hadoop Phase 源码
haddop Phase 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/startupprogress/Phase.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.namenode.startupprogress;
import org.apache.hadoop.classification.InterfaceAudience;
/**
* Indicates a particular phase of the namenode startup sequence. The phases
* are listed here in their execution order.
*/
@InterfaceAudience.Private
public enum Phase {
/**
* The namenode is loading the fsimage file into memory.
*/
LOADING_FSIMAGE("LoadingFsImage", "Loading fsimage"),
/**
* The namenode is loading the edits file and applying its operations to the
* in-memory metadata.
*/
LOADING_EDITS("LoadingEdits", "Loading edits"),
/**
* The namenode is saving a new checkpoint.
*/
SAVING_CHECKPOINT("SavingCheckpoint", "Saving checkpoint"),
/**
* The namenode has entered safemode, awaiting block reports from data nodes.
*/
SAFEMODE("SafeMode", "Safe mode");
private final String name, description;
/**
* Returns phase description.
*
* @return String description
*/
public String getDescription() {
return description;
}
/**
* Returns phase name.
*
* @return String phase name
*/
public String getName() {
return name;
}
/**
* Private constructor of enum.
*
* @param name String phase name
* @param description String phase description
*/
private Phase(String name, String description) {
this.name = name;
this.description = description;
}
}
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