Replace partition by rpartition for parsing app_id (#523)

Summary:
To parse a address like `"addr-of-cluster-app_id"`, the old code will fail since it takes `"addr"` as the address and `"of-cluster-app_id"` as the app id.
After replace `partition` by `rpartition`, it should work as intended.

Pulled By:
d4l3k

Pull Request resolved: #523
d4l3k

Reviewed By: kurman

Differential Revision: D37187555

fbshipit-source-id: f2dd94e9722aaf29ff1edd8b0588fd04a6493e65

Author: ntlm1686

torchx/schedulers/ray_scheduler.py

@@ -8,12 +8,13 @@
 import json
 import logging
 import os
+import re
 import tempfile
 import time
 from dataclasses import dataclass, field
 from datetime import datetime
 from shutil import copy2, rmtree
-from typing import Any, cast, Dict, Iterable, List, Mapping, Optional, Set, Type  # noqa
+from typing import Any, cast, Dict, Iterable, List, Optional, Tuple  # noqa
 
 from torchx.schedulers.api import (
     AppDryRunInfo,
@@ -322,13 +323,25 @@ def wait_until_finish(self, app_id: str, timeout: int = 30) -> None:
                     break
                 time.sleep(1)
 
-        def _cancel_existing(self, app_id: str) -> None:  # pragma: no cover
+        def _parse_app_id(self, app_id: str) -> Tuple[str, str]:
+            # find index of '-' in the first :\d+-
+            m = re.search(r":\d+-", app_id)
+            if m:
+                sep = m.span()[1]
+                addr = app_id[: sep - 1]
+                app_id = app_id[sep:]
+                return addr, app_id
+
             addr, _, app_id = app_id.partition("-")
+            return addr, app_id
+
+        def _cancel_existing(self, app_id: str) -> None:  # pragma: no cover
+            addr, app_id = self._parse_app_id(app_id)
             client = JobSubmissionClient(f"http://{addr}")
             client.stop_job(app_id)
 
         def _get_job_status(self, app_id: str) -> JobStatus:
-            addr, _, app_id = app_id.partition("-")
+            addr, app_id = self._parse_app_id(app_id)
             client = JobSubmissionClient(f"http://{addr}")
             status = client.get_job_status(app_id)
             if isinstance(status, str):
@@ -375,7 +388,7 @@ def log_iter(
             streams: Optional[Stream] = None,
         ) -> Iterable[str]:
             # TODO: support tailing, streams etc..
-            addr, _, app_id = app_id.partition("-")
+            addr, app_id = self._parse_app_id(app_id)
             client: JobSubmissionClient = JobSubmissionClient(f"http://{addr}")
             logs: str = client.get_job_logs(app_id)
             iterator = split_lines(logs)

torchx/schedulers/test/ray_scheduler_test.py

@@ -298,6 +298,23 @@ def test_requirements(self) -> None:
                 job = req.request
                 self.assertEqual(job.requirements, reqs)
 
+        def test_parse_app_id(self) -> None:
+            test_addr_appid = [
+                (
+                    "0.0.0.0:1234-app_id",
+                    "0.0.0.0:1234",
+                    "app_id",
+                ),  # (full address, address:port, app_id)
+                ("addr-of-cluster:1234-app-id", "addr-of-cluster:1234", "app-id"),
+                ("www.test.com:1234-app:id", "www.test.com:1234", "app:id"),
+                ("foo", "foo", ""),
+                ("foo-bar-bar", "foo", "bar-bar"),
+            ]
+            for test_example, addr, app_id in test_addr_appid:
+                parsed_addr, parsed_appid = self._scheduler._parse_app_id(test_example)
+                self.assertEqual(parsed_addr, addr)
+                self.assertEqual(parsed_appid, app_id)
+
     class RayClusterSetup:
         _instance = None  # pyre-ignore[4]