| /** |
| * 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.hbase.io; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.hbase.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hbase.HConstants; |
| import org.apache.hadoop.hbase.util.FSUtils; |
| |
| /** |
| * WALLink describes a link to a WAL. |
| * |
| * An wal can be in /hbase/.logs/<server>/<wal> |
| * or it can be in /hbase/.oldlogs/<wal> |
| * |
| * The link checks first in the original path, |
| * if it is not present it fallbacks to the archived path. |
| */ |
| @InterfaceAudience.Private |
| public class WALLink extends FileLink { |
| /** |
| * @param conf {@link Configuration} from which to extract specific archive locations |
| * @param serverName Region Server owner of the log |
| * @param logName WAL file name |
| * @throws IOException on unexpected error. |
| */ |
| public WALLink(final Configuration conf, |
| final String serverName, final String logName) throws IOException { |
| this(FSUtils.getWALRootDir(conf), serverName, logName); |
| } |
| |
| /** |
| * @param walRootDir Path to the root directory where hbase files are stored |
| * @param serverName Region Server owner of the log |
| * @param logName WAL file name |
| */ |
| public WALLink(final Path walRootDir, final String serverName, final String logName) { |
| final Path oldLogDir = new Path(walRootDir, HConstants.HREGION_OLDLOGDIR_NAME); |
| final Path logDir = new Path(new Path(walRootDir, HConstants.HREGION_LOGDIR_NAME), serverName); |
| setLocations(new Path(logDir, logName), new Path(oldLogDir, logName)); |
| } |
| |
| /** |
| * @param originPath Path to the wal in the log directory |
| * @param archivePath Path to the wal in the archived log directory |
| */ |
| public WALLink(final Path originPath, final Path archivePath) { |
| setLocations(originPath, archivePath); |
| } |
| } |