/**
*
* 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.regionserver;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HDFSBlocksDistribution;
import org.apache.hadoop.hbase.io.FSDataInputStreamWrapper;
import org.apache.hadoop.hbase.io.HFileLink;
import org.apache.hadoop.hbase.io.HalfStoreFileReader;
import org.apache.hadoop.hbase.io.Reference;
import org.apache.hadoop.hbase.io.encoding.DataBlockEncoding;
import org.apache.hadoop.hbase.io.hfile.CacheConfig;
import org.apache.hadoop.hbase.util.FSUtils;
/**
* Describe a StoreFile (hfile, reference, link)
*/
@InterfaceAudience.Private
public class StoreFileInfo {
public static final Log LOG = LogFactory.getLog(StoreFileInfo.class);
/**
* A non-capture group, for hfiles, so that this can be embedded.
* HFiles are uuid ([0-9a-z]+). Bulk loaded hfiles has (_SeqId_[0-9]+_) has suffix.
*/
public static final String HFILE_NAME_REGEX = "[0-9a-f]+(?:_SeqId_[0-9]+_)?";
/** Regex that will work for hfiles */
private static final Pattern HFILE_NAME_PATTERN =
Pattern.compile("^(" + HFILE_NAME_REGEX + ")");
/**
* Regex that will work for straight reference names (<hfile>.<parentEncRegion>)
* and hfilelink reference names (<table>=<region>-<hfile>.<parentEncRegion>)
* If reference, then the regex has more than just one group.
* Group 1, hfile/hfilelink pattern, is this file's id.
* Group 2 '(.+)' is the reference's parent region name.
*/
private static final Pattern REF_NAME_PATTERN =
Pattern.compile(String.format("^(%s|%s)\\.(.+)$",
HFILE_NAME_REGEX, HFileLink.LINK_NAME_REGEX));
// HDFS blocks distribution information
private HDFSBlocksDistribution hdfsBlocksDistribution = null;
// If this storefile references another, this is the reference instance.
private final Reference reference;
// If this storefile is a link to another, this is the link instance.
private final HFileLink link;
// FileSystem information for the file.
private final FileStatus fileStatus;
/**
* Create a Store File Info
* @param conf the {@link Configuration} to use
* @param fs The current file system to use.
* @param path The {@link Path} of the file
*/
public StoreFileInfo(final Configuration conf, final FileSystem fs, final Path path)
throws IOException {
this(conf, fs, fs.getFileStatus(path));
}
/**
* Create a Store File Info
* @param conf the {@link Configuration} to use
* @param fs The current file system to use.
* @param fileStatus The {@link FileStatus} of the file
*/
public StoreFileInfo(final Configuration conf, final FileSystem fs, final FileStatus fileStatus)
throws IOException {
this.fileStatus = fileStatus;
Path p = fileStatus.getPath();
if (HFileLink.isHFileLink(p)) {
// HFileLink
this.reference = null;
this.link = new HFileLink(conf, p);
if (LOG.isTraceEnabled()) LOG.trace(p + " is a link");
} else if (isReference(p)) {
this.reference = Reference.read(fs, p);
Path referencePath = getReferredToFile(p);
if (HFileLink.isHFileLink(referencePath)) {
// HFileLink Reference
this.link = new HFileLink(conf, referencePath);
} else {
// Reference
this.link = null;
}
if (LOG.isTraceEnabled()) LOG.trace(p + " is a " + reference.getFileRegion() +
" reference to " + referencePath);
} else if (isHFile(p)) {
// HFile
this.reference = null;
this.link = null;
} else {
throw new IOException("path=" + p + " doesn't look like a valid StoreFile");
}
}
/*
* @return the Reference object associated to this StoreFileInfo.
* null if the StoreFile is not a reference.
*/
Reference getReference() {
return this.reference;
}
/** @return True if the store file is a Reference */
public boolean isReference() {
return this.reference != null;
}
/** @return True if the store file is a top Reference */
public boolean isTopReference() {
return this.reference != null && Reference.isTopFileRegion(this.reference.getFileRegion());
}
/** @return True if the store file is a link */
public boolean isLink() {
return this.link != null && this.reference == null;
}
/** @return the HDFS block distribution */
public HDFSBlocksDistribution getHDFSBlockDistribution() {
return this.hdfsBlocksDistribution;
}
/**
* Open a Reader for the StoreFile
* @param fs The current file system to use.
* @param cacheConf The cache configuration and block cache reference.
