[Data] Fix bug where Ray Data incorrectly emits progress bar warning

python/ray/data/_internal/progress_bar.py

@@ -118,12 +118,6 @@ def _truncate_name(self, name: str) -> str:
         ):
             return name
 
-        if log_once("ray_data_truncate_operator_name"):
-            logger.warning(
-                f"Truncating long operator name to {self.MAX_NAME_LENGTH} characters."
-                "To disable this behavior, set `ray.data.DataContext.get_current()."
-                "DEFAULT_ENABLE_PROGRESS_BAR_NAME_TRUNCATION = False`."
-            )
         op_names = name.split("->")
         if len(op_names) == 1:
             return op_names[0]
@@ -141,6 +135,13 @@ def _truncate_name(self, name: str) -> str:
                 + len(op_names[-1])
             ) > self.MAX_NAME_LENGTH:
                 truncated_op_names.append("...")
+                if log_once("ray_data_truncate_operator_name"):
+                    logger.warning(
+                        f"Truncating long operator name to {self.MAX_NAME_LENGTH} "
+                        "characters. To disable this behavior, set "
+                        "`ray.data.DataContext.get_current()."
+                        "DEFAULT_ENABLE_PROGRESS_BAR_NAME_TRUNCATION = False`."
+                    )
                 break
             truncated_op_names.append(op_name)
         truncated_op_names.append(op_names[-1])
@@ -199,6 +200,9 @@ def set_description(self, name: str) -> None:
             self._desc = name
             self._bar.set_description(self._desc)
 
+    def get_description(self) -> str:
+        return self._desc
+
     def refresh(self):
         if self._bar:
             self._bar.refresh()

python/ray/data/tests/test_progress_bar.py

@@ -1,4 +1,6 @@
 import functools
+import logging
+from unittest.mock import patch
 
 import pytest
 from pytest import fixture
@@ -39,7 +41,7 @@ def wrapped_close():
         bar.close = wrapped_close
 
     # Test basic usage
-    pb = ProgressBar("", total, "", enabled=True)
+    pb = ProgressBar("", total, "unit", enabled=True)
     assert pb._bar is not None
     patch_close(pb._bar)
     for _ in range(total):
@@ -50,7 +52,7 @@ def wrapped_close():
     assert total_at_close == total
 
     # Test if update() exceeds the original total, the total will be updated.
-    pb = ProgressBar("", total, "", enabled=True)
+    pb = ProgressBar("", total, "unit", enabled=True)
     assert pb._bar is not None
     patch_close(pb._bar)
     new_total = total * 2
@@ -62,7 +64,7 @@ def wrapped_close():
     assert total_at_close == new_total
 
     # Test that if the bar is not complete at close(), the total will be updated.
-    pb = ProgressBar("", total, "")
+    pb = ProgressBar("", total, "unit")
     assert pb._bar is not None
     patch_close(pb._bar)
     new_total = total // 2
@@ -74,7 +76,7 @@ def wrapped_close():
     assert total_at_close == new_total
 
     # Test updating the total
-    pb = ProgressBar("", total, "", enabled=True)
+    pb = ProgressBar("", total, "unit", enabled=True)
     assert pb._bar is not None
     patch_close(pb._bar)
     new_total = total * 2
@@ -84,3 +86,40 @@ def wrapped_close():
     pb.update(total + 1, total)
     assert pb._bar.total == total + 1
     pb.close()
+
+
+@pytest.mark.parametrize(
+    "name, expected_description, max_line_length, should_emit_warning",
+    [
+        ("Op", "Op", 2, False),
+        ("Op->Op", "Op->Op", 5, False),
+        ("Op->Op->Op", "Op->...->Op", 9, True),
+        ("Op->Op->Op", "Op->Op->Op", 10, False),
+        # Test case for https://github.com/ray-project/ray/issues/47679.
+        ("spam", "spam", 1, False),
+    ],
+)
+def test_progress_bar_truncates_chained_operators(
+    name,
+    expected_description,
+    max_line_length,
+    should_emit_warning,
+    caplog,
+    propagate_logs,
+):
+    with patch.object(ProgressBar, "MAX_NAME_LENGTH", max_line_length):
+        pb = ProgressBar(name, None, "unit")
+
+    assert pb.get_description() == expected_description
+    if should_emit_warning:
+        assert any(
+            record.levelno == logging.WARNING
+            and "Truncating long operator name" in record.message
+            for record in caplog.records
+        ), caplog.records
+
+
+if __name__ == "__main__":
+    import sys
+
+    sys.exit(pytest.main(["-v", __file__]))