| /** |
| * |
| * 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.wal; |
| |
| import java.io.IOException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hbase.HConstants; |
| import org.apache.hadoop.hbase.classification.InterfaceAudience; |
| import org.apache.hadoop.hbase.classification.InterfaceStability; |
| // imports for things that haven't moved from regionserver.wal yet. |
| import org.apache.hadoop.hbase.regionserver.wal.FSHLog; |
| import org.apache.hadoop.hbase.regionserver.wal.ProtobufLogWriter; |
| import org.apache.hadoop.hbase.util.FSUtils; |
| |
| /** |
| * A WAL provider that use {@link FSHLog}. |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Evolving |
| public class FSHLogProvider extends AbstractFSWALProvider<FSHLog> { |
| |
| private static final Log LOG = LogFactory.getLog(FSHLogProvider.class); |
| |
| // Only public so classes back in regionserver.wal can access |
| public interface Writer extends WALProvider.Writer { |
| void init(FileSystem fs, Path path, Configuration c, boolean overwritable) throws IOException; |
| } |
| |
| /** |
| * public because of FSHLog. Should be package-private |
| */ |
| public static Writer createWriter(final Configuration conf, final FileSystem fs, final Path path, |
| final boolean overwritable) throws IOException { |
| // Configuration already does caching for the Class lookup. |
| Class<? extends Writer> logWriterClass = conf.getClass("hbase.regionserver.hlog.writer.impl", |
| ProtobufLogWriter.class, Writer.class); |
| Writer writer = null; |
| try { |
| writer = logWriterClass.newInstance(); |
| writer.init(fs, path, conf, overwritable); |
| return writer; |
| } catch (Exception e) { |
| LOG.debug("Error instantiating log writer.", e); |
| if (writer != null) { |
| try{ |
| writer.close(); |
| } catch(IOException ee){ |
| LOG.error("cannot close log writer", ee); |
| } |
| } |
| throw new IOException("cannot get log writer", e); |
| } |
| } |
| |
| @Override |
| protected FSHLog createWAL() throws IOException { |
| return new FSHLog(FileSystem.get(conf), FSUtils.getRootDir(conf), |
| getWALDirectoryName(factory.factoryId), HConstants.HREGION_OLDLOGDIR_NAME, conf, listeners, |
| true, logPrefix, META_WAL_PROVIDER_ID.equals(providerId) ? META_WAL_PROVIDER_ID : null); |
| } |
| |
| @Override |
| protected void doInit(Configuration conf) throws IOException { |
| } |
| } |