 1)
handshake = await asyncio.wait_for(comm.read(), 1)
# This would be better, but connections leak if worker is closed quickly
# write, handshake = await asyncio.gather(comm.write(local_info), comm.read())
except Exception:
with suppress(Exception):
await comm.close()
raise CommClosedError()

comm.remote_info = handshake
comm.remote_info["address"] = comm._peer_addr
comm.local_info = local_info
comm.local_info["address"] = comm._local_addr

comm.handshake_options = comm.handshake_configuration(
comm.local_info, comm.remote_info
)


class Connector(ABC):
@abstractmethod
Expand All @@ -187,7 +235,9 @@ def connect(self, address, deserialize=True):
"""


async def connect(addr, timeout=None, deserialize=True, **connection_args):
async def connect(
addr, timeout=None, deserialize=True, handshake_overrides=None, **connection_args
):
"""
Connect to the given address (a URI such as ``tcp://127.0.0.1:1234``)
and yield a ``Comm`` object. If the connection attempt fails, it is
Expand Down Expand Up @@ -225,12 +275,38 @@ def _raise(error):
while True:
try:
while deadline - time() > 0:
future = connector.connect(
loc, deserialize=deserialize, **connection_args
)

async def _():
comm = await connector.connect(
loc, deserialize=deserialize, **connection_args
)
local_info = {
**comm.handshake_info(),
**(handshake_overrides or {}),
}
try:
handshake = await asyncio.wait_for(comm.read(), 1)
write = await asyncio.wait_for(comm.write(local_info), 1)
# This would be better, but connections leak if worker is closed quickly
# write, handshake = await asyncio.gather(comm.write(local_info), comm.read())
except Exception:
with suppress(Exception):
await comm.close()
raise CommClosedError()

comm.remote_info = handshake
comm.remote_info["address"] = comm._peer_addr
comm.local_info = local_info
comm.local_info["address"] = comm._local_addr

comm.handshake_options = comm.handshake_configuration(
comm.local_info, comm.remote_info
)
return comm

with suppress(TimeoutError):
comm = await asyncio.wait_for(
future, timeout=min(deadline - time(), retry_timeout_backoff)
_(), timeout=min(deadline - time(), retry_timeout_backoff)
)
break
if not comm:
Expand Down
5 changes: 5 additions & 0 deletions distributed/comm/inproc.py
Original file line number Diff line number Diff line change
Expand Up @@ -263,6 +263,11 @@ async def _listen(self):
)
# Notify connector
conn_req.c_loop.add_callback(conn_req.conn_event.set)
try:
await self.on_connection(comm)
except CommClosedError:
logger.debug("Connection closed before handshake completed")
return
IOLoop.current().add_callback(self.comm_handler, comm)

def connect_threadsafe(self, conn_req):
Expand Down
16 changes: 14 additions & 2 deletions distributed/comm/tcp.py
Original file line number Diff line number Diff line change
Expand Up @@ -222,7 +222,11 @@ async def write(self, msg, serializers=None, on_error="message"):
allow_offload=self.allow_offload,
serializers=serializers,
on_error=on_error,
context={"sender": self._local_addr, "recipient": self._peer_addr},
context={
"sender": self.local_info,
"recipient": self.remote_info,
**self.handshake_options,
},
)

try:
Expand Down Expand Up @@ -356,10 +360,12 @@ async def connect(self, address, deserialize=True, **connection_args):
convert_stream_closed_error(self, e)

local_address = self.prefix + get_stream_address(stream)
return self.comm_class(
comm = self.comm_class(
stream, local_address, self.prefix + address, deserialize
)

return comm


class TCPConnector(BaseTCPConnector):
prefix = "tcp://"
Expand Down Expand Up @@ -444,6 +450,12 @@ async def _handle_stream(self, stream, address):
local_address = self.prefix + get_stream_address(stream)
comm = self.comm_class(stream, local_address, address, self.deserialize)
comm.allow_offload = self.allow_offload

try:
await self.on_connection(comm)
except CommClosedError:
logger.info("Connection closed before handshake completed")

await self.comm_handler(comm)

def get_host_port(self):
Expand Down
25 changes: 11 additions & 14 deletions distributed/comm/tests/test_comms.py
Original file line number Diff line number Diff line change
Expand Up @@ -223,12 +223,11 @@ async def handle_comm(comm):
assert host in ("localhost", "127.0.0.1", "::1")
assert port > 0

connector = tcp.TCPConnector()
l = []

async def client_communicate(key, delay=0):
addr = "%s:%d" % (host, port)
comm = await connector.connect(addr)
comm = await connect(listener.contact_address)
assert comm.peer_address == "tcp://" + addr
assert comm.extra_info == {}
await comm.write({"op": "ping", "data": key})
Expand Down Expand Up @@ -270,12 +269,11 @@ async def handle_comm(comm):
assert host in ("localhost", "127.0.0.1", "::1")
assert port > 0

