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R3704/hadoop-2.3.0-src/hadoop-common-project/hadoop-common/src/main/proto/HAServiceProtocol.proto
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HAServiceProtocol.proto
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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.
*/
/**
* These .proto interfaces are private and stable.
* Please see http://wiki.apache.org/hadoop/Compatibility
* for what changes are allowed for a *stable* .proto interface.
*/
option java_package = "org.apache.hadoop.ha.proto";
option java_outer_classname = "HAServiceProtocolProtos";
option java_generic_services = true;
option java_generate_equals_and_hash = true;
package hadoop.common;
enum HAServiceStateProto {
INITIALIZING = 0;
ACTIVE = 1;
STANDBY = 2;
}
enum HARequestSource {
REQUEST_BY_USER = 0;
REQUEST_BY_USER_FORCED = 1;
REQUEST_BY_ZKFC = 2;
}
message HAStateChangeRequestInfoProto {
required HARequestSource reqSource = 1;
}
/**
* void request
*/
message MonitorHealthRequestProto {
}
/**
* void response
*/
message MonitorHealthResponseProto {
}
/**
* void request
*/
message TransitionToActiveRequestProto {
required HAStateChangeRequestInfoProto reqInfo = 1;
}
/**
* void response
*/
message TransitionToActiveResponseProto {
}
/**
* void request
*/
message TransitionToStandbyRequestProto {
required HAStateChangeRequestInfoProto reqInfo = 1;
}
/**
* void response
*/
message TransitionToStandbyResponseProto {
}
/**
* void request
*/
message GetServiceStatusRequestProto {
}
/**
* Returns the state of the service
*/
message GetServiceStatusResponseProto {
required HAServiceStateProto state = 1;
// If state is STANDBY, indicate whether it is
// ready to become active.
optional bool readyToBecomeActive = 2;
// If not ready to become active, a textual explanation of why not
optional string notReadyReason = 3;
}
/**
* Protocol interface provides High availability related
* primitives to monitor and failover a service.
*
* For details see o.a.h.ha.HAServiceProtocol.
*/
service HAServiceProtocolService {
/**
* Monitor the health of a service.
*/
rpc monitorHealth(MonitorHealthRequestProto)
returns(MonitorHealthResponseProto);
/**
* Request service to tranisition to active state.
*/
rpc transitionToActive(TransitionToActiveRequestProto)
returns(TransitionToActiveResponseProto);
/**
* Request service to transition to standby state.
*/
rpc transitionToStandby(TransitionToStandbyRequestProto)
returns(TransitionToStandbyResponseProto);
/**
* Get the current status of the service.
*/
rpc getServiceStatus(GetServiceStatusRequestProto)
returns(GetServiceStatusResponseProto);
}
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