fix: cancel pending tasks when any chunk processing fails

Modify extract_entities function to terminate all pending text chunk processing tasks when any single chunk processing fails.

lightrag/operate.py

@@ -666,8 +666,33 @@ async def extract_entities(
         return maybe_nodes, maybe_edges
 
     # Handle all chunks in parallel and collect results
-    tasks = [_process_single_content(c) for c in ordered_chunks]
-    chunk_results = await asyncio.gather(*tasks)
+    # Create tasks for all chunks
+    tasks = []
+    for c in ordered_chunks:
+        task = asyncio.create_task(_process_single_content(c))
+        tasks.append(task)
+
+    # Wait for tasks to complete or for the first exception to occur
+    # This allows us to cancel remaining tasks if any task fails
+    done, pending = await asyncio.wait(tasks, return_when=asyncio.FIRST_EXCEPTION)
+
+    # Check if any task raised an exception
+    for task in done:
+        if task.exception():
+            # If a task failed, cancel all pending tasks
+            # This prevents unnecessary processing since the parent function will abort anyway
+            for pending_task in pending:
+                pending_task.cancel()
+
+            # Wait for cancellation to complete
+            if pending:
+                await asyncio.wait(pending)
+
+            # Re-raise the exception to notify the caller
+            raise task.exception()
+
+    # If all tasks completed successfully, collect results
+    chunk_results = [task.result() for task in tasks]
 
     # Collect all nodes and edges from all chunks
     all_nodes = defaultdict(list)