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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.io.hfile;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.SequenceInputStream;
import java.security.Key;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;
import org.apache.commons.io.IOUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.io.crypto.Cipher;
import org.apache.hadoop.hbase.io.crypto.Encryption;
import org.apache.hadoop.hbase.protobuf.ProtobufMagic;
import org.apache.hadoop.hbase.security.EncryptionUtil;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.hbase.thirdparty.com.google.protobuf.UnsafeByteOperations;
import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos;
import org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.BytesBytesPair;
import org.apache.hadoop.hbase.shaded.protobuf.generated.HFileProtos;
/**
* Metadata Map of attributes for HFile written out as HFile Trailer. Created by the Writer and
* added to the tail of the file just before close. Metadata includes core attributes such as last
* key seen, comparator used writing the file, etc. Clients can add their own attributes via
* {@link #append(byte[], byte[], boolean)} and they'll be persisted and available at read time.
* Reader creates the HFileInfo on open by reading the tail of the HFile. The parse of the HFile
* trailer also creates a {@link HFileContext}, a read-only data structure that includes bulk of
* the HFileInfo and extras that is safe to pass around when working on HFiles.
* @see HFileContext
*/
@InterfaceAudience.Private
public class HFileInfo implements SortedMap {
static final String RESERVED_PREFIX = "hfile.";
static final byte[] RESERVED_PREFIX_BYTES = Bytes.toBytes(RESERVED_PREFIX);
static final byte [] LASTKEY = Bytes.toBytes(RESERVED_PREFIX + "LASTKEY");
static final byte [] AVG_KEY_LEN = Bytes.toBytes(RESERVED_PREFIX + "AVG_KEY_LEN");
static final byte [] AVG_VALUE_LEN = Bytes.toBytes(RESERVED_PREFIX + "AVG_VALUE_LEN");
static final byte [] CREATE_TIME_TS = Bytes.toBytes(RESERVED_PREFIX + "CREATE_TIME_TS");
static final byte [] TAGS_COMPRESSED = Bytes.toBytes(RESERVED_PREFIX + "TAGS_COMPRESSED");
public static final byte [] MAX_TAGS_LEN = Bytes.toBytes(RESERVED_PREFIX + "MAX_TAGS_LEN");
private final SortedMap map = new TreeMap<>(Bytes.BYTES_COMPARATOR);
/**
* We can read files whose major version is v2 IFF their minor version is at least 3.
*/
private static final int MIN_V2_MINOR_VERSION_WITH_PB = 3;
/** Maximum minor version supported by this HFile format */
// We went to version 2 when we moved to pb'ing fileinfo and the trailer on
// the file. This version can read Writables version 1.
static final int MAX_MINOR_VERSION = 3;
/** Last key in the file. Filled in when we read in the file info */
private Cell lastKeyCell = null;
/** Average key length read from file info */
private int avgKeyLen = -1;
/** Average value length read from file info */
private int avgValueLen = -1;
private boolean includesMemstoreTS = false;
private boolean decodeMemstoreTS = false;
/**
* Blocks read from the load-on-open section, excluding data root index, meta
* index, and file info.
*/
private List loadOnOpenBlocks = new ArrayList<>();
/**
* The iterator will track all blocks in load-on-open section, since we use the
* {@link org.apache.hadoop.hbase.io.ByteBuffAllocator} to manage the ByteBuffers in block now,
* so we must ensure that deallocate all ByteBuffers in the end.
*/
private HFileBlock.BlockIterator blockIter;
private HFileBlockIndex.CellBasedKeyBlockIndexReader dataIndexReader;
private HFileBlockIndex.ByteArrayKeyBlockIndexReader metaIndexReader;
private FixedFileTrailer trailer;
private HFileContext hfileContext;
public HFileInfo() {
super();
}
public HFileInfo(ReaderContext context, Configuration conf) throws IOException {
this.initTrailerAndContext(context, conf);
}
/**
* Append the given key/value pair to the file info, optionally checking the
* key prefix.
