| /** |
| * |
| * 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.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hbase.regionserver.wal.FSHLog; |
| import org.apache.hadoop.hbase.regionserver.wal.ProtobufLogWriter; |
| import org.apache.hadoop.hbase.regionserver.wal.WALUtil; |
| import org.apache.hadoop.hbase.util.CommonFSUtils; |
| import org.apache.hadoop.hbase.util.CommonFSUtils.StreamLacksCapabilityException; |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.apache.yetus.audience.InterfaceStability; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A WAL provider that use {@link FSHLog}. |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Evolving |
| public class FSHLogProvider extends AbstractFSWALProvider<FSHLog> { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(FSHLogProvider.class); |
| |
| // Only public so classes back in regionserver.wal can access |
| public interface Writer extends WALProvider.Writer { |
| /** |
| * @throws IOException if something goes wrong initializing an output stream |
| * @throws StreamLacksCapabilityException if the given FileSystem can't provide streams that |
| * meet the needs of the given Writer implementation. |
| */ |
| void init(FileSystem fs, Path path, Configuration c, boolean overwritable, long blocksize) |
| throws IOException, CommonFSUtils.StreamLacksCapabilityException; |
| } |
| |
| /** |
| * Public because of FSHLog. Should be package-private |
| * @param overwritable if the created writer can overwrite. For recovered edits, it is true and |
| * for WAL it is false. Thus we can distinguish WAL and recovered edits by this. |
| */ |
| public static Writer createWriter(final Configuration conf, final FileSystem fs, final Path path, |
| final boolean overwritable) throws IOException { |
| return createWriter(conf, fs, path, overwritable, |
| WALUtil.getWALBlockSize(conf, fs, path, overwritable)); |
| } |
| |
| /** |
| * Public because of FSHLog. Should be package-private |
| */ |
| public static Writer createWriter(final Configuration conf, final FileSystem fs, final Path path, |
| final boolean overwritable, long blocksize) 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.getDeclaredConstructor().newInstance(); |
| FileSystem rootFs = FileSystem.get(path.toUri(), conf); |
| writer.init(rootFs, path, conf, overwritable, blocksize); |
| return writer; |
| } catch (Exception e) { |
| if (e instanceof CommonFSUtils.StreamLacksCapabilityException) { |
| LOG.error("The RegionServer write ahead log provider for FileSystem implementations " + |
| "relies on the ability to call " + e.getMessage() + " for proper operation during " + |
| "component failures, but the current FileSystem does not support doing so. Please " + |
| "check the config value of '" + CommonFSUtils.HBASE_WAL_DIR + "' and ensure " + |
| "it points to a FileSystem mount that has suitable capabilities for output streams."); |
| } else { |
| 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(CommonFSUtils.getWALFileSystem(conf), CommonFSUtils.getWALRootDir(conf), |
| getWALDirectoryName(factory.factoryId), |
| getWALArchiveDirectoryName(conf, factory.factoryId), conf, listeners, true, logPrefix, |
| META_WAL_PROVIDER_ID.equals(providerId) ? META_WAL_PROVIDER_ID : null); |
| } |
| |
| @Override |
| protected void doInit(Configuration conf) throws IOException { |
| } |
| } |