* @return The StoreFile.Reader for the file
*/
public StoreFile.Reader open(final FileSystem fs,
final CacheConfig cacheConf) throws IOException {
FSDataInputStreamWrapper in;
FileStatus status;
if (this.link != null) {
// HFileLink
in = new FSDataInputStreamWrapper(fs, this.link);
status = this.link.getFileStatus(fs);
} else if (this.reference != null) {
// HFile Reference
Path referencePath = getReferredToFile(this.getPath());
in = new FSDataInputStreamWrapper(fs, referencePath);
status = fs.getFileStatus(referencePath);
} else {
in = new FSDataInputStreamWrapper(fs, this.getPath());
status = fileStatus;
}
long length = status.getLen();
if (this.reference != null) {
hdfsBlocksDistribution = computeRefFileHDFSBlockDistribution(fs, reference, status);
return new HalfStoreFileReader(
fs, this.getPath(), in, length, cacheConf, reference);
} else {
hdfsBlocksDistribution = FSUtils.computeHDFSBlocksDistribution(fs, status, 0, length);
return new StoreFile.Reader(fs, this.getPath(), in, length, cacheConf);
}
}
/**
* Compute the HDFS Block Distribution for this StoreFile
*/
public HDFSBlocksDistribution computeHDFSBlocksDistribution(final FileSystem fs)
throws IOException {
FileStatus status;
if (this.reference != null) {
if (this.link != null) {
// HFileLink Reference
status = link.getFileStatus(fs);
} else {
// HFile Reference
Path referencePath = getReferredToFile(this.getPath());
status = fs.getFileStatus(referencePath);
}
return computeRefFileHDFSBlockDistribution(fs, reference, status);
} else {
if (this.link != null) {
// HFileLink
status = link.getFileStatus(fs);
} else {
status = this.fileStatus;
}
return FSUtils.computeHDFSBlocksDistribution(fs, status, 0, status.getLen());
}
}
/** @return The {@link Path} of the file */
public Path getPath() {
return this.fileStatus.getPath();
}
/** @return The {@link FileStatus} of the file */
public FileStatus getFileStatus() {
return this.fileStatus;
}
/** @return Get the modification time of the file. */
public long getModificationTime() {
return this.fileStatus.getModificationTime();
}
@Override
public String toString() {
return this.getPath() +
(isReference() ? "-" + getReferredToFile(this.getPath()) + "-" + reference : "");
}
/**
* @param path Path to check.
* @return True if the path has format of a HFile.
*/
public static boolean isHFile(final Path path) {
return isHFile(path.getName());
}
public static boolean isHFile(final String fileName) {
Matcher m = HFILE_NAME_PATTERN.matcher(fileName);
return m.matches() && m.groupCount() > 0;
}
/**
* @param path Path to check.
* @return True if the path has format of a HStoreFile reference.
*/
public static boolean isReference(final Path path) {
return isReference(path.getName());
}
/**
* @param name file name to check.
* @return True if the path has format of a HStoreFile reference.
*/
public static boolean isReference(final String name) {
Matcher m = REF_NAME_PATTERN.matcher(name);
return m.matches() && m.groupCount() > 1;
}
/*
* Return path to the file referred to by a Reference. Presumes a directory
* hierarchy of <code>${hbase.rootdir}/data/${namespace}/tablename/regionname/familyname</code>.
* @param p Path to a Reference file.
* @return Calculated path to parent region file.
* @throws IllegalArgumentException when path regex fails to match.
*/
public static Path getReferredToFile(final Path p) {
Matcher m = REF_NAME_PATTERN.matcher(p.getName());
if (m == null || !m.matches()) {
LOG.warn("Failed match of store file name " + p.toString());
throw new IllegalArgumentException("Failed match of store file name " +
p.toString());
}
// Other region name is suffix on the passed Reference file name
String otherRegion = m.group(2);
// Tabledir is up two directories from where Reference was written.
Path tableDir = p.getParent().getParent().getParent();
String nameStrippedOfSuffix = m.group(1);
LOG.debug("reference '" + p + "' to region=" + otherRegion + " hfile=" + nameStrippedOfSuffix);
// Build up new path with the referenced region in place of our current
// region in the reference path. Also strip regionname suffix from name.
return new Path(new Path(new Path(tableDir, otherRegion),
p.getParent().getName()), nameStrippedOfSuffix);
}
/**
* Validate the store file name.
* @param fileName name of the file to validate
* @return <tt>true</tt> if the file could be a valid store file, <tt>false</tt> otherwise
*/
public static boolean validateStoreFileName(final String fileName) {
if (HFileLink.isHFileLink(fileName) || isReference(fileName))
return(true);
return !fileName.contains("-");
}
/**
* Return if the specified file is a valid store file or not.
* @param fileStatus The {@link FileStatus} of the file
* @return <tt>true</tt> if the file is valid
*/
public static boolean isValid(final FileStatus fileStatus)
throws IOException {
final Path p = fileStatus.getPath();
if (fileStatus.isDir())
return false;
// Check for empty hfile. Should never be the case but can happen
// after data loss in hdfs for whatever reason (upgrade, etc.): HBASE-646
// NOTE: that the HFileLink is just a name, so it's an empty file.
if (!HFileLink.isHFileLink(p) && fileStatus.getLen() <= 0) {
LOG.warn("Skipping " + p + " beccreateStoreDirause its empty. HBASE-646 DATA LOSS?");
return false;
}
return validateStoreFileName(p.getName());
}
/**
* helper function to compute HDFS blocks distribution of a given reference
* file.For reference file, we don't compute the exact value. We use some
* estimate instead given it might be good enough. we assume bottom part
* takes the first half of reference file, top part takes the second half
* of the reference file. This is just estimate, given
* midkey ofregion != midkey of HFile, also the number and size of keys vary.
* If this estimate isn't good enough, we can improve it later.
* @param fs The FileSystem
* @param reference The reference
* @param status The reference FileStatus
* @return HDFS blocks distribution
*/
private static HDFSBlocksDistribution computeRefFileHDFSBlockDistribution(
final FileSystem fs, final Reference reference, final FileStatus status)
throws IOException {
if (status == null) {
return null;
}
long start = 0;
long length = 0;
if (Reference.isTopFileRegion(reference.getFileRegion())) {
start = status.getLen()/2;
length = status.getLen() - status.getLen()/2;
} else {
start = 0;
length = status.getLen()/2;
}
return FSUtils.computeHDFSBlocksDistribution(fs, status, start, length);
}
}