*
* @param k key to add
* @param v value to add
* @param checkPrefix whether to check that the provided key does not start
* with the reserved prefix
* @return this file info object
* @throws IOException if the key or value is invalid
*/
public HFileInfo append(final byte[] k, final byte[] v,
final boolean checkPrefix) throws IOException {
if (k == null || v == null) {
throw new NullPointerException("Key nor value may be null");
}
if (checkPrefix && isReservedFileInfoKey(k)) {
throw new IOException("Keys with a " + HFileInfo.RESERVED_PREFIX
+ " are reserved");
}
put(k, v);
return this;
}
/** Return true if the given file info key is reserved for internal use. */
public static boolean isReservedFileInfoKey(byte[] key) {
return Bytes.startsWith(key, HFileInfo.RESERVED_PREFIX_BYTES);
}
@Override
public void clear() {
this.map.clear();
}
@Override
public Comparator comparator() {
return map.comparator();
}
@Override
public boolean containsKey(Object key) {
return map.containsKey(key);
}
@Override
public boolean containsValue(Object value) {
return map.containsValue(value);
}
@Override
public Set> entrySet() {
return map.entrySet();
}
@Override
public boolean equals(Object o) {
return map.equals(o);
}
@Override
public byte[] firstKey() {
return map.firstKey();
}
@Override
public byte[] get(Object key) {
return map.get(key);
}
@Override
public int hashCode() {
return map.hashCode();
}
@Override
public SortedMap headMap(byte[] toKey) {
return this.map.headMap(toKey);
}
@Override
public boolean isEmpty() {
return map.isEmpty();
}
@Override
public Set keySet() {
return map.keySet();
}
@Override
public byte[] lastKey() {
return map.lastKey();
}
@Override
public byte[] put(byte[] key, byte[] value) {
return this.map.put(key, value);
}
@Override
public void putAll(Map m) {
this.map.putAll(m);
}
@Override
public byte[] remove(Object key) {
return this.map.remove(key);
}
@Override
public int size() {
return map.size();
}
@Override
public SortedMap subMap(byte[] fromKey, byte[] toKey) {
return this.map.subMap(fromKey, toKey);
}
@Override
public SortedMap tailMap(byte[] fromKey) {
return this.map.tailMap(fromKey);
}
@Override
public Collection values() {
return map.values();
}
/**
* Write out this instance on the passed in out stream.
* We write it as a protobuf.
* @see #read(DataInputStream)
*/
void write(final DataOutputStream out) throws IOException {
HFileProtos.FileInfoProto.Builder builder = HFileProtos.FileInfoProto.newBuilder();
for (Map.Entry e: this.map.entrySet()) {
HBaseProtos.BytesBytesPair.Builder bbpBuilder = HBaseProtos.BytesBytesPair.newBuilder();
bbpBuilder.setFirst(UnsafeByteOperations.unsafeWrap(e.getKey()));
bbpBuilder.setSecond(UnsafeByteOperations.unsafeWrap(e.getValue()));
builder.addMapEntry(bbpBuilder.build());
}
out.write(ProtobufMagic.PB_MAGIC);
builder.build().writeDelimitedTo(out);
}
/**
* Populate this instance with what we find on the passed in in stream.
* Can deserialize protobuf of old Writables format.
* @see #write(DataOutputStream)
*/
void read(final DataInputStream in) throws IOException {
// This code is tested over in TestHFileReaderV1 where we read an old hfile w/ this new code.
int pblen = ProtobufUtil.lengthOfPBMagic();
byte [] pbuf = new byte[pblen];
if (in.markSupported()) {
in.mark(pblen);
}
int read = in.read(pbuf);
if (read != pblen) {
throw new IOException("read=" + read + ", wanted=" + pblen);
}
if (ProtobufUtil.isPBMagicPrefix(pbuf)) {
parsePB(HFileProtos.FileInfoProto.parseDelimitedFrom(in));
} else {
if (in.markSupported()) {
in.reset();
parseWritable(in);
} else {
// We cannot use BufferedInputStream, it consumes more than we read from the underlying IS
ByteArrayInputStream bais = new ByteArrayInputStream(pbuf);
SequenceInputStream sis = new SequenceInputStream(bais, in); // Concatenate input streams
// TODO: Am I leaking anything here wrapping the passed in stream? We are not calling
// close on the wrapped streams but they should be let go after we leave this context?
