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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.hadoop.hdfs.protocolPB;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.CommonConfigurationKeys;
import org.apache.hadoop.ipc.ProtocolInfo;
import org.apache.hadoop.security.KerberosInfo;
import org.apache.hadoop.hdfs.protocol.proto.ReconfigurationProtocolProtos.ReconfigurationProtocolService;

/**
 * Protocol that clients use to communicate with the NN/DN to do
 * reconfiguration on the fly.
 *
 * Note: This extends the protocolbuffer service based interface to
 * add annotations required for security.
 */
@KerberosInfo(serverPrincipal =
    CommonConfigurationKeys.HADOOP_SECURITY_SERVICE_USER_NAME_KEY)
@ProtocolInfo(
    protocolName = "org.apache.hadoop.hdfs.protocol.ReconfigurationProtocol",
    protocolVersion = 1)
@InterfaceAudience.Public
@InterfaceStability.Evolving
public interface ReconfigurationProtocolPB extends
    ReconfigurationProtocolService.BlockingInterface {
}