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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.io.hfile;
import java.io.DataOutput;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellComparator;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.KeyValue.KVComparator;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.io.hfile.HFile.Writer;
import org.apache.hadoop.hbase.io.hfile.HFileBlock.BlockWritable;
import org.apache.hadoop.hbase.util.BloomFilterWriter;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.io.Writable;
/**
* Writes HFile format version 2.
*/
@InterfaceAudience.Private
public class HFileWriterV2 extends AbstractHFileWriter {
static final Log LOG = LogFactory.getLog(HFileWriterV2.class);
/** Max memstore (mvcc) timestamp in FileInfo */
public static final byte [] MAX_MEMSTORE_TS_KEY =
Bytes.toBytes("MAX_MEMSTORE_TS_KEY");
/** KeyValue version in FileInfo */
public static final byte [] KEY_VALUE_VERSION =
Bytes.toBytes("KEY_VALUE_VERSION");
/** Version for KeyValue which includes memstore timestamp */
public static final int KEY_VALUE_VER_WITH_MEMSTORE = 1;
/** Inline block writers for multi-level block index and compound Blooms. */
private List inlineBlockWriters =
new ArrayList();
/** Unified version 2 block writer */
protected HFileBlock.Writer fsBlockWriter;
private HFileBlockIndex.BlockIndexWriter dataBlockIndexWriter;
private HFileBlockIndex.BlockIndexWriter metaBlockIndexWriter;
/** The offset of the first data block or -1 if the file is empty. */
private long firstDataBlockOffset = -1;
/** The offset of the last data block or 0 if the file is empty. */
protected long lastDataBlockOffset;
/**
* The last(stop) Cell of the previous data block.
* This reference should be short-lived since we write hfiles in a burst.
*/
private Cell lastCellOfPreviousBlock = null;
/** Additional data items to be written to the "load-on-open" section. */
private List additionalLoadOnOpenData =
new ArrayList();
protected long maxMemstoreTS = 0;
static class WriterFactoryV2 extends HFile.WriterFactory {
WriterFactoryV2(Configuration conf, CacheConfig cacheConf) {
super(conf, cacheConf);
}
@Override
public Writer createWriter(FileSystem fs, Path path,
FSDataOutputStream ostream,
KVComparator comparator, HFileContext context) throws IOException {
context.setIncludesTags(false);// HFile V2 does not deal with tags at all!
return new HFileWriterV2(conf, cacheConf, fs, path, ostream,
comparator, context);
}
}
/** Constructor that takes a path, creates and closes the output stream. */
public HFileWriterV2(Configuration conf, CacheConfig cacheConf,
FileSystem fs, Path path, FSDataOutputStream ostream,
final KVComparator comparator, final HFileContext context) throws IOException {
super(cacheConf,
ostream == null ? createOutputStream(conf, fs, path, null) : ostream,
path, comparator, context);
finishInit(conf);
}
/** Additional initialization steps */
protected void finishInit(final Configuration conf) {
if (fsBlockWriter != null)
throw new IllegalStateException("finishInit called twice");
fsBlockWriter = new HFileBlock.Writer(blockEncoder, hFileContext);
// Data block index writer
boolean cacheIndexesOnWrite = cacheConf.shouldCacheIndexesOnWrite();
dataBlockIndexWriter = new HFileBlockIndex.BlockIndexWriter(fsBlockWriter,
cacheIndexesOnWrite ? cacheConf : null,
cacheIndexesOnWrite ? name : null);
dataBlockIndexWriter.setMaxChunkSize(
HFileBlockIndex.getMaxChunkSize(conf));
inlineBlockWriters.add(dataBlockIndexWriter);
// Meta data block index writer
metaBlockIndexWriter = new HFileBlockIndex.BlockIndexWriter();
if (LOG.isTraceEnabled()) LOG.trace("Initialized with " + cacheConf);
}
/**
* At a block boundary, write all the inline blocks and opens new block.
