backup.datanode.ipc.DataNodeBackupRPC.java Source code

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Here is the source code for backup.datanode.ipc.DataNodeBackupRPC.java

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/*
 * Copyright 2016 Fortitude Technologies LLC
 * 
 * Licensed 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 backup.datanode.ipc;

import static backup.BackupConstants.DFS_BACKUP_DATANODE_RPC_PORT_DEFAULT;
import static backup.BackupConstants.DFS_BACKUP_DATANODE_RPC_PORT_KEY;

import java.io.IOException;
import java.net.InetSocketAddress;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.ipc.ProtocolInfo;
import org.apache.hadoop.ipc.RPC;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.security.KerberosInfo;
import org.apache.hadoop.security.UserGroupInformation;

@KerberosInfo(serverPrincipal = DFSConfigKeys.DFS_DATANODE_KERBEROS_PRINCIPAL_KEY)
@ProtocolInfo(protocolName = "backup.datanode.ipc.DataNodeBackupRPC", protocolVersion = 1)
public interface DataNodeBackupRPC {

    public static DataNodeBackupRPC getDataNodeBackupRPC(DatanodeInfo datanodeInfo, Configuration conf,
            UserGroupInformation ugi) throws IOException, InterruptedException {
        String ipcHostname = datanodeInfo.getHostName();
        int ipcPort = datanodeInfo.getIpcPort();
        InetSocketAddress dataNodeIPCAddress = new InetSocketAddress(ipcHostname, ipcPort);
        return getDataNodeBackupRPC(dataNodeIPCAddress, conf, ugi);
    }

    public static DataNodeBackupRPC getDataNodeBackupRPC(InetSocketAddress dataNodeIPCAddress, Configuration conf,
            UserGroupInformation ugi) throws IOException, InterruptedException {
        int port = conf.getInt(DFS_BACKUP_DATANODE_RPC_PORT_KEY, DFS_BACKUP_DATANODE_RPC_PORT_DEFAULT);
        if (port == 0) {
            port = dataNodeIPCAddress.getPort() + 1;
        }
        InetSocketAddress dataNodeAddress = new InetSocketAddress(dataNodeIPCAddress.getAddress(), port);
        return RPC.getProtocolProxy(DataNodeBackupRPC.class, RPC.getProtocolVersion(DataNodeBackupRPC.class),
                dataNodeAddress, ugi, conf, NetUtils.getDefaultSocketFactory(conf)).getProxy();
    }

    /**
     * Backup a single block. This is a blocking call.
     * 
     * @param poolId
     * @param blockId
     * @param length
     * @param generationStamp
     * @throws IOException
     */
    void backupBlock(String poolId, long blockId, long length, long generationStamp) throws IOException;

    /**
     * Restores a single block. This is a blocking call.
     * 
     * @param poolId
     * @param blockId
     * @param length
     * @param generationStamp
     * @return
     * @throws IOException
     */
    boolean restoreBlock(String poolId, long blockId, long length, long generationStamp) throws IOException;

    /**
     * Get backup stats.
     * 
     * @return
     * @throws IOException
     */
    BackupStats getBackupStats() throws IOException;

    /**
     * Get restore stats.
     * 
     * @return
     * @throws IOException
     */
    RestoreStats getRestoreStats() throws IOException;

}