hadoop SPSService 源码
haddop SPSService 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/sps/SPSService.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.sps;
import java.util.List;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.StoragePolicySatisfierMode;
/**
* An interface for SPSService, which exposes life cycle and processing APIs.
*/
@InterfaceAudience.Private
@InterfaceStability.Evolving
public interface SPSService {
/**
* Initializes the helper services.
*
* @param ctxt
* - context is an helper service to provide communication channel
* between NN and SPS
*/
void init(Context ctxt);
/**
* Starts the SPS service. Make sure to initialize the helper services before
* invoking this method.
*
* @param spsMode sps service mode
*/
void start(StoragePolicySatisfierMode spsMode);
/**
* Stops the SPS service gracefully. Timed wait to stop storage policy
* satisfier daemon threads.
*/
void stopGracefully();
/**
* Stops the SPS service.
*
* @param forceStop
* true represents to clear all the sps path's hint, false otherwise.
*/
void stop(boolean forceStop);
/**
* Check whether StoragePolicySatisfier is running.
*
* @return true if running
*/
boolean isRunning();
/**
* Adds the Item information(file etc) to processing queue.
*
* @param itemInfo
* file info object for which need to satisfy the policy
*/
void addFileToProcess(ItemInfo itemInfo, boolean scanCompleted);
/**
* Adds all the Item information(file etc) to processing queue.
*
* @param startPathId
* - directoryId/fileId, on which SPS was called.
* @param itemInfoList
* - list of item infos
* @param scanCompleted
* - whether the scanning of directory fully done with itemInfoList
*/
void addAllFilesToProcess(long startPathId, List<ItemInfo> itemInfoList,
boolean scanCompleted);
/**
* @return current processing queue size.
*/
int processingQueueSize();
/**
* @return the configuration.
*/
Configuration getConf();
/**
* Marks the scanning of directory if finished.
*
* @param spsPath
* - satisfier path id
*/
void markScanCompletedForPath(long spsPath);
/**
* Given node is reporting that it received a certain movement attempt
* finished block.
*
* @param dnInfo
* - reported datanode
* @param storageType
* - storage type
* @param block
* - block that is attempted to move
*/
void notifyStorageMovementAttemptFinishedBlk(DatanodeInfo dnInfo,
StorageType storageType, Block block);
}
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