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Server functionality for HBase
/**
* 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.snapshot;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorCompletionService;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.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.HRegionInfo;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.io.HFileLink;
import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription;
import org.apache.hadoop.hbase.protobuf.generated.SnapshotProtos.SnapshotRegionManifest;
import org.apache.hadoop.hbase.regionserver.wal.HLogUtil;
import org.apache.hadoop.hbase.regionserver.StoreFileInfo;
import org.apache.hadoop.hbase.util.FSVisitor;
/**
* Utility methods for interacting with the snapshot referenced files.
*/
@InterfaceAudience.Private
public final class SnapshotReferenceUtil {
public static final Log LOG = LogFactory.getLog(SnapshotReferenceUtil.class);
public interface StoreFileVisitor {
void storeFile(final HRegionInfo regionInfo, final String familyName,
final SnapshotRegionManifest.StoreFile storeFile) throws IOException;
}
public interface SnapshotVisitor extends StoreFileVisitor,
FSVisitor.LogFileVisitor {
}
private SnapshotReferenceUtil() {
// private constructor for utility class
}
/**
* Get log directory for a server in a snapshot.
*
* @param snapshotDir directory where the specific snapshot is stored
* @param serverName name of the parent regionserver for the log files
* @return path to the log home directory for the archive files.
*/
public static Path getLogsDir(Path snapshotDir, String serverName) {
return new Path(snapshotDir, HLogUtil.getHLogDirectoryName(serverName));
}
/**
* Iterate over the snapshot store files, restored.edits and logs
*
* @param conf The current {@link Configuration} instance.
* @param fs {@link FileSystem}
* @param snapshotDir {@link Path} to the Snapshot directory
* @param visitor callback object to get the referenced files
* @throws IOException if an error occurred while scanning the directory
*/
public static void visitReferencedFiles(final Configuration conf, final FileSystem fs,
final Path snapshotDir, final SnapshotVisitor visitor)
throws IOException {
SnapshotDescription desc = SnapshotDescriptionUtils.readSnapshotInfo(fs, snapshotDir);
visitReferencedFiles(conf, fs, snapshotDir, desc, visitor);
}
/**
* Iterate over the snapshot store files, restored.edits and logs
*
* @param conf The current {@link Configuration} instance.
* @param fs {@link FileSystem}
* @param snapshotDir {@link Path} to the Snapshot directory
* @param desc the {@link SnapshotDescription} of the snapshot to verify
* @param visitor callback object to get the referenced files
* @throws IOException if an error occurred while scanning the directory
*/
public static void visitReferencedFiles(final Configuration conf, final FileSystem fs,
final Path snapshotDir, final SnapshotDescription desc, final SnapshotVisitor visitor)
throws IOException {
visitTableStoreFiles(conf, fs, snapshotDir, desc, visitor);
visitLogFiles(fs, snapshotDir, visitor);
}
/**©
* Iterate over the snapshot store files
*
* @param conf The current {@link Configuration} instance.
* @param fs {@link FileSystem}
* @param snapshotDir {@link Path} to the Snapshot directory
* @param desc the {@link SnapshotDescription} of the snapshot to verify
* @param visitor callback object to get the store files
* @throws IOException if an error occurred while scanning the directory
*/
static void visitTableStoreFiles(final Configuration conf, final FileSystem fs,
final Path snapshotDir, final SnapshotDescription desc, final StoreFileVisitor visitor)
throws IOException {
SnapshotManifest manifest = SnapshotManifest.open(conf, fs, snapshotDir, desc);
List regionManifests = manifest.getRegionManifests();
if (regionManifests == null || regionManifests.size() == 0) {
LOG.debug("No manifest files present: " + snapshotDir);
return;
}
for (SnapshotRegionManifest regionManifest: regionManifests) {
visitRegionStoreFiles(regionManifest, visitor);
}
}
/**
* Iterate over the snapshot store files in the specified region
*
* @param manifest snapshot manifest to inspect
* @param visitor callback object to get the store files
* @throws IOException if an error occurred while scanning the directory
*/
static void visitRegionStoreFiles(final SnapshotRegionManifest manifest,
final StoreFileVisitor visitor) throws IOException {
HRegionInfo regionInfo = HRegionInfo.convert(manifest.getRegionInfo());
for (SnapshotRegionManifest.FamilyFiles familyFiles: manifest.getFamilyFilesList()) {
String familyName = familyFiles.getFamilyName().toStringUtf8();
for (SnapshotRegionManifest.StoreFile storeFile: familyFiles.getStoreFilesList()) {
visitor.storeFile(regionInfo, familyName, storeFile);
}
}
}
/**
* Iterate over the snapshot log files
*
* @param fs {@link FileSystem}
* @param snapshotDir {@link Path} to the Snapshot directory
* @param visitor callback object to get the log files
* @throws IOException if an error occurred while scanning the directory
*/
public static void visitLogFiles(final FileSystem fs, final Path snapshotDir,
final FSVisitor.LogFileVisitor visitor) throws IOException {
FSVisitor.visitLogFiles(fs, snapshotDir, visitor);
}
/**
* Verify the validity of the snapshot
*
* @param conf The current {@link Configuration} instance.
