?? datanodetonamenodeprotocol.java
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/** * 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.contrib.dlucene;import java.io.IOException;import org.apache.hadoop.ipc.VersionedProtocol;/** datanode to namenode protocol. */public interface DataNodeToNameNodeProtocol extends VersionedProtocol { /** The version of the protocol. */ long VERSION_ID = 1L; /** * Send a heartbeat message to the namenode. * * @param status The status of the datanode. * @param searchableIndexes The indexes on the datanode. * @param leases The leases owned by the datanode. * @return the indexes to replicate * @throws IOExceptiuon */ HeartbeatResponse heartbeat(DataNodeStatus status, IndexLocation[] searchableIndexes, Lease[] leases) throws IOException; /** * Get a lease to be the primary replica for a specific index. * * @param index The index requiring the lease. * @return the lease. * @throws LeaseException */ Lease getLease(IndexLocation index) throws IOException ; /** * Relinquish a lease. * * @param lease the lease. * @return was operation successful */ public boolean relinquishLease(Lease lease) throws IOException ;}
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