*
* @throws IOException
*/
protected void checkBlockBoundary() throws IOException {
if (fsBlockWriter.blockSizeWritten() < hFileContext.getBlocksize())
return;
finishBlock();
writeInlineBlocks(false);
newBlock();
}
/** Clean up the current data block */
private void finishBlock() throws IOException {
if (!fsBlockWriter.isWriting() || fsBlockWriter.blockSizeWritten() == 0)
return;
// Update the first data block offset for scanning.
if (firstDataBlockOffset == -1) {
firstDataBlockOffset = outputStream.getPos();
}
// Update the last data block offset
lastDataBlockOffset = outputStream.getPos();
fsBlockWriter.writeHeaderAndData(outputStream);
int onDiskSize = fsBlockWriter.getOnDiskSizeWithHeader();
Cell indexEntry =
CellComparator.getMidpoint(this.comparator, lastCellOfPreviousBlock, firstCellInBlock);
dataBlockIndexWriter.addEntry(CellUtil.getCellKeySerializedAsKeyValueKey(indexEntry),
lastDataBlockOffset, onDiskSize);
totalUncompressedBytes += fsBlockWriter.getUncompressedSizeWithHeader();
if (cacheConf.shouldCacheDataOnWrite()) {
doCacheOnWrite(lastDataBlockOffset);
}
}
/** Gives inline block writers an opportunity to contribute blocks. */
private void writeInlineBlocks(boolean closing) throws IOException {
for (InlineBlockWriter ibw : inlineBlockWriters) {
while (ibw.shouldWriteBlock(closing)) {
long offset = outputStream.getPos();
boolean cacheThisBlock = ibw.getCacheOnWrite();
ibw.writeInlineBlock(fsBlockWriter.startWriting(
ibw.getInlineBlockType()));
fsBlockWriter.writeHeaderAndData(outputStream);
ibw.blockWritten(offset, fsBlockWriter.getOnDiskSizeWithHeader(),
fsBlockWriter.getUncompressedSizeWithoutHeader());
totalUncompressedBytes += fsBlockWriter.getUncompressedSizeWithHeader();
if (cacheThisBlock) {
doCacheOnWrite(offset);
}
}
}
}
/**
* Caches the last written HFile block.
* @param offset the offset of the block we want to cache. Used to determine
* the cache key.
*/
private void doCacheOnWrite(long offset) {
HFileBlock cacheFormatBlock = fsBlockWriter.getBlockForCaching(cacheConf);
cacheConf.getBlockCache().cacheBlock(
new BlockCacheKey(name, offset), cacheFormatBlock);
}
/**
* Ready a new block for writing.
*
* @throws IOException
*/
protected void newBlock() throws IOException {
// This is where the next block begins.
fsBlockWriter.startWriting(BlockType.DATA);
firstCellInBlock = null;
if (lastCell != null) {
lastCellOfPreviousBlock = lastCell;
}
}
/**
* Add a meta block to the end of the file. Call before close(). Metadata
* blocks are expensive. Fill one with a bunch of serialized data rather than
* do a metadata block per metadata instance. If metadata is small, consider
* adding to file info using {@link #appendFileInfo(byte[], byte[])}
*
* @param metaBlockName
* name of the block
* @param content
* will call readFields to get data later (DO NOT REUSE)
*/
@Override
public void appendMetaBlock(String metaBlockName, Writable content) {
byte[] key = Bytes.toBytes(metaBlockName);
int i;
for (i = 0; i < metaNames.size(); ++i) {
// stop when the current key is greater than our own
byte[] cur = metaNames.get(i);
if (Bytes.BYTES_RAWCOMPARATOR.compare(cur, 0, cur.length, key, 0,
key.length) > 0) {
break;
}
}
metaNames.add(i, key);
metaData.add(i, content);
}
/**
* Add key/value to file. Keys must be added in an order that agrees with the
* Comparator passed on construction.
*
* @param cell Cell to add. Cannot be empty nor null.
* @throws IOException
*/
@Override
public void append(final Cell cell) throws IOException {
byte[] value = cell.getValueArray();
int voffset = cell.getValueOffset();
int vlength = cell.getValueLength();
// checkKey uses comparator to check we are writing in order.
boolean dupKey = checkKey(cell);
checkValue(value, voffset, vlength);
if (!dupKey) {
checkBlockBoundary();
}
if (!fsBlockWriter.isWriting()) {
newBlock();
}
fsBlockWriter.write(cell);
totalKeyLength += CellUtil.estimatedSerializedSizeOfKey(cell);
totalValueLength += vlength;
// Are we the first key in this block?
if (firstCellInBlock == null) {
// If cell is big, block will be closed and this firstCellInBlock reference will only last
// a short while.
firstCellInBlock = cell;
}
// TODO: What if cell is 10MB and we write infrequently? We'll hold on to the cell here
// indefinetly?
lastCell = cell;
entryCount++;
this.maxMemstoreTS = Math.max(this.maxMemstoreTS, cell.getSequenceId());
}
@Override
public void close() throws IOException {
if (outputStream == null) {
return;
}
// Save data block encoder metadata in the file info.
blockEncoder.saveMetadata(this);
// Write out the end of the data blocks, then write meta data blocks.
