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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.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;
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 Hadoop FS.
* By default, this implementation picks a directory in Hadoop FS based on a combination of
*
* - the HBase root WAL 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;
}
protected volatile FSHLog log = null;
private WALFactory factory = null;
private Configuration conf = null;
private List listeners = null;
private String providerId = null;
private AtomicBoolean initialized = new AtomicBoolean(false);
// for default wal provider, logPrefix won't change
private String logPrefix = null;
/**
* we synchronized on walCreateLock to prevent wal recreation in different threads
*/
private final Object walCreateLock = new Object();
/**
* @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 (!initialized.compareAndSet(false, true)) {
throw new IllegalStateException("WALProvider.init should only be called once.");
}
this.factory = factory;
this.conf = conf;
this.listeners = listeners;
this.providerId = providerId;
// get log prefix
StringBuilder sb = new StringBuilder().append(factory.factoryId);
if (providerId != null) {
if (providerId.startsWith(WAL_FILE_NAME_DELIMITER)) {
sb.append(providerId);
} else {
sb.append(WAL_FILE_NAME_DELIMITER).append(providerId);
}
}
logPrefix = sb.toString();
}
@Override
public List getWALs() throws IOException {
if (log == null) {
return Collections.emptyList();
}
List wals = new ArrayList();
wals.add(log);
return wals;
}
@Override
public WAL getWAL(final byte[] identifier, byte[] namespace) throws IOException {
if (log == null) {
// only lock when need to create wal, and need to lock since
// creating hlog on fs is time consuming
synchronized (walCreateLock) {
if (log == null) {
log = new FSHLog(FSUtils.getWALFileSystem(conf), FSUtils.getWALRootDir(conf),
getWALDirectoryName(factory.factoryId), HConstants.HREGION_OLDLOGDIR_NAME, conf,
listeners, true, logPrefix,
META_WAL_PROVIDER_ID.equals(providerId) ? META_WAL_PROVIDER_ID : null);
}
}
}
return log;
}
@Override
public void close() throws IOException {
if (log != null) log.close();
}
@Override
public void shutdown() throws IOException {
if (log != null) 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.
*/
@Override
public long getNumLogFiles() {
return log == null ? 0 : this.log.getNumLogFiles();
}
/**
* 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.
*/
@Override
public long getLogFileSize() {
return log == null ? 0 : this.log.getLogFileSize();
}
/**
* 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 walDir = FSUtils.getWALRootDir(conf).toString();
final StringBuilder startPathSB = new StringBuilder(walDir);
if (!walDir.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://<name node>/hbase/.logs/<server name>-splitting/...
* - hdfs://<name node>/hbase/.logs/<server name>/...
*
* @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);
Writer writer = null;
try {
writer = logWriterClass.getDeclaredConstructor().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);
}
}
/**
* Get prefix of the log from its name, assuming WAL name in format of
* log_prefix.filenumber.log_suffix @see {@link FSHLog#getCurrentFileName()}
* @param name Name of the WAL to parse
* @return prefix of the log
*/
public static String getWALPrefixFromWALName(String name) {
int endIndex = name.replaceAll(META_WAL_PROVIDER_ID, "").lastIndexOf(".");
return name.substring(0, endIndex);
}
}