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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.hbase.wal;
import java.io.Closeable;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.List;
import java.util.regex.Pattern;
import com.google.common.annotations.VisibleForTesting;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.util.FSUtils;
// 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.regionserver.wal.WALActionsListener;
/**
* A WAL Provider that returns a single thread safe WAL that writes to HDFS.
* By default, this implementation picks a directory in HDFS based on a combination of
*
* - the HBase root directory
*
- HConstants.HREGION_LOGDIR_NAME
*
- the given factory's factoryId (usually identifying the regionserver by host:port)
*
* It also uses the providerId to diffentiate among files.
*
*/
@InterfaceAudience.Private
@InterfaceStability.Evolving
public class DefaultWALProvider implements WALProvider {
private static final Log LOG = LogFactory.getLog(DefaultWALProvider.class);
// Only public so classes back in regionserver.wal can access
public interface Reader extends WAL.Reader {
/**
* @param fs File system.
* @param path Path.
* @param c Configuration.
* @param s Input stream that may have been pre-opened by the caller; may be null.
*/
void init(FileSystem fs, Path path, Configuration c, FSDataInputStream s) throws IOException;
}
// 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;
}
private FSHLog log = null;
/**
* @param factory factory that made us, identity used for FS layout. may not be null
* @param conf may not be null
* @param listeners may be null
* @param providerId differentiate between providers from one facotry, used for FS layout. may be
* null
*/
@Override
public void init(final WALFactory factory, final Configuration conf,
final List listeners, String providerId) throws IOException {
if (null != log) {
throw new IllegalStateException("WALProvider.init should only be called once.");
}
if (null == providerId) {
providerId = DEFAULT_PROVIDER_ID;
}
final String logPrefix = factory.factoryId + WAL_FILE_NAME_DELIMITER + providerId;
log = 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
public WAL getWAL(final byte[] identifier) throws IOException {
return log;
}
@Override
public void close() throws IOException {
log.close();
}
@Override
public void shutdown() throws IOException {
log.shutdown();
}
// should be package private; more visible for use in FSHLog
public static final String WAL_FILE_NAME_DELIMITER = ".";
/** The hbase:meta region's WAL filename extension */
@VisibleForTesting
public static final String META_WAL_PROVIDER_ID = ".meta";
static final String DEFAULT_PROVIDER_ID = "default";
// Implementation details that currently leak in tests or elsewhere follow
/** File Extension used while splitting an WAL into regions (HBASE-2312) */
public static final String SPLITTING_EXT = "-splitting";
/**
* iff the given WALFactory is using the DefaultWALProvider for meta and/or non-meta,
* count the number of files (rolled and active). if either of them aren't, count 0
* for that provider.
* @param walFactory may not be null.
*/
public static long getNumLogFiles(WALFactory walFactory) {
long result = 0;
if (walFactory.provider instanceof DefaultWALProvider) {
result += ((FSHLog)((DefaultWALProvider)walFactory.provider).log).getNumLogFiles();
}
WALProvider meta = walFactory.metaProvider.get();
if (meta instanceof DefaultWALProvider) {
result += ((FSHLog)((DefaultWALProvider)meta).log).getNumLogFiles();
}
return result;
}
/**
* iff the given WALFactory is using the DefaultWALProvider for meta and/or non-meta,
* count the size of files (rolled and active). if either of them aren't, count 0
* for that provider.
* @param walFactory may not be null.
*/
public static long getLogFileSize(WALFactory walFactory) {
long result = 0;
if (walFactory.provider instanceof DefaultWALProvider) {
result += ((FSHLog)((DefaultWALProvider)walFactory.provider).log).getLogFileSize();
}
WALProvider meta = walFactory.metaProvider.get();
if (meta instanceof DefaultWALProvider) {
result += ((FSHLog)((DefaultWALProvider)meta).log).getLogFileSize();
}
return result;
}
/**
* returns the number of rolled WAL files.
*/
@VisibleForTesting
public static int getNumRolledLogFiles(WAL wal) {
return ((FSHLog)wal).getNumRolledLogFiles();
}
/**
* return the current filename from the current wal.
*/
@VisibleForTesting
public static Path getCurrentFileName(final WAL wal) {
return ((FSHLog)wal).getCurrentFileName();
}
/**
* request a log roll, but don't actually do it.
*/
@VisibleForTesting
static void requestLogRoll(final WAL wal) {
((FSHLog)wal).requestLogRoll();
}
/**
* It returns the file create timestamp from the file name.
* For name format see {@link #validateWALFilename(String)}
* public until remaining tests move to o.a.h.h.wal
* @param wal must not be null
* @return the file number that is part of the WAL file name
*/
@VisibleForTesting
public static long extractFileNumFromWAL(final WAL wal) {
final Path walName = ((FSHLog)wal).getCurrentFileName();
if (walName == null) {
throw new IllegalArgumentException("The WAL path couldn't be null");
}
final String[] walPathStrs = walName.toString().split("\\" + WAL_FILE_NAME_DELIMITER);
return Long.parseLong(walPathStrs[walPathStrs.length - (isMetaFile(walName) ? 2:1)]);
}
/**
* Pattern used to validate a WAL file name
* see {@link #validateWALFilename(String)} for description.
