fix: poll job.status() once per job in Experiment.status() (#582)

Experiment.status() called job.status(runner=...) twice while building
one status row: once for the display text and again for the returned
dictionary. A backend failure therefore produced two identical ERROR
tracebacks per status request and wasted a redundant status poll.

Store the status in a local variable and reuse it for both the display
string and the dict.

Add a regression test that asserts job.status() is called exactly once
for both return_dict=True and the default print path.

Signed-off-by: Andrew White <andrewh@cdw.com>
Co-authored-by: oliver könig <okoenig@nvidia.com>

Author: andrewwhitecdw

nemo_run/run/experiment.py

@@ -908,10 +908,9 @@ def _get_job_info_and_dict(
             idx: int, job: Job | JobGroup
         ) -> tuple[list[str], dict[str, str]]:
             job_info = []
+            job_status = job.status(runner=self._runner)
             job_info.append(f"[bold green]Task {idx}[/bold green]: [bold orange1]{job.id}")
-            job_info.append(
-                f"- [bold green]Status[/bold green]: {str(job.status(runner=self._runner))}"
-            )
+            job_info.append(f"- [bold green]Status[/bold green]: {str(job_status)}")
             job_info.append(f"- [bold green]Executor[/bold green]: {job.executor.info()}")
 
             try:
@@ -927,7 +926,7 @@ def _get_job_info_and_dict(
             ]
             job_dict = {
                 "name": job.id,
-                "status": job.status(runner=self._runner),
+                "status": job_status,
                 "executor": job.executor.info(),
                 "job_id": app_id,
                 "handle": job.handle,

test/run/test_experiment.py

@@ -684,6 +684,30 @@ def test_experiment_status(mock_get_runner, temp_dir):
             mock_print.assert_called()
 
 
+@patch("nemo_run.run.experiment.get_runner")
+def test_experiment_status_polls_job_once(mock_get_runner, temp_dir):
+    """Experiment.status() should call job.status() once per job.
+
+    Previously the display text and returned dict each called job.status(),
+    producing duplicate backend requests (and duplicate error logs on failure).
+    """
+    mock_runner = MagicMock()
+    mock_get_runner.return_value = mock_runner
+
+    with Experiment("test-exp") as exp:
+        task = run.Partial(dummy_function, x=1, y=2)
+        exp.add(task, name="test-job")
+        exp.jobs[0].status = MagicMock(return_value=AppState.SUCCEEDED)
+
+        exp.status(return_dict=True)
+        exp.jobs[0].status.assert_called_once_with(runner=mock_runner)
+
+        exp.jobs[0].status.reset_mock()
+        with patch.object(exp.console, "print"):
+            exp.status()
+        exp.jobs[0].status.assert_called_once_with(runner=mock_runner)
+
+
 @patch("nemo_run.run.experiment.get_runner")
 def test_experiment_cancel(mock_get_runner, temp_dir):
     """Test cancelling an experiment job."""