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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.hudi.common.util.collection;
import org.apache.hudi.common.util.FileIOUtils;
import org.apache.hudi.common.util.HoodieTimer;
import org.apache.hudi.common.util.SerializationUtils;
import org.apache.hudi.common.util.ValidationUtils;
import org.apache.hudi.exception.HoodieException;
import org.apache.hudi.exception.HoodieIOException;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.rocksdb.AbstractImmutableNativeReference;
import org.rocksdb.ColumnFamilyDescriptor;
import org.rocksdb.ColumnFamilyHandle;
import org.rocksdb.ColumnFamilyOptions;
import org.rocksdb.DBOptions;
import org.rocksdb.InfoLogLevel;
import org.rocksdb.Options;
import org.rocksdb.RocksDB;
import org.rocksdb.RocksDBException;
import org.rocksdb.RocksIterator;
import org.rocksdb.Statistics;
import org.rocksdb.WriteBatch;
import org.rocksdb.WriteOptions;
import java.io.File;
import java.io.IOException;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* Data access objects for storing and retrieving objects in Rocks DB.
*/
public class RocksDBDAO {
private static final Logger LOG = LogManager.getLogger(RocksDBDAO.class);
private transient ConcurrentHashMap managedHandlesMap;
private transient ConcurrentHashMap managedDescriptorMap;
private transient RocksDB rocksDB;
private boolean closed = false;
private final String rocksDBBasePath;
private long totalBytesWritten;
public RocksDBDAO(String basePath, String rocksDBBasePath) {
this.rocksDBBasePath =
String.format("%s/%s/%s", rocksDBBasePath, basePath.replace("/", "_"), UUID.randomUUID().toString());
init();
totalBytesWritten = 0L;
}
/**
* Create RocksDB if not initialized.
*/
private RocksDB getRocksDB() {
return rocksDB;
}
/**
* Initialized Rocks DB instance.
*/
private void init() {
try {
LOG.info("DELETING RocksDB persisted at " + rocksDBBasePath);
FileIOUtils.deleteDirectory(new File(rocksDBBasePath));
managedHandlesMap = new ConcurrentHashMap<>();
managedDescriptorMap = new ConcurrentHashMap<>();
// If already present, loads the existing column-family handles
final DBOptions dbOptions = new DBOptions().setCreateIfMissing(true).setCreateMissingColumnFamilies(true)
.setWalDir(rocksDBBasePath).setStatsDumpPeriodSec(300).setStatistics(new Statistics());
dbOptions.setLogger(new org.rocksdb.Logger(dbOptions) {
@Override
protected void log(InfoLogLevel infoLogLevel, String logMsg) {
LOG.info("From Rocks DB : " + logMsg);
}
});
final List managedColumnFamilies = loadManagedColumnFamilies(dbOptions);
final List managedHandles = new ArrayList<>();
FileIOUtils.mkdir(new File(rocksDBBasePath));
rocksDB = RocksDB.open(dbOptions, rocksDBBasePath, managedColumnFamilies, managedHandles);
ValidationUtils.checkArgument(managedHandles.size() == managedColumnFamilies.size(),
"Unexpected number of handles are returned");
for (int index = 0; index < managedHandles.size(); index++) {
ColumnFamilyHandle handle = managedHandles.get(index);
ColumnFamilyDescriptor descriptor = managedColumnFamilies.get(index);
String familyNameFromHandle = new String(handle.getName());
String familyNameFromDescriptor = new String(descriptor.getName());
ValidationUtils.checkArgument(familyNameFromDescriptor.equals(familyNameFromHandle),
"Family Handles not in order with descriptors");
managedHandlesMap.put(familyNameFromHandle, handle);
managedDescriptorMap.put(familyNameFromDescriptor, descriptor);
}
} catch (RocksDBException | IOException re) {
LOG.error("Got exception opening Rocks DB instance ", re);
throw new HoodieException(re);
}
}
/**
* Helper to load managed column family descriptors.