*/
private static final Pattern pattern = Pattern.compile(".*\\.\\d*("+META_WAL_PROVIDER_ID+")*");
/**
* A WAL file name is of the format:
* <wal-name>{@link #WAL_FILE_NAME_DELIMITER}<file-creation-timestamp>[.meta].
*
* provider-name is usually made up of a server-name and a provider-id
*
* @param filename name of the file to validate
* @return true if the filename matches an WAL, false
* otherwise
*/
public static boolean validateWALFilename(String filename) {
return pattern.matcher(filename).matches();
}
/**
* Construct the directory name for all WALs on a given server.
*
* @param serverName
* Server name formatted as described in {@link ServerName}
* @return the relative WAL directory name, e.g.
* .logs/1.example.org,60030,12345 if
* serverName passed is
* 1.example.org,60030,12345
*/
public static String getWALDirectoryName(final String serverName) {
StringBuilder dirName = new StringBuilder(HConstants.HREGION_LOGDIR_NAME);
dirName.append("/");
dirName.append(serverName);
return dirName.toString();
}
/**
* Pulls a ServerName out of a Path generated according to our layout rules.
*
* In the below layouts, this method ignores the format of the logfile component.
*
* Current format:
*
* [base directory for hbase]/hbase/.logs/ServerName/logfile
* or
* [base directory for hbase]/hbase/.logs/ServerName-splitting/logfile
*
* Expected to work for individual log files and server-specific directories.
*
* @return null if it's not a log file. Returns the ServerName of the region
* server that created this log file otherwise.
*/
public static ServerName getServerNameFromWALDirectoryName(Configuration conf, String path)
throws IOException {
if (path == null
|| path.length() <= HConstants.HREGION_LOGDIR_NAME.length()) {
return null;
}
if (conf == null) {
throw new IllegalArgumentException("parameter conf must be set");
}
final String rootDir = conf.get(HConstants.HBASE_DIR);
if (rootDir == null || rootDir.isEmpty()) {
throw new IllegalArgumentException(HConstants.HBASE_DIR
+ " key not found in conf.");
}
final StringBuilder startPathSB = new StringBuilder(rootDir);
if (!rootDir.endsWith("/"))
startPathSB.append('/');
startPathSB.append(HConstants.HREGION_LOGDIR_NAME);
if (!HConstants.HREGION_LOGDIR_NAME.endsWith("/"))
startPathSB.append('/');
final String startPath = startPathSB.toString();
String fullPath;
try {
fullPath = FileSystem.get(conf).makeQualified(new Path(path)).toString();
} catch (IllegalArgumentException e) {
LOG.info("Call to makeQualified failed on " + path + " " + e.getMessage());
return null;
}
if (!fullPath.startsWith(startPath)) {
return null;
}
final String serverNameAndFile = fullPath.substring(startPath.length());
if (serverNameAndFile.indexOf('/') < "a,0,0".length()) {
// Either it's a file (not a directory) or it's not a ServerName format
return null;
}
Path p = new Path(path);
return getServerNameFromWALDirectoryName(p);
}
/**
* This function returns region server name from a log file name which is in one of the following
* formats:
*
* - hdfs://
/hbase/.logs/-splitting/...
* - hdfs://
/hbase/.logs//...
*
* @param logFile
* @return null if the passed in logFile isn't a valid WAL file path
*/
public static ServerName getServerNameFromWALDirectoryName(Path logFile) {
String logDirName = logFile.getParent().getName();
// We were passed the directory and not a file in it.
if (logDirName.equals(HConstants.HREGION_LOGDIR_NAME)) {
logDirName = logFile.getName();
}
ServerName serverName = null;
if (logDirName.endsWith(SPLITTING_EXT)) {
logDirName = logDirName.substring(0, logDirName.length() - SPLITTING_EXT.length());
}
try {
serverName = ServerName.parseServerName(logDirName);
} catch (IllegalArgumentException ex) {
serverName = null;
LOG.warn("Cannot parse a server name from path=" + logFile + "; " + ex.getMessage());
}
if (serverName != null && serverName.getStartcode() < 0) {
LOG.warn("Invalid log file path=" + logFile);
serverName = null;
}
return serverName;
}
public static boolean isMetaFile(Path p) {
return isMetaFile(p.getName());
}
public static boolean isMetaFile(String p) {
if (p != null && p.endsWith(META_WAL_PROVIDER_ID)) {
return true;
}
return false;
}
/**
* 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 logWriterClass = conf.getClass("hbase.regionserver.hlog.writer.impl",
ProtobufLogWriter.class, Writer.class);
try {
Writer writer = logWriterClass.newInstance();
writer.init(fs, path, conf, overwritable);
return writer;
} catch (Exception e) {
LOG.debug("Error instantiating log writer.", e);
throw new IOException("cannot get log writer", e);
}
}
}