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# Owner(s): ["oncall: r2p"]
# Copyright (c) Facebook, Inc. and its affiliates.
# All rights reserved.
#
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.
import subprocess
from base64 import b64encode
from typing import ClassVar, cast
from unittest import TestCase
from etcd import EtcdKeyNotFound # type: ignore[import]
from torch.distributed.elastic.rendezvous import RendezvousConnectionError, RendezvousParameters
from torch.distributed.elastic.rendezvous.etcd_rendezvous_backend import (
EtcdRendezvousBackend,
create_backend,
)
from torch.distributed.elastic.rendezvous.etcd_server import EtcdServer
from torch.distributed.elastic.rendezvous.etcd_store import EtcdStore
from rendezvous_backend_test import RendezvousBackendTestMixin
class EtcdRendezvousBackendTest(TestCase, RendezvousBackendTestMixin):
_server: ClassVar[EtcdServer]
@classmethod
def setUpClass(cls) -> None:
cls._server = EtcdServer()
cls._server.start(stderr=subprocess.DEVNULL)
@classmethod
def tearDownClass(cls) -> None:
cls._server.stop()
def setUp(self) -> None:
self._client = self._server.get_client()
# Make sure we have a clean slate.
try:
self._client.delete("/dummy_prefix", recursive=True, dir=True)
except EtcdKeyNotFound:
pass
self._backend = EtcdRendezvousBackend(self._client, "dummy_run_id", "/dummy_prefix")
def _corrupt_state(self) -> None:
self._client.write("/dummy_prefix/dummy_run_id", "non_base64")
class CreateBackendTest(TestCase):
_server: ClassVar[EtcdServer]
@classmethod
def setUpClass(cls) -> None:
cls._server = EtcdServer()
cls._server.start(stderr=subprocess.DEVNULL)
@classmethod
def tearDownClass(cls) -> None:
cls._server.stop()
def setUp(self) -> None:
self._params = RendezvousParameters(
backend="dummy_backend",
endpoint=self._server.get_endpoint(),
run_id="dummy_run_id",
min_nodes=1,
max_nodes=1,
protocol="hTTp",
read_timeout="10",
)
self._expected_read_timeout = 10
def test_create_backend_returns_backend(self) -> None:
backend, store = create_backend(self._params)
self.assertEqual(backend.name, "etcd-v2")
self.assertIsInstance(store, EtcdStore)
etcd_store = cast(EtcdStore, store)
self.assertEqual(etcd_store.client.read_timeout, self._expected_read_timeout) # type: ignore[attr-defined]
client = self._server.get_client()
backend.set_state(b"dummy_state")
result = client.get("/torch/elastic/rendezvous/" + self._params.run_id)
self.assertEqual(result.value, b64encode(b"dummy_state").decode())
self.assertLessEqual(result.ttl, 7200)
store.set("dummy_key", "dummy_value")
result = client.get("/torch/elastic/store/" + b64encode(b"dummy_key").decode())
self.assertEqual(result.value, b64encode(b"dummy_value").decode())
def test_create_backend_returns_backend_if_protocol_is_not_specified(self) -> None:
del self._params.config["protocol"]
self.test_create_backend_returns_backend()
def test_create_backend_returns_backend_if_read_timeout_is_not_specified(self) -> None:
del self._params.config["read_timeout"]
self._expected_read_timeout = 60
self.test_create_backend_returns_backend()
def test_create_backend_raises_error_if_etcd_is_unreachable(self) -> None:
self._params.endpoint = "dummy:1234"
with self.assertRaisesRegex(
RendezvousConnectionError,
r"^The connection to etcd has failed. See inner exception for details.$",
):
create_backend(self._params)
def test_create_backend_raises_error_if_protocol_is_invalid(self) -> None:
self._params.config["protocol"] = "dummy"
with self.assertRaisesRegex(ValueError, r"^The protocol must be HTTP or HTTPS.$"):
create_backend(self._params)
def test_create_backend_raises_error_if_read_timeout_is_invalid(self) -> None:
for read_timeout in ["0", "-10"]:
with self.subTest(read_timeout=read_timeout):
self._params.config["read_timeout"] = read_timeout
with self.assertRaisesRegex(
ValueError, r"^The read timeout must be a positive integer.$"
):
create_backend(self._params)
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