* @param fs {@link FileSystem}
* @param snapshotDir {@link Path} to the Snapshot directory of the snapshot to verify
* @param snapshotDesc the {@link SnapshotDescription} of the snapshot to verify
* @throws CorruptedSnapshotException if the snapshot is corrupted
* @throws IOException if an error occurred while scanning the directory
*/
public static void verifySnapshot(final Configuration conf, final FileSystem fs,
final Path snapshotDir, final SnapshotDescription snapshotDesc) throws IOException {
SnapshotManifest manifest = SnapshotManifest.open(conf, fs, snapshotDir, snapshotDesc);
verifySnapshot(conf, fs, manifest);
}
/**
* Verify the validity of the snapshot
*
* @param conf The current {@link Configuration} instance.
* @param fs {@link FileSystem}
* @param manifest snapshot manifest to inspect
* @throws CorruptedSnapshotException if the snapshot is corrupted
* @throws IOException if an error occurred while scanning the directory
*/
public static void verifySnapshot(final Configuration conf, final FileSystem fs,
final SnapshotManifest manifest) throws IOException {
final SnapshotDescription snapshotDesc = manifest.getSnapshotDescription();
final Path snapshotDir = manifest.getSnapshotDir();
concurrentVisitReferencedFiles(conf, fs, manifest, new StoreFileVisitor() {
@Override
public void storeFile(final HRegionInfo regionInfo, final String family,
final SnapshotRegionManifest.StoreFile storeFile) throws IOException {
verifyStoreFile(conf, fs, snapshotDir, snapshotDesc, regionInfo, family, storeFile);
}
});
}
public static void concurrentVisitReferencedFiles(final Configuration conf, final FileSystem fs,
final SnapshotManifest manifest, final StoreFileVisitor visitor) throws IOException {
final SnapshotDescription snapshotDesc = manifest.getSnapshotDescription();
final Path snapshotDir = manifest.getSnapshotDir();
List regionManifests = manifest.getRegionManifests();
if (regionManifests == null || regionManifests.size() == 0) {
LOG.debug("No manifest files present: " + snapshotDir);
return;
}
ExecutorService exec = SnapshotManifest.createExecutor(conf, "VerifySnapshot");
final ExecutorCompletionService completionService =
new ExecutorCompletionService(exec);
try {
for (final SnapshotRegionManifest regionManifest: regionManifests) {
completionService.submit(new Callable() {
@Override
public Void call() throws IOException {
visitRegionStoreFiles(regionManifest, visitor);
return null;
}
});
}
try {
for (int i = 0; i < regionManifests.size(); ++i) {
completionService.take().get();
}
} catch (InterruptedException e) {
throw new InterruptedIOException(e.getMessage());
} catch (ExecutionException e) {
if (e.getCause() instanceof CorruptedSnapshotException) {
throw new CorruptedSnapshotException(e.getCause().getMessage(), snapshotDesc);
} else {
IOException ex = new IOException();
ex.initCause(e.getCause());
throw ex;
}
}
} finally {
exec.shutdown();
}
}
/**
* Verify the validity of the snapshot store file
*
* @param conf The current {@link Configuration} instance.
