| /** |
| * 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.hdds.scm.protocol; |
| |
| import org.apache.hadoop.hdds.protocol.DatanodeDetails; |
| import org.apache.hadoop.hdds.scm.ScmConfigKeys; |
| import org.apache.hadoop.hdds.scm.container.common.helpers.ExcludeList; |
| import org.apache.hadoop.security.KerberosInfo; |
| import org.apache.hadoop.hdds.scm.ScmInfo; |
| import org.apache.hadoop.hdds.scm.container.common.helpers.AllocatedBlock; |
| import org.apache.hadoop.hdds.protocol.proto.HddsProtos.ReplicationFactor; |
| import org.apache.hadoop.hdds.protocol.proto.HddsProtos.ReplicationType; |
| import org.apache.hadoop.ozone.common.BlockGroup; |
| import org.apache.hadoop.ozone.common.DeleteBlockGroupResult; |
| |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.util.List; |
| |
| /** |
| * ScmBlockLocationProtocol is used by an HDFS node to find the set of nodes |
| * to read/write a block. |
| */ |
| @KerberosInfo(serverPrincipal = ScmConfigKeys.HDDS_SCM_KERBEROS_PRINCIPAL_KEY) |
| public interface ScmBlockLocationProtocol extends Closeable { |
| |
| @SuppressWarnings("checkstyle:ConstantName") |
| /** |
| * Version 1: Initial version. |
| */ |
| long versionID = 1L; |
| |
| /** |
| * Asks SCM where a block should be allocated. SCM responds with the |
| * set of datanodes that should be used creating this block. |
| * @param size - size of the block. |
| * @param numBlocks - number of blocks. |
| * @param type - replication type of the blocks. |
| * @param factor - replication factor of the blocks. |
| * @param excludeList List of datanodes/containers to exclude during block |
| * allocation. |
| * @return allocated block accessing info (key, pipeline). |
| * @throws IOException |
| */ |
| List<AllocatedBlock> allocateBlock(long size, int numBlocks, |
| ReplicationType type, ReplicationFactor factor, String owner, |
| ExcludeList excludeList) throws IOException; |
| |
| /** |
| * Delete blocks for a set of object keys. |
| * |
| * @param keyBlocksInfoList Map of object key and its blocks. |
| * @return list of block deletion results. |
| * @throws IOException if there is any failure. |
| */ |
| List<DeleteBlockGroupResult> |
| deleteKeyBlocks(List<BlockGroup> keyBlocksInfoList) throws IOException; |
| |
| /** |
| * Gets the Clusterid and SCM Id from SCM. |
| */ |
| ScmInfo getScmInfo() throws IOException; |
| |
| /** |
| * Sort datanodes with distance to client. |
| * @param nodes list of network name of each node. |
| * @param clientMachine client address, depends, can be hostname or ipaddress. |
| */ |
| List<DatanodeDetails> sortDatanodes(List<String> nodes, |
| String clientMachine) throws IOException; |
| } |