hadoop BalanceJournal 源码
haddop BalanceJournal 代码
文件路径：/hadoop-tools/hadoop-federation-balance/src/main/java/org/apache/hadoop/tools/fedbalance/procedure/BalanceJournal.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.tools.fedbalance.procedure;
import org.apache.hadoop.conf.Configurable;
import java.io.IOException;
/**
* The Journal of the state machine. It handles the job persistence and recover.
*/
public interface BalanceJournal extends Configurable {
/**
* Save journal of this job.
*/
void saveJob(BalanceJob job) throws IOException;
/**
* Recover the job from journal.
*/
void recoverJob(BalanceJob job) throws IOException;
/**
* List all unfinished jobs.
*/
BalanceJob[] listAllJobs() throws IOException;
/**
* Clear all the journals of this job.
*/
void clear(BalanceJob job) throws IOException;
}
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