Creates a new snapshot in the specified cluster from the specified
        source table. The cluster and the table must be in the same instance.

        Note: This is a private alpha release of Cloud Bigtable snapshots. This
        feature is not currently available to most Cloud Bigtable customers. This
        feature might be changed in backward-incompatible ways and is not
        recommended for production use. It is not subject to any SLA or deprecation
        policy.

        Example:
            >>> from google.cloud import bigtable_admin_v2
            >>>
            >>> client = bigtable_admin_v2.BigtableTableAdminClient()
            >>>
            >>> name = client.table_path('[PROJECT]', '[INSTANCE]', '[TABLE]')
            >>>
            >>> # TODO: Initialize `cluster`:
            >>> cluster = ''
            >>>
            >>> # TODO: Initialize `snapshot_id`:
            >>> snapshot_id = ''
            >>>
            >>> # TODO: Initialize `description`:
            >>> description = ''
            >>>
            >>> response = client.snapshot_table(name, cluster, snapshot_id, description)
            >>>
            >>> def callback(operation_future):
            ...     # Handle result.
            ...     result = operation_future.result()
            >>>
            >>> response.add_done_callback(callback)
            >>>
            >>> # Handle metadata.
            >>> metadata = response.metadata()

        Args:
            name (str): The unique name of the table to have the snapshot taken. Values are of
                the form ``projects/<project>/instances/<instance>/tables/<table>``.
            cluster (str): The name of the cluster where the snapshot will be created in. Values
                are of the form
                ``projects/<project>/instances/<instance>/clusters/<cluster>``.
            snapshot_id (str): The ID by which the new snapshot should be referred to within the parent
                cluster, e.g., ``mysnapshot`` of the form:
                ``[_a-zA-Z0-9][-_.a-zA-Z0-9]*`` rather than
                ``projects/<project>/instances/<instance>/clusters/<cluster>/snapshots/mysnapshot``.
            description (str): Description of the snapshot.
            ttl (Union[dict, ~google.cloud.bigtable_admin_v2.types.Duration]): The amount of time that the new snapshot can stay active after it is
                created. Once 'ttl' expires, the snapshot will get deleted. The maximum
                amount of time a snapshot can stay active is 7 days. If 'ttl' is not
                specified, the default value of 24 hours will be used.

                If a dict is provided, it must be of the same form as the protobuf
                message :class:`~google.cloud.bigtable_admin_v2.types.Duration`
            retry (Optional[google.api_core.retry.Retry]):  A retry object used
                to retry requests. If ``None`` is specified, requests will not
                be retried.
            timeout (Optional[float]): The amount of time, in seconds, to wait
                for the request to complete. Note that if ``retry`` is
                specified, the timeout applies to each individual attempt.
            metadata (Optional[Sequence[Tuple[str, str]]]): Additional metadata
                that is provided to the method.

        Returns:
            A :class:`~google.cloud.bigtable_admin_v2.types._OperationFuture` instance.

        Raises:
            google.api_core.exceptions.GoogleAPICallError: If the request
                    failed for any reason.
            google.api_core.exceptions.RetryError: If the request failed due
                    to a retryable error and retry attempts failed.
            ValueError: If the parameters are invalid.

def snapshot_table(
        self,
        name,
        cluster,
        snapshot_id,
        description,
        ttl=None,
        retry=google.api_core.gapic_v1.method.DEFAULT,
        timeout=google.api_core.gapic_v1.method.DEFAULT,
        metadata=None,
    ):
        """
        Creates a new snapshot in the specified cluster from the specified
        source table. The cluster and the table must be in the same instance.

        Note: This is a private alpha release of Cloud Bigtable snapshots. This
        feature is not currently available to most Cloud Bigtable customers. This
        feature might be changed in backward-incompatible ways and is not
        recommended for production use. It is not subject to any SLA or deprecation
        policy.

