read hdfs

recommend-model-produce/src/main/python/models/dssm/bq_reader_train_ps.py

@@ -49,9 +49,12 @@ class DSSMReader(MultiSlotDataGenerator):
         return reader
 
 if __name__ == "__main__":
+    print("invoke DSSMReader")
     reader = DSSMReader()
     reader.init()
     try:
+        print("invoke run_from_stdin start")
         reader.run_from_stdin()
+        print("invoke run_from_stdin end")
     except Exception as e:
         sys.stderr.write(f"Error in main: {str(e)}\n")