[iris] Ignore unknown inherited constraint fields

Author: dlwh

lib/iris/src/iris/cluster/client/job_info.py

@@ -109,7 +109,12 @@ def get_job_info() -> JobInfo | None:
         constraints: list[Constraint] = []
         if constraints_json:
             for item in json.loads(constraints_json):
-                constraints.append(Constraint.from_proto(json_format.ParseDict(item, cluster_pb2.Constraint())))
+                constraint_proto = json_format.ParseDict(
+                    item,
+                    cluster_pb2.Constraint(),
+                    ignore_unknown_fields=True,
+                )
+                constraints.append(Constraint.from_proto(constraint_proto))
 
         info = JobInfo(
             task_id=task_id,

lib/iris/tests/cluster/client/test_job_info.py

@@ -79,6 +79,23 @@ def test_get_job_info_accepts_legacy_iris_job_id_env(monkeypatch):
     set_job_info(None)
 
 
+def test_get_job_info_ignores_unknown_constraint_fields(monkeypatch):
+    set_job_info(None)
+    monkeypatch.delenv("IRIS_JOB_ID", raising=False)
+    monkeypatch.setenv("IRIS_TASK_ID", "/alice/train/0:0")
+    monkeypatch.setenv(
+        "IRIS_JOB_CONSTRAINTS",
+        '[{"key":"region","op":0,"mode":"cohort"}]',
+    )
+
+    info = get_job_info()
+
+    assert info is not None
+    assert len(info.constraints) == 1
+    assert info.constraints[0].key == "region"
+    set_job_info(None)
+
+
 def test_worker_region_from_env(monkeypatch):
     """IRIS_WORKER_REGION is read into JobInfo.worker_region."""
     set_job_info(None)