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Contents
/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright 2020-Present Couchbase, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
namespace couchbase
{
/**
* Select read preference (or affinity) for the replica APIs such as:
*
* * collection::get_all_replicas
* * collection::get_any_replica
* * collection::lookup_in_all_replicas
* * collection::lookup_in_any_replica
*
* @note all strategies except read_preference::no_preference, reduce number of the nodes
* that the SDK will use for replica read operations. In other words, it will
* increase likelihood of getting `errc::key_value::document_irretrievable`
* error code if the filtered set of the nodes is empty, or do not have any
* documents available.
*
* @see https://docs.couchbase.com/server/current/manage/manage-groups/manage-groups.html
*/
enum class read_preference {
/**
* Do not enforce any filtering for replica set.
*/
no_preference,
/**
* Exclude any nodes that do not belong to local group selected during
* cluster instantiation with network_options::preferred_server_group().
*/
selected_server_group,
/**
* The same as read_preference::selected_server_group, but if the filtered
* replica set is empty, expand it to all available nodes (fall back to
* read_preference::no_preference effectively).
*/
selected_server_group_or_all_available,
};
} // namespace couchbase
Version data entries
5 entries across 5 versions & 1 rubygems