// followed by fileinfo, data block index and meta block index.
finishBlock();
writeInlineBlocks(true);
FixedFileTrailer trailer = new FixedFileTrailer(getMajorVersion(), getMinorVersion());
// Write out the metadata blocks if any.
if (!metaNames.isEmpty()) {
for (int i = 0; i < metaNames.size(); ++i) {
// store the beginning offset
long offset = outputStream.getPos();
// write the metadata content
DataOutputStream dos = fsBlockWriter.startWriting(BlockType.META);
metaData.get(i).write(dos);
fsBlockWriter.writeHeaderAndData(outputStream);
totalUncompressedBytes += fsBlockWriter.getUncompressedSizeWithHeader();
// Add the new meta block to the meta index.
metaBlockIndexWriter.addEntry(metaNames.get(i), offset,
fsBlockWriter.getOnDiskSizeWithHeader());
}
}
// Load-on-open section.
// Data block index.
//
// In version 2, this section of the file starts with the root level data
// block index. We call a function that writes intermediate-level blocks
// first, then root level, and returns the offset of the root level block
// index.
long rootIndexOffset = dataBlockIndexWriter.writeIndexBlocks(outputStream);
trailer.setLoadOnOpenOffset(rootIndexOffset);
// Meta block index.
metaBlockIndexWriter.writeSingleLevelIndex(fsBlockWriter.startWriting(
BlockType.ROOT_INDEX), "meta");
fsBlockWriter.writeHeaderAndData(outputStream);
totalUncompressedBytes += fsBlockWriter.getUncompressedSizeWithHeader();
if (this.hFileContext.isIncludesMvcc()) {
appendFileInfo(MAX_MEMSTORE_TS_KEY, Bytes.toBytes(maxMemstoreTS));
appendFileInfo(KEY_VALUE_VERSION, Bytes.toBytes(KEY_VALUE_VER_WITH_MEMSTORE));
}
// File info
writeFileInfo(trailer, fsBlockWriter.startWriting(BlockType.FILE_INFO));
fsBlockWriter.writeHeaderAndData(outputStream);
totalUncompressedBytes += fsBlockWriter.getUncompressedSizeWithHeader();
// Load-on-open data supplied by higher levels, e.g. Bloom filters.
for (BlockWritable w : additionalLoadOnOpenData){
fsBlockWriter.writeBlock(w, outputStream);
totalUncompressedBytes += fsBlockWriter.getUncompressedSizeWithHeader();
}
// Now finish off the trailer.
trailer.setNumDataIndexLevels(dataBlockIndexWriter.getNumLevels());
trailer.setUncompressedDataIndexSize(
dataBlockIndexWriter.getTotalUncompressedSize());
trailer.setFirstDataBlockOffset(firstDataBlockOffset);
trailer.setLastDataBlockOffset(lastDataBlockOffset);
trailer.setComparatorClass(comparator.getClass());
trailer.setDataIndexCount(dataBlockIndexWriter.getNumRootEntries());
finishClose(trailer);
fsBlockWriter.release();
}
@Override
public void addInlineBlockWriter(InlineBlockWriter ibw) {
inlineBlockWriters.add(ibw);
}
@Override
public void addGeneralBloomFilter(final BloomFilterWriter bfw) {
this.addBloomFilter(bfw, BlockType.GENERAL_BLOOM_META);
}
@Override
public void addDeleteFamilyBloomFilter(final BloomFilterWriter bfw) {
this.addBloomFilter(bfw, BlockType.DELETE_FAMILY_BLOOM_META);
}
private void addBloomFilter(final BloomFilterWriter bfw,
final BlockType blockType) {
if (bfw.getKeyCount() <= 0)
return;
if (blockType != BlockType.GENERAL_BLOOM_META &&
blockType != BlockType.DELETE_FAMILY_BLOOM_META) {
throw new RuntimeException("Block Type: " + blockType.toString() +
"is not supported");
}
additionalLoadOnOpenData.add(new BlockWritable() {
@Override
public BlockType getBlockType() {
return blockType;
}
@Override
public void writeToBlock(DataOutput out) throws IOException {
bfw.getMetaWriter().write(out);
Writable dataWriter = bfw.getDataWriter();
if (dataWriter != null)
dataWriter.write(out);
}
});
}
protected int getMajorVersion() {
return 2;
}
protected int getMinorVersion() {
return HFileReaderV2.MAX_MINOR_VERSION;
}
@Override
public HFileContext getFileContext() {
return hFileContext;
}
}