*/
private List loadManagedColumnFamilies(DBOptions dbOptions) throws RocksDBException {
final List managedColumnFamilies = new ArrayList<>();
final Options options = new Options(dbOptions, new ColumnFamilyOptions());
List existing = RocksDB.listColumnFamilies(options, rocksDBBasePath);
if (existing.isEmpty()) {
LOG.info("No column family found. Loading default");
managedColumnFamilies.add(getColumnFamilyDescriptor(RocksDB.DEFAULT_COLUMN_FAMILY));
} else {
LOG.info("Loading column families :" + existing.stream().map(String::new).collect(Collectors.toList()));
managedColumnFamilies
.addAll(existing.stream().map(RocksDBDAO::getColumnFamilyDescriptor).collect(Collectors.toList()));
}
return managedColumnFamilies;
}
private static ColumnFamilyDescriptor getColumnFamilyDescriptor(byte[] columnFamilyName) {
return new ColumnFamilyDescriptor(columnFamilyName, new ColumnFamilyOptions());
}
/**
* Perform a batch write operation.
*/
public void writeBatch(BatchHandler handler) {
try (WriteBatch batch = new WriteBatch()) {
handler.apply(batch);
getRocksDB().write(new WriteOptions(), batch);
} catch (RocksDBException re) {
throw new HoodieException(re);
}
}
/**
* Helper to add put operation in batch.
*
* @param batch Batch Handle
* @param columnFamilyName Column Family
* @param key Key
* @param value Payload
* @param Type of payload
*/
public void putInBatch(WriteBatch batch, String columnFamilyName, String key, T value) {
try {
byte[] payload = serializePayload(value);
batch.put(managedHandlesMap.get(columnFamilyName), key.getBytes(), payload);
} catch (Exception e) {
throw new HoodieException(e);
}
}
/**
* Helper to add put operation in batch.
*
* @param batch Batch Handle
* @param columnFamilyName Column Family
* @param key Key
* @param value Payload
* @param Type of payload
*/
public void putInBatch(WriteBatch batch, String columnFamilyName,
K key, T value) {
try {
byte[] keyBytes = SerializationUtils.serialize(key);
byte[] payload = serializePayload(value);
batch.put(managedHandlesMap.get(columnFamilyName), keyBytes, payload);
} catch (Exception e) {
throw new HoodieException(e);
}
}
/**
* Perform single PUT on a column-family.
*
* @param columnFamilyName Column family name
* @param key Key
* @param value Payload
* @param Type of Payload
*/
public void put(String columnFamilyName, String key, T value) {
try {
byte[] payload = serializePayload(value);
getRocksDB().put(managedHandlesMap.get(columnFamilyName), key.getBytes(), payload);
} catch (Exception e) {
throw new HoodieException(e);
}
}
/**
* Perform single PUT on a column-family.
*
* @param columnFamilyName Column family name
* @param key Key
* @param value Payload
* @param Type of Payload
*/
public void put(String columnFamilyName, K key, T value) {
try {
byte[] payload = serializePayload(value);
getRocksDB().put(managedHandlesMap.get(columnFamilyName), SerializationUtils.serialize(key), payload);
} catch (Exception e) {
throw new HoodieException(e);
}
}
/**
* Helper to add delete operation in batch.
*
* @param batch Batch Handle
* @param columnFamilyName Column Family
* @param key Key
*/
public void deleteInBatch(WriteBatch batch, String columnFamilyName, String key) {
try {
batch.delete(managedHandlesMap.get(columnFamilyName), key.getBytes());
} catch (RocksDBException e) {
throw new HoodieException(e);
}
}
/**
* Helper to add delete operation in batch.
*
* @param batch Batch Handle
* @param columnFamilyName Column Family
* @param key Key
*/
public void deleteInBatch(WriteBatch batch, String columnFamilyName, K key) {
try {
batch.delete(managedHandlesMap.get(columnFamilyName), SerializationUtils.serialize(key));
} catch (Exception e) {
throw new HoodieException(e);
}
}
/**
* Perform a single Delete operation.
*
* @param columnFamilyName Column Family name
* @param key Key to be deleted
*/
public void delete(String columnFamilyName, String key) {
try {
getRocksDB().delete(managedHandlesMap.get(columnFamilyName), key.getBytes());
} catch (RocksDBException e) {
throw new HoodieException(e);
}
}
/**
* Perform a single Delete operation.
