/**
* Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
*
* 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.
*/
package com.linkedin.pinot.transport.common;
/**
* Determines at what level the selection for nodes (replica) has to happen
*/
public enum ReplicaSelectionGranularity {
/**
* For each segmentId in the request, the replica-selection policy is applied to get the node.
* If the selection policy is random or round-robin, then this granularity would likely increase
* the fan-out of the scatter request since there is a greater chance all replicas will be queried
**/
SEGMENT_ID,
/**
* For each segmentId-group in the request, the replica-selection policy is applied to get the node.
* This will likely reduce the fan-out as all segmentIds in the segmentId group goes to the same service.
* This is assuming the services hosting each segmentId-groups are disjoint.
**/
SEGMENT_ID_SET
}