Improved message for GetChunkError (#2844)

Improved message for GetChunkError

deeplake/core/chunk_engine.py

@@ -603,7 +603,7 @@ def get_chunk_from_chunk_id(
                 chunk = self.copy_chunk_to_new_commit(chunk, chunk_name)
             return chunk
         except Exception as e:
-            raise GetChunkError(chunk_key) from e
+            raise GetChunkError(chunk_key, cause=e) from e
 
     def get_video_chunk(self, chunk_id, copy: bool = False):
         """Returns video chunks. Chunk will contain presigned url to the video instead of data if the chunk is large."""
@@ -2298,7 +2298,7 @@ def _get_samples(
                 else:
                     sample = self.get_single_sample(idx, index, pad_tensor=pad_tensor)
             except GetChunkError as e:
-                raise GetChunkError(e.chunk_key, idx, self.name) from e
+                raise GetChunkError(e.chunk_key, idx, self.name, e) from e
             except ReadSampleFromChunkError as e:
                 raise ReadSampleFromChunkError(e.chunk_key, idx, self.name) from e
             check_sample_shape(sample.shape, last_shape, self.key, index, aslist)
@@ -2396,7 +2396,7 @@ def _numpy(
                         )
                     except GetChunkError as e:
                         raise GetChunkError(
-                            e.chunk_key, global_sample_index, self.name
+                            e.chunk_key, global_sample_index, self.name, e
                         ) from e
                     except ReadSampleFromChunkError as e:
                         raise ReadSampleFromChunkError(

deeplake/util/exceptions.py

@@ -993,8 +993,14 @@ def __init__(
         chunk_key: Optional[str],
         global_index: Optional[int] = None,
         tensor_name: Optional[str] = None,
+        cause: Optional[Exception] = None,
     ):
+        self.root_cause = cause
         self.chunk_key = chunk_key
+
+        if isinstance(cause, GetChunkError):
+            self.root_cause = cause.root_cause
+
         message = "Unable to get chunk"
         if chunk_key is not None:
             message += f" '{chunk_key}'"
@@ -1003,6 +1009,14 @@ def __init__(
         if tensor_name is not None:
             message += f" in tensor {tensor_name}"
         message += "."
+
+        if cause is not None:
+            cause_message = str(cause)
+            if isinstance(cause, KeyError):
+                cause_message = f"The file {cause} does not exist."
+
+            message += f" Root Cause: {cause_message}"
+
         super().__init__(message)