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Main 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 com.google.protobuf.InvalidProtocolBufferException;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.Executor;
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.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription;
import org.apache.hadoop.hbase.protobuf.generated.SnapshotProtos.SnapshotRegionManifest;
import org.apache.hadoop.hbase.regionserver.StoreFileInfo;
import org.apache.hadoop.hbase.util.ByteStringer;
import org.apache.hadoop.hbase.util.FSUtils;
/**
* DO NOT USE DIRECTLY. USE {@link SnapshotManifest}.
*
* Snapshot v2 layout format
* - Single Manifest file containing all the information of regions
* - In the online-snapshot case each region will write a "region manifest"
* /snapshotName/manifest.regionName
*/
@InterfaceAudience.Private
public final class SnapshotManifestV2 {
private static final Log LOG = LogFactory.getLog(SnapshotManifestV2.class);
public static final int DESCRIPTOR_VERSION = 2;
public static final String SNAPSHOT_MANIFEST_PREFIX = "region-manifest.";
private SnapshotManifestV2() {}
static class ManifestBuilder implements SnapshotManifest.RegionVisitor<
SnapshotRegionManifest.Builder, SnapshotRegionManifest.FamilyFiles.Builder> {
private final Configuration conf;
private final Path snapshotDir;
private final FileSystem fs;
public ManifestBuilder(final Configuration conf, final FileSystem fs, final Path snapshotDir) {
this.snapshotDir = snapshotDir;
this.conf = conf;
this.fs = fs;
}
public SnapshotRegionManifest.Builder regionOpen(final HRegionInfo regionInfo) {
SnapshotRegionManifest.Builder manifest = SnapshotRegionManifest.newBuilder();
manifest.setRegionInfo(HRegionInfo.convert(regionInfo));
return manifest;
}
public void regionClose(final SnapshotRegionManifest.Builder region) throws IOException {
// we should ensure the snapshot dir exist, maybe it has been deleted by master
// see HBASE-16464
if (fs.exists(snapshotDir)) {
SnapshotRegionManifest manifest = region.build();
FSDataOutputStream stream = fs.create(getRegionManifestPath(snapshotDir, manifest));
try {
manifest.writeTo(stream);
} finally {
stream.close();
}
} else {
LOG.warn("can't write manifest without parent dir, maybe it has been deleted by master?");
}
}
public SnapshotRegionManifest.FamilyFiles.Builder familyOpen(
final SnapshotRegionManifest.Builder region, final byte[] familyName) {
SnapshotRegionManifest.FamilyFiles.Builder family =
SnapshotRegionManifest.FamilyFiles.newBuilder();
family.setFamilyName(ByteStringer.wrap(familyName));
return family;
}
public void familyClose(final SnapshotRegionManifest.Builder region,
final SnapshotRegionManifest.FamilyFiles.Builder family) {
region.addFamilyFiles(family.build());
}
public void storeFile(final SnapshotRegionManifest.Builder region,
final SnapshotRegionManifest.FamilyFiles.Builder family, final StoreFileInfo storeFile)
throws IOException {
SnapshotRegionManifest.StoreFile.Builder sfManifest =
SnapshotRegionManifest.StoreFile.newBuilder();
sfManifest.setName(storeFile.getPath().getName());
if (storeFile.isReference()) {
sfManifest.setReference(storeFile.getReference().convert());
}
sfManifest.setFileSize(storeFile.getReferencedFileStatus(fs).getLen());
family.addStoreFiles(sfManifest.build());
}
}
static List loadRegionManifests(final Configuration conf,
final Executor executor,final FileSystem fs, final Path snapshotDir,
final SnapshotDescription desc) throws IOException {
FileStatus[] manifestFiles = FSUtils.listStatus(fs, snapshotDir, new PathFilter() {
@Override
public boolean accept(Path path) {
return path.getName().startsWith(SNAPSHOT_MANIFEST_PREFIX);
}
});
if (manifestFiles == null || manifestFiles.length == 0) return null;
final ExecutorCompletionService completionService =
new ExecutorCompletionService(executor);
for (final FileStatus st: manifestFiles) {
completionService.submit(new Callable() {
@Override
public SnapshotRegionManifest call() throws IOException {
FSDataInputStream stream = fs.open(st.getPath());
try {
return SnapshotRegionManifest.parseFrom(stream);
} finally {
stream.close();
}
}
});
}
ArrayList regionsManifest =
new ArrayList(manifestFiles.length);
try {
for (int i = 0; i < manifestFiles.length; ++i) {
regionsManifest.add(completionService.take().get());
}
} catch (InterruptedException e) {
throw new InterruptedIOException(e.getMessage());
} catch (ExecutionException e) {
Throwable t = e.getCause();
if(t instanceof InvalidProtocolBufferException) {
throw (InvalidProtocolBufferException)t;
} else {
IOException ex = new IOException("ExecutionException");
ex.initCause(e.getCause());
throw ex;
}
}
return regionsManifest;
}
static void deleteRegionManifest(final FileSystem fs, final Path snapshotDir,
final SnapshotRegionManifest manifest) throws IOException {
fs.delete(getRegionManifestPath(snapshotDir, manifest), true);
}
private static Path getRegionManifestPath(final Path snapshotDir,
final SnapshotRegionManifest manifest) {
String regionName = SnapshotManifest.getRegionNameFromManifest(manifest);
return new Path(snapshotDir, SNAPSHOT_MANIFEST_PREFIX + regionName);
}
}