// I see that we keep a reference to the passed in inputstream but since we no longer
// have a reference to this after we leave, we should be ok.
parseWritable(new DataInputStream(sis));
}
}
}
/**
* Now parse the old Writable format. It was a list of Map entries. Each map entry was a
* key and a value of a byte []. The old map format had a byte before each entry that held
* a code which was short for the key or value type. We know it was a byte [] so in below
* we just read and dump it.
*/
void parseWritable(final DataInputStream in) throws IOException {
// First clear the map.
// Otherwise we will just accumulate entries every time this method is called.
this.map.clear();
// Read the number of entries in the map
int entries = in.readInt();
// Then read each key/value pair
for (int i = 0; i < entries; i++) {
byte [] key = Bytes.readByteArray(in);
// We used to read a byte that encoded the class type.
// Read and ignore it because it is always byte [] in hfile
in.readByte();
byte [] value = Bytes.readByteArray(in);
this.map.put(key, value);
}
}
/**
* Fill our map with content of the pb we read off disk
* @param fip protobuf message to read
*/
void parsePB(final HFileProtos.FileInfoProto fip) {
this.map.clear();
for (BytesBytesPair pair: fip.getMapEntryList()) {
this.map.put(pair.getFirst().toByteArray(), pair.getSecond().toByteArray());
}
}
public void initTrailerAndContext(ReaderContext context, Configuration conf) throws IOException {
try {
boolean isHBaseChecksum = context.getInputStreamWrapper().shouldUseHBaseChecksum();
trailer = FixedFileTrailer.readFromStream(context.getInputStreamWrapper()
.getStream(isHBaseChecksum), context.getFileSize());
Path path = context.getFilePath();
checkFileVersion(path);
this.hfileContext = createHFileContext(path, trailer, conf);
context.getInputStreamWrapper().unbuffer();
} catch (Throwable t) {
IOUtils.closeQuietly(context.getInputStreamWrapper());
throw new CorruptHFileException("Problem reading HFile Trailer from file "
+ context.getFilePath(), t);
}
}
/**
* should be called after initTrailerAndContext
*/
public void initMetaAndIndex(HFile.Reader reader) throws IOException {
ReaderContext context = reader.getContext();
try {
HFileBlock.FSReader blockReader = reader.getUncachedBlockReader();
// Initialize an block iterator, and parse load-on-open blocks in the following.
blockIter = blockReader.blockRange(trailer.getLoadOnOpenDataOffset(),
context.getFileSize() - trailer.getTrailerSize());
// Data index. We also read statistics about the block index written after
// the root level.
this.dataIndexReader =
new HFileBlockIndex.CellBasedKeyBlockIndexReader(trailer.createComparator(), trailer.getNumDataIndexLevels());
dataIndexReader
.readMultiLevelIndexRoot(blockIter.nextBlockWithBlockType(BlockType.ROOT_INDEX), trailer.getDataIndexCount());
reader.setDataBlockIndexReader(dataIndexReader);
// Meta index.
this.metaIndexReader = new HFileBlockIndex.ByteArrayKeyBlockIndexReader(1);
metaIndexReader.readRootIndex(blockIter.nextBlockWithBlockType(BlockType.ROOT_INDEX),
trailer.getMetaIndexCount());
reader.setMetaBlockIndexReader(metaIndexReader);
loadMetaInfo(blockIter, hfileContext);
reader.setDataBlockEncoder(HFileDataBlockEncoderImpl.createFromFileInfo(this));
// Load-On-Open info
HFileBlock b;
while ((b = blockIter.nextBlock()) != null) {
loadOnOpenBlocks.add(b);
}
// close the block reader
context.getInputStreamWrapper().unbuffer();
} catch (Throwable t) {
IOUtils.closeQuietly(context.getInputStreamWrapper());
throw new CorruptHFileException("Problem reading data index and meta index from file "
+ context.getFilePath(), t);
}
}
private HFileContext createHFileContext(Path path,
FixedFileTrailer trailer, Configuration conf) throws IOException {
HFileContextBuilder builder = new HFileContextBuilder()
.withHBaseCheckSum(true)
.withHFileName(path.getName())
.withCompression(trailer.getCompressionCodec())
.withCellComparator(FixedFileTrailer.createComparator(trailer.getComparatorClassName()));
// Check for any key material available
byte[] keyBytes = trailer.getEncryptionKey();
if (keyBytes != null) {
Encryption.Context cryptoContext = Encryption.newContext(conf);
Key key = EncryptionUtil.unwrapKey(conf, keyBytes);
// Use the algorithm the key wants
Cipher cipher = Encryption.getCipher(conf, key.getAlgorithm());
if (cipher == null) {
throw new IOException("Cipher '" + key.getAlgorithm() + "' is not available"
+ ", path=" + path);
}
cryptoContext.setCipher(cipher);
cryptoContext.setKey(key);
builder.withEncryptionContext(cryptoContext);
}
HFileContext context = builder.build();
return context;
}
private void loadMetaInfo(HFileBlock.BlockIterator blockIter, HFileContext hfileContext)
throws IOException {
read(blockIter.nextBlockWithBlockType(BlockType.FILE_INFO).getByteStream());
byte[] creationTimeBytes = get(HFileInfo.CREATE_TIME_TS);
hfileContext.setFileCreateTime(creationTimeBytes == null ?