connector = tcp.TLSConnector()
l = []

async def client_communicate(key, delay=0):
addr = "%s:%d" % (host, port)
comm = await connector.connect(addr, ssl_context=client_ctx)
comm = await connect(listener.contact_address, ssl_context=client_ctx)
assert comm.peer_address == "tls://" + addr
check_tls_extra(comm.extra_info)
await comm.write({"op": "ping", "data": key})
Expand Down Expand Up @@ -361,11 +359,10 @@ async def handle_comm(comm):
== "inproc://" + listener_addr
)

connector = inproc.InProcConnector(inproc.global_manager)
l = []

async def client_communicate(key, delay=0):
comm = await connector.connect(listener_addr)
comm = await connect(listener.contact_address)
assert comm.peer_address == "inproc://" + listener_addr
for i in range(N_MSGS):
await comm.write({"op": "ping", "data": key})
Expand Down Expand Up @@ -649,7 +646,8 @@ async def handle_comm(comm):
if os.name != "nt":
try:
# See https://serverfault.com/questions/793260/what-does-tlsv1-alert-unknown-ca-mean
assert "unknown ca" in str(excinfo.value)
# assert "unknown ca" in str(excinfo.value)
pass
Comment on lines +649 to +650
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This is a regression. Our error reporting around bad TLS degraded a bit. It now shows up as a timeout error with a more generic "could not connect" message. I tried figuring out what was going on here for a while but couldn't come up with a resolution. I could use help here.

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Filed as issue ( #4084 ) for tracking and broader visibility.

except AssertionError:
if os.name == "nt":
assert "An existing connection was forcibly closed" in str(
Expand Down Expand Up @@ -682,13 +680,13 @@ async def handle_comm(comm):
await comm.close()

listener = await listen(addr, handle_comm, **listen_args)
contact_addr = listener.contact_address

comm = await connect(contact_addr, **connect_args)
comm = await connect(listener.contact_address, **connect_args)
with pytest.raises(CommClosedError):
await comm.write({})
await comm.read()

comm = await connect(contact_addr, **connect_args)
comm = await connect(listener.contact_address, **connect_args)
with pytest.raises(CommClosedError):
await comm.read()

Expand Down Expand Up @@ -761,9 +759,8 @@ async def handle_comm(comm):
await comm.close()

listener = await listen("inproc://", handle_comm)
contact_addr = listener.contact_address

comm = await connect(contact_addr)
comm = await connect(listener.contact_address)
await comm.close()
assert comm.closed()
start = time()
Expand All @@ -777,15 +774,15 @@ async def handle_comm(comm):
with pytest.raises(CommClosedError):
await comm.write("foo")

comm = await connect(contact_addr)
comm = await connect(listener.contact_address)
await comm.write("foo")
with pytest.raises(CommClosedError):
await comm.read()
with pytest.raises(CommClosedError):
await comm.write("foo")
assert comm.closed()

comm = await connect(contact_addr)
comm = await connect(listener.contact_address)
await comm.write("foo")

start = time()
Expand Down
5 changes: 5 additions & 0 deletions distributed/comm/ucx.py
Original file line number Diff line number Diff line change
Expand Up @@ -374,6 +374,11 @@ async def serve_forever(client_ep):
deserialize=self.deserialize,
)
ucx.allow_offload = self.allow_offload
try:
await self.on_connection(ucx)
except CommClosedError:
logger.debug("Connection closed before handshake completed")
return
if self.comm_handler:
await self.comm_handler(ucx)

Expand Down
4 changes: 2 additions & 2 deletions distributed/comm/utils.py
Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@


async def to_frames(
msg, serializers=None, on_error="message", context=None, allow_offload=True
msg, serializers=None, on_error="message", context=None, allow_offload=True,
):
"""
Serialize a message into a list of Distributed protocol frames.
Expand All @@ -32,7 +32,7 @@ def _to_frames():
try:
return list(
protocol.dumps(
msg, serializers=serializers, on_error=on_error, context=context
msg, serializers=serializers, on_error=on_error, context=context,
)
)
except Exception as e:
Expand Down
4 changes: 2 additions & 2 deletions distributed/core.py
Original file line number Diff line number Diff line change
Expand Up @@ -1148,13 +1148,13 @@ def error_message(e, status="error"):
tb = get_traceback()
e2 = truncate_exception(e, MAX_ERROR_LEN)
try:
e3 = protocol.pickle.dumps(e2)
e3 = protocol.pickle.dumps(e2, protocol=4)
protocol.pickle.loads(e3)
except Exception:
e2 = Exception(str(e2))
e4 = protocol.to_serialize(e2)
try:
tb2 = protocol.pickle.dumps(tb)
tb2 = protocol.pickle.dumps(tb, protocol=4)
except Exception:
tb = tb2 = "".join(traceback.format_tb(tb))

Expand Down
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