        Example:
            >>> from google.cloud import bigtable_admin_v2
            >>>
            >>> client = bigtable_admin_v2.BigtableTableAdminClient()
            >>>
            >>> name = client.table_path('[PROJECT]', '[INSTANCE]', '[TABLE]')
            >>>
            >>> # TODO: Initialize `cluster`:
            >>> cluster = ''
            >>>
            >>> # TODO: Initialize `snapshot_id`:
            >>> snapshot_id = ''
            >>>
            >>> # TODO: Initialize `description`:
            >>> description = ''
            >>>
            >>> response = client.snapshot_table(name, cluster, snapshot_id, description)
            >>>
            >>> def callback(operation_future):
            ...     # Handle result.
            ...     result = operation_future.result()
            >>>
            >>> response.add_done_callback(callback)
            >>>
            >>> # Handle metadata.
            >>> metadata = response.metadata()

        Args:
            name (str): The unique name of the table to have the snapshot taken. Values are of
                the form ``projects/<project>/instances/<instance>/tables/<table>``.
            cluster (str): The name of the cluster where the snapshot will be created in. Values
                are of the form
                ``projects/<project>/instances/<instance>/clusters/<cluster>``.
            snapshot_id (str): The ID by which the new snapshot should be referred to within the parent
                cluster, e.g., ``mysnapshot`` of the form:
                ``[_a-zA-Z0-9][-_.a-zA-Z0-9]*`` rather than
                ``projects/<project>/instances/<instance>/clusters/<cluster>/snapshots/mysnapshot``.
            description (str): Description of the snapshot.
            ttl (Union[dict, ~google.cloud.bigtable_admin_v2.types.Duration]): The amount of time that the new snapshot can stay active after it is
                created. Once 'ttl' expires, the snapshot will get deleted. The maximum
                amount of time a snapshot can stay active is 7 days. If 'ttl' is not
                specified, the default value of 24 hours will be used.

                If a dict is provided, it must be of the same form as the protobuf
                message :class:`~google.cloud.bigtable_admin_v2.types.Duration`
            retry (Optional[google.api_core.retry.Retry]):  A retry object used
                to retry requests. If ``None`` is specified, requests will not
                be retried.
            timeout (Optional[float]): The amount of time, in seconds, to wait
                for the request to complete. Note that if ``retry`` is
                specified, the timeout applies to each individual attempt.
            metadata (Optional[Sequence[Tuple[str, str]]]): Additional metadata
                that is provided to the method.

        Returns:
            A :class:`~google.cloud.bigtable_admin_v2.types._OperationFuture` instance.

        Raises:
            google.api_core.exceptions.GoogleAPICallError: If the request
                    failed for any reason.
            google.api_core.exceptions.RetryError: If the request failed due
                    to a retryable error and retry attempts failed.
            ValueError: If the parameters are invalid.
        """
        # Wrap the transport method to add retry and timeout logic.
        if "snapshot_table" not in self._inner_api_calls:
            self._inner_api_calls[
                "snapshot_table"
            ] = google.api_core.gapic_v1.method.wrap_method(
                self.transport.snapshot_table,
                default_retry=self._method_configs["SnapshotTable"].retry,
                default_timeout=self._method_configs["SnapshotTable"].timeout,
                client_info=self._client_info,
            )

        request = bigtable_table_admin_pb2.SnapshotTableRequest(
            name=name,
            cluster=cluster,
            snapshot_id=snapshot_id,
            description=description,
            ttl=ttl,
        )
        if metadata is None:
            metadata = []
        metadata = list(metadata)
        try:
            routing_header = [("name", name)]
        except AttributeError:
            pass
        else:
            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
                routing_header
            )
            metadata.append(routing_metadata)

        operation = self._inner_api_calls["snapshot_table"](
            request, retry=retry, timeout=timeout, metadata=metadata
        )
        return google.api_core.operation.from_gapic(
            operation,
            self.transport._operations_client,
            table_pb2.Snapshot,
            metadata_type=bigtable_table_admin_pb2.SnapshotTableMetadata,
        )