0 : Bytes.toLong(creationTimeBytes));
byte[] tmp = get(HFileInfo.MAX_TAGS_LEN);
// max tag length is not present in the HFile means tags were not at all written to file.
if (tmp != null) {
hfileContext.setIncludesTags(true);
tmp = get(HFileInfo.TAGS_COMPRESSED);
if (tmp != null && Bytes.toBoolean(tmp)) {
hfileContext.setCompressTags(true);
}
}
// parse meta info
if (get(HFileInfo.LASTKEY) != null) {
lastKeyCell = new KeyValue.KeyOnlyKeyValue(get(HFileInfo.LASTKEY));
}
avgKeyLen = Bytes.toInt(get(HFileInfo.AVG_KEY_LEN));
avgValueLen = Bytes.toInt(get(HFileInfo.AVG_VALUE_LEN));
byte [] keyValueFormatVersion = get(HFileWriterImpl.KEY_VALUE_VERSION);
includesMemstoreTS = keyValueFormatVersion != null &&
Bytes.toInt(keyValueFormatVersion) == HFileWriterImpl.KEY_VALUE_VER_WITH_MEMSTORE;
hfileContext.setIncludesMvcc(includesMemstoreTS);
if (includesMemstoreTS) {
decodeMemstoreTS = Bytes.toLong(get(HFileWriterImpl.MAX_MEMSTORE_TS_KEY)) > 0;
}
}
/**
* File version check is a little sloppy. We read v3 files but can also read v2 files if their
* content has been pb'd; files written with 0.98.
*/
private void checkFileVersion(Path path) {
int majorVersion = trailer.getMajorVersion();
if (majorVersion == getMajorVersion()) {
return;
}
int minorVersion = trailer.getMinorVersion();
if (majorVersion == 2 && minorVersion >= MIN_V2_MINOR_VERSION_WITH_PB) {
return;
}
// We can read v3 or v2 versions of hfile.
throw new IllegalArgumentException("Invalid HFile version: major=" +
trailer.getMajorVersion() + ", minor=" + trailer.getMinorVersion() + ": expected at least " +
"major=2 and minor=" + MAX_MINOR_VERSION + ", path=" + path);
}
public void close() {
if (blockIter != null) {
blockIter.freeBlocks();
}
}
public int getMajorVersion() {
return 3;
}
public void setTrailer(FixedFileTrailer trailer) {
this.trailer = trailer;
}
public FixedFileTrailer getTrailer() {
return this.trailer;
}
public HFileBlockIndex.CellBasedKeyBlockIndexReader getDataBlockIndexReader() {
return this.dataIndexReader;
}
public HFileBlockIndex.ByteArrayKeyBlockIndexReader getMetaBlockIndexReader() {
return this.metaIndexReader;
}
public HFileContext getHFileContext() {
return this.hfileContext;
}
public List getLoadOnOpenBlocks() {
return loadOnOpenBlocks;
}
public Cell getLastKeyCell() {
return lastKeyCell;
}
public int getAvgKeyLen() {
return avgKeyLen;
}
public int getAvgValueLen() {
return avgValueLen;
}
public boolean shouldIncludeMemStoreTS() {
return includesMemstoreTS;
}
public boolean isDecodeMemstoreTS() {
return decodeMemstoreTS;
}
}