*
* @param columnFamilyName Column Family name
* @param key Key to be deleted
*/
public void delete(String columnFamilyName, K key) {
try {
getRocksDB().delete(managedHandlesMap.get(columnFamilyName), SerializationUtils.serialize(key));
} catch (Exception e) {
throw new HoodieException(e);
}
}
/**
* Retrieve a value for a given key in a column family.
*
* @param columnFamilyName Column Family Name
* @param key Key to be retrieved
* @param Type of object stored.
*/
public T get(String columnFamilyName, String key) {
ValidationUtils.checkArgument(!closed);
try {
byte[] val = getRocksDB().get(managedHandlesMap.get(columnFamilyName), key.getBytes());
return val == null ? null : SerializationUtils.deserialize(val);
} catch (RocksDBException e) {
throw new HoodieException(e);
}
}
/**
* Retrieve a value for a given key in a column family.
*
* @param columnFamilyName Column Family Name
* @param key Key to be retrieved
* @param Type of object stored.
*/
public T get(String columnFamilyName, K key) {
ValidationUtils.checkArgument(!closed);
try {
byte[] val = getRocksDB().get(managedHandlesMap.get(columnFamilyName), SerializationUtils.serialize(key));
return val == null ? null : SerializationUtils.deserialize(val);
} catch (Exception e) {
throw new HoodieException(e);
}
}
/**
* Perform a prefix search and return stream of key-value pairs retrieved.
*
* @param columnFamilyName Column Family Name
* @param prefix Prefix Key
* @param Type of value stored
*/
public Stream> prefixSearch(String columnFamilyName, String prefix) {
ValidationUtils.checkArgument(!closed);
final HoodieTimer timer = HoodieTimer.start();
long timeTakenMicro = 0;
List> results = new LinkedList<>();
try (final RocksIterator it = getRocksDB().newIterator(managedHandlesMap.get(columnFamilyName))) {
it.seek(prefix.getBytes());
while (it.isValid() && new String(it.key()).startsWith(prefix)) {
long beginTs = System.nanoTime();
T val = SerializationUtils.deserialize(it.value());
timeTakenMicro += ((System.nanoTime() - beginTs) / 1000);
results.add(Pair.of(new String(it.key()), val));
it.next();
}
}
LOG.info("Prefix Search for (query=" + prefix + ") on " + columnFamilyName + ". Total Time Taken (msec)="
+ timer.endTimer() + ". Serialization Time taken(micro)=" + timeTakenMicro + ", num entries=" + results.size());
return results.stream();
}
/**
* Return Iterator of key-value pairs from RocksIterator.
*
* @param columnFamilyName Column Family Name
* @param Type of value stored
*/
public Iterator iterator(String columnFamilyName) {
return new IteratorWrapper<>(getRocksDB().newIterator(managedHandlesMap.get(columnFamilyName)));
}
/**
* Perform a prefix delete and return stream of key-value pairs retrieved.
*
* @param columnFamilyName Column Family Name
* @param prefix Prefix Key
* @param Type of value stored
*/
public void prefixDelete(String columnFamilyName, String prefix) {
ValidationUtils.checkArgument(!closed);
LOG.info("Prefix DELETE (query=" + prefix + ") on " + columnFamilyName);
final RocksIterator it = getRocksDB().newIterator(managedHandlesMap.get(columnFamilyName));
it.seek(prefix.getBytes());
// Find first and last keys to be deleted
String firstEntry = null;
String lastEntry = null;
while (it.isValid() && new String(it.key()).startsWith(prefix)) {
String result = new String(it.key());
it.next();
if (firstEntry == null) {
firstEntry = result;
}
lastEntry = result;
}
it.close();
if (null != firstEntry) {
try {
// This will not delete the last entry
getRocksDB().deleteRange(managedHandlesMap.get(columnFamilyName), firstEntry.getBytes(), lastEntry.getBytes());
// Delete the last entry
getRocksDB().delete(lastEntry.getBytes());
} catch (RocksDBException e) {
LOG.error("Got exception performing range delete");
throw new HoodieException(e);
}
}
}
/**
* Add a new column family to store.
*
* @param columnFamilyName Column family name
*/
public void addColumnFamily(String columnFamilyName) {
ValidationUtils.checkArgument(!closed);
managedDescriptorMap.computeIfAbsent(columnFamilyName, colFamilyName -> {
try {
ColