Revert "RPC retries (second PR) (#3324)"

This reverts commit 67f4ba4.

Author: Jon Wayne Parrott

bigtable/google/cloud/bigtable/retry.py

@@ -274,9 +274,6 @@ def consume_next(self):
 
             self._validate_chunk(chunk)
 
-            if hasattr(self._response_iterator, 'set_start_key'):
-                self._response_iterator.set_start_key(chunk.row_key)
-
             if chunk.reset_row:
                 row = self._row = None
                 cell = self._cell = self._previous_cell = None

bigtable/google/cloud/bigtable/row_data.py

@@ -17,6 +17,7 @@
 
 import six
 
+from google.cloud._helpers import _to_bytes
 from google.cloud.bigtable._generated import (
     bigtable_pb2 as data_messages_v2_pb2)
 from google.cloud.bigtable._generated import (
@@ -29,26 +30,6 @@
 from google.cloud.bigtable.row import ConditionalRow
 from google.cloud.bigtable.row import DirectRow
 from google.cloud.bigtable.row_data import PartialRowsData
-from google.gax import RetryOptions, BackoffSettings
-from google.cloud.bigtable.retry import ReadRowsIterator, _create_row_request
-from grpc import StatusCode
-
-BACKOFF_SETTINGS = BackoffSettings(
-    initial_retry_delay_millis=10,
-    retry_delay_multiplier=1.3,
-    max_retry_delay_millis=30000,
-    initial_rpc_timeout_millis=25 * 60 * 1000,
-    rpc_timeout_multiplier=1.0,
-    max_rpc_timeout_millis=25 * 60 * 1000,
-    total_timeout_millis=30 * 60 * 1000
-)
-
-RETRY_CODES = [
-    StatusCode.DEADLINE_EXCEEDED,
-    StatusCode.ABORTED,
-    StatusCode.INTERNAL,
-    StatusCode.UNAVAILABLE
-]
 
 
 # Maximum number of mutations in bulk (MutateRowsRequest message):
@@ -276,7 +257,7 @@ def read_row(self, row_key, filter_=None):
         return rows_data.rows[row_key]
 
     def read_rows(self, start_key=None, end_key=None, limit=None,
-                  filter_=None, backoff_settings=None):
+                  filter_=None):
         """Read rows from this table.
 
         :type start_key: bytes
@@ -303,18 +284,13 @@ def read_rows(self, start_key=None, end_key=None, limit=None,
         :returns: A :class:`.PartialRowsData` convenience wrapper for consuming
                   the streamed results.
         """
+        request_pb = _create_row_request(
+            self.name, start_key=start_key, end_key=end_key, filter_=filter_,
+            limit=limit)
         client = self._instance._client
-        if backoff_settings is None:
-            backoff_settings = BACKOFF_SETTINGS
-        RETRY_OPTIONS = RetryOptions(
-            retry_codes=RETRY_CODES,
-            backoff_settings=backoff_settings
-        )
-
-        retrying_iterator = ReadRowsIterator(client, self.name, start_key,
-                                             end_key, filter_, limit,
-                                             RETRY_OPTIONS)
-        return PartialRowsData(retrying_iterator)
+        response_iterator = client._data_stub.ReadRows(request_pb)
+        # We expect an iterator of `data_messages_v2_pb2.ReadRowsResponse`
+        return PartialRowsData(response_iterator)
 
     def mutate_rows(self, rows):
         """Mutates multiple rows in bulk.
@@ -383,6 +359,67 @@ def sample_row_keys(self):
         return response_iterator
 
 
+def _create_row_request(table_name, row_key=None, start_key=None, end_key=None,
+                        filter_=None, limit=None):
+    """Creates a request to read rows in a table.
+
+    :type table_name: str
+    :param table_name: The name of the table to read from.
+
+    :type row_key: bytes
+    :param row_key: (Optional) The key of a specific row to read from.
+
+    :type start_key: bytes
+    :param start_key: (Optional) The beginning of a range of row keys to
+                      read from. The range will include ``start_key``. If
+                      left empty, will be interpreted as the empty string.
+
+    :type end_key: bytes
+    :param end_key: (Optional) The end of a range of row keys to read from.
+                    The range will not include ``end_key``. If left empty,
+                    will be interpreted as an infinite string.
+
+    :type filter_: :class:`.RowFilter`
+    :param filter_: (Optional) The filter to apply to the contents of the
+                    specified row(s). If unset, reads the entire table.
+
+    :type limit: int
+    :param limit: (Optional) The read will terminate after committing to N
+                  rows' worth of results. The default (zero) is to return
+                  all results.
+
+    :rtype: :class:`data_messages_v2_pb2.ReadRowsRequest`
+    :returns: The ``ReadRowsRequest`` protobuf corresponding to the inputs.
+    :raises: :class:`ValueError <exceptions.ValueError>` if both
+             ``row_key`` and one of ``start_key`` and ``end_key`` are set
+    """
+    request_kwargs = {'table_name': table_name}
+    if (row_key is not None and
+            (start_key is not None or end_key is not None)):
+        raise ValueError('Row key and row range cannot be '
+                         'set simultaneously')
+    range_kwargs = {}
+    if start_key is not None or end_key is not None:
+        if start_key is not None:
+            range_kwargs['start_key_closed'] = _to_bytes(start_key)
+        if end_key is not None:
+            range_kwargs['end_key_open'] = _to_bytes(end_key)
+    if filter_ is not None:
+        request_kwargs['filter'] = filter_.to_pb()
+    if limit is not None:
+        request_kwargs['rows_limit'] = limit
+
+    message = data_messages_v2_pb2.ReadRowsRequest(**request_kwargs)
+
+    if row_key is not None:
+        message.rows.row_keys.append(_to_bytes(row_key))
+
+    if range_kwargs:
+        message.rows.row_ranges.add(**range_kwargs)
+
+    return message
+
+
 def _mutate_rows_request(table_name, rows):
     """Creates a request to mutate rows in a table.