hadoop FederationNamenodeServiceState 源码
haddop FederationNamenodeServiceState 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/resolver/FederationNamenodeServiceState.java
/**
* 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.server.federation.resolver;
import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
/**
* Namenode state in the federation. The order of this enum is used to evaluate
* NN priority for RPC calls.
*/
public enum FederationNamenodeServiceState {
ACTIVE, // HAServiceState.ACTIVE or operational.
OBSERVER, // HAServiceState.OBSERVER.
STANDBY, // HAServiceState.STANDBY.
UNAVAILABLE, // When the namenode cannot be reached.
EXPIRED, // When the last update is too old.
DISABLED; // When the nameservice is disabled.
public static FederationNamenodeServiceState getState(HAServiceState state) {
switch(state) {
case ACTIVE:
return FederationNamenodeServiceState.ACTIVE;
case OBSERVER:
return FederationNamenodeServiceState.OBSERVER;
case STANDBY:
return FederationNamenodeServiceState.STANDBY;
case INITIALIZING:
return FederationNamenodeServiceState.UNAVAILABLE;
case STOPPING:
return FederationNamenodeServiceState.UNAVAILABLE;
default:
return FederationNamenodeServiceState.UNAVAILABLE;
}
}
}
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