* @param fs {@link FileSystem}
* @param snapshotDir {@link Path} to the Snapshot directory of the snapshot to verify
* @param snapshot the {@link SnapshotDescription} of the snapshot to verify
* @param regionInfo {@link HRegionInfo} of the region that contains the store file
* @param family family that contains the store file
* @param storeFile the store file to verify
* @throws CorruptedSnapshotException if the snapshot is corrupted
* @throws IOException if an error occurred while scanning the directory
*/
private static void verifyStoreFile(final Configuration conf, final FileSystem fs,
final Path snapshotDir, final SnapshotDescription snapshot, final HRegionInfo regionInfo,
final String family, final SnapshotRegionManifest.StoreFile storeFile) throws IOException {
TableName table = TableName.valueOf(snapshot.getTable());
String fileName = storeFile.getName();
Path refPath = null;
if (StoreFileInfo.isReference(fileName)) {
// If is a reference file check if the parent file is present in the snapshot
refPath = new Path(new Path(regionInfo.getEncodedName(), family), fileName);
refPath = StoreFileInfo.getReferredToFile(refPath);
String refRegion = refPath.getParent().getParent().getName();
refPath = HFileLink.createPath(table, refRegion, family, refPath.getName());
if (!new HFileLink(conf, refPath).exists(fs)) {
throw new CorruptedSnapshotException("Missing parent hfile for: " + fileName +
" path=" + refPath, snapshot);
}
if (storeFile.hasReference()) {
// We don't really need to look for the file on-disk
// we already have the Reference information embedded here.
return;
}
}
Path linkPath;
if (refPath != null && HFileLink.isHFileLink(refPath)) {
linkPath = new Path(family, refPath.getName());
} else if (HFileLink.isHFileLink(fileName)) {
linkPath = new Path(family, fileName);
} else {
linkPath = new Path(family, HFileLink.createHFileLinkName(
table, regionInfo.getEncodedName(), fileName));
}
// check if the linked file exists (in the archive, or in the table dir)
HFileLink link = new HFileLink(conf, linkPath);
try {
FileStatus fstat = link.getFileStatus(fs);
if (storeFile.hasFileSize() && storeFile.getFileSize() != fstat.getLen()) {
String msg = "hfile: " + fileName + " size does not match with the expected one. " +
" found=" + fstat.getLen() + " expected=" + storeFile.getFileSize();
LOG.error(msg);
throw new CorruptedSnapshotException(msg, snapshot);
}
} catch (FileNotFoundException e) {
String msg = "Can't find hfile: " + fileName + " in the real (" +
link.getOriginPath() + ") or archive (" + link.getArchivePath()
+ ") directory for the primary table.";
LOG.error(msg);
throw new CorruptedSnapshotException(msg, snapshot);
}
}
/**
* Returns the store file names in the snapshot.
*
* @param conf The current {@link Configuration} instance.
* @param fs {@link FileSystem}
* @param snapshotDir {@link Path} to the Snapshot directory
* @throws IOException if an error occurred while scanning the directory
* @return the names of hfiles in the specified snaphot
*/
public static Set getHFileNames(final Configuration conf, final FileSystem fs,
final Path snapshotDir) throws IOException {
SnapshotDescription desc = SnapshotDescriptionUtils.readSnapshotInfo(fs, snapshotDir);
return getHFileNames(conf, fs, snapshotDir, desc);
}
/**
* Returns the store file names in the snapshot.
*
* @param conf The current {@link Configuration} instance.
* @param fs {@link FileSystem}
* @param snapshotDir {@link Path} to the Snapshot directory
* @param snapshotDesc the {@link SnapshotDescription} of the snapshot to inspect
* @throws IOException if an error occurred while scanning the directory
* @return the names of hfiles in the specified snaphot
*/
private static Set getHFileNames(final Configuration conf, final FileSystem fs,
final Path snapshotDir, final SnapshotDescription snapshotDesc)
throws IOException {
final Set names = new HashSet();
visitTableStoreFiles(conf, fs, snapshotDir, snapshotDesc, new StoreFileVisitor() {
@Override
public void storeFile(final HRegionInfo regionInfo, final String family,
final SnapshotRegionManifest.StoreFile storeFile) throws IOException {
String hfile = storeFile.getName();
if (HFileLink.isHFileLink(hfile)) {
names.add(HFileLink.getReferencedHFileName(hfile));
} else {
names.add(hfile);
}
}
});
return names;
}
/**
* Returns the log file names available in the snapshot.
*
* @param fs {@link FileSystem}
* @param snapshotDir {@link Path} to the Snapshot directory
* @throws IOException if an error occurred while scanning the directory
* @return the names of hlogs in the specified snaphot
*/
public static Set getHLogNames(final FileSystem fs, final Path snapshotDir)
throws IOException {
final Set names = new HashSet();
visitLogFiles(fs, snapshotDir, new FSVisitor.LogFileVisitor() {
@Override
public void logFile (final String server, final String logfile) throws IOException {
names.add(logfile);
}
});
return names;
}
}