args = (session: "projects/python-docs-samples-tests/instances/test-instance-de336724ab/databases/test-db-b65db26a15/sessions...ey: "end_title"
  value {
    code: STRING
  }
}
param_types {
  key: "start_title"
  value {
    code: STRING
  }
}
,)
kwargs = {'metadata': [('google-cloud-resource-prefix', 'projects/python-docs-samples-tests/instances/test-instance-de336724ab/...S_aKJxWE75Er_B33IVBw'), ('x-goog-api-client', 'gl-python/3.8.8 grpc/1.38.1 gax/1.30.0 gccl/3.6.0')], 'timeout': 3600.0}
result = <_MultiThreadedRendezvous of RPC that terminated with:
	status = StatusCode.INVALID_ARGUMENT
	details = "The index Alb..._line":1066,"grpc_message":"The index AlbumsByAlbumTitle cannot be used because it is in backfill.","grpc_status":3}"
>
prefetch_first = True
@general_helpers.wraps(callable_)
def error_remapped_callable(*args, **kwargs):
    try:
        result = callable_(*args, **kwargs)
        # Auto-fetching the first result causes PubSub client's streaming pull
        # to hang when re-opening the stream, thus we need examine the hacky
        # hidden flag to see if pre-fetching is disabled.
        # https://github.com/googleapis/python-pubsub/issues/93#issuecomment-630762257
        prefetch_first = getattr(callable_, "_prefetch_first_result_", True)


      return _StreamingResponseIterator(result, prefetch_first_result=prefetch_first)


.nox/py-3-8/lib/python3.8/site-packages/google/api_core/grpc_helpers.py:160:

self = <google.api_core.grpc_helpers._StreamingResponseIterator object at 0x7f9e23554880>

wrapped = <_MultiThreadedRendezvous of RPC that terminated with:

status = StatusCode.INVALID_ARGUMENT

details = "The index Alb..._line":1066,"grpc_message":"The index AlbumsByAlbumTitle cannot be used because it is in backfill.","grpc_status":3}"


prefetch_first_result = True
def __init__(self, wrapped, prefetch_first_result=True):
    self._wrapped = wrapped

    # This iterator is used in a retry context, and returned outside after init.
    # gRPC will not throw an exception until the stream is consumed, so we need
    # to retrieve the first result, in order to fail, in order to trigger a retry.
    try:
        if prefetch_first_result:


          self._stored_first_result = six.next(self._wrapped)


.nox/py-3-8/lib/python3.8/site-packages/google/api_core/grpc_helpers.py:83:

self = <_MultiThreadedRendezvous of RPC that terminated with:

status = StatusCode.INVALID_ARGUMENT

details = "The index Alb..._line":1066,"grpc_message":"The index AlbumsByAlbumTitle cannot be used because it is in backfill.","grpc_status":3}"


def __next__(self):


  return self._next()


.nox/py-3-8/lib/python3.8/site-packages/grpc/_channel.py:426:

self = <_MultiThreadedRendezvous of RPC that terminated with:

status = StatusCode.INVALID_ARGUMENT

details = "The index Alb..._line":1066,"grpc_message":"The index AlbumsByAlbumTitle cannot be used because it is in backfill.","grpc_status":3}"


def _next(self):
    with self._state.condition:
        if self._state.code is None:
            event_handler = _event_handler(self._state,
                                           self._response_deserializer)
            self._state.due.add(cygrpc.OperationType.receive_message)
            operating = self._call.operate(
                (cygrpc.ReceiveMessageOperation(_EMPTY_FLAGS),),
                event_handler)
            if not operating:
                self._state.due.remove(cygrpc.OperationType.receive_message)
        elif self._state.code is grpc.StatusCode.OK:
            raise StopIteration()
        else:
            raise self

        def _response_ready():
            return (self._state.response is not None or
                    (cygrpc.OperationType.receive_message
                     not in self._state.due and
                     self._state.code is not None))

        _common.wait(self._state.condition.wait, _response_ready)
        if self._state.response is not None:
            response = self._state.response
            self._state.response = None
            return response
        elif cygrpc.OperationType.receive_message not in self._state.due:
            if self._state.code is grpc.StatusCode.OK:
                raise StopIteration()
            elif self._state.code is not None:


              raise self


E                   grpc._channel._MultiThreadedRendezvous: <_MultiThreadedRendezvous of RPC that terminated with:

E                   	status = StatusCode.INVALID_ARGUMENT

E                   	details = "The index AlbumsByAlbumTitle cannot be used because it is in backfill."

E                   	debug_error_string = "{"created":"@1625830260.472572240","description":"Error received from peer ipv4:74.125.142.95:443","file":"src/core/lib/surface/call.cc","file_line":1066,"grpc_message":"The index AlbumsByAlbumTitle cannot be used because it is in backfill.","grpc_status":3}"

E                   >
.nox/py-3-8/lib/python3.8/site-packages/grpc/_channel.py:826: _MultiThreadedRendezvous
The above exception was the direct cause of the following exception:
capsys = <_pytest.capture.CaptureFixture object at 0x7f9e201b7370>
def test_query_data_with_index(capsys):


  snippets.query_data_with_index(INSTANCE_ID, DATABASE_ID)


snippets_test.py:146:

snippets.py:356: in query_data_with_index

for row in results:

../../google/cloud/spanner_v1/streamed.py:149: in iter

self._consume_next()

../../google/cloud/spanner_v1/streamed.py:121: in _consume_next

response = six.next(self._response_iterator)

../../google/cloud/spanner_v1/snapshot.py:59: in _restart_on_unavailable

iterator = method(request=request)

../../google/cloud/spanner_v1/services/spanner/client.py:884: in execute_streaming_sql

response = rpc(request, retry=retry, timeout=timeout, metadata=metadata,)

.nox/py-3-8/lib/python3.8/site-packages/google/api_core/gapic_v1/method.py:145: in call

return wrapped_func(*args, **kwargs)

.nox/py-3-8/lib/python3.8/site-packages/google/api_core/timeout.py:102: in func_with_timeout

return func(*args, **kwargs)

.nox/py-3-8/lib/python3.8/site-packages/google/api_core/grpc_helpers.py:162: in error_remapped_callable

six.raise_from(exceptions.from_grpc_error(exc), exc)

value = None

from_value = <_MultiThreadedRendezvous of RPC that terminated with:

status = StatusCode.INVALID_ARGUMENT

details = "The index Alb..._line":1066,"grpc_message":"The index AlbumsByAlbumTitle cannot be used because it is in backfill.","grpc_status":3}"



???

E   google.api_core.exceptions.InvalidArgument: 400 The index AlbumsByAlbumTitle cannot be used because it is in backfill.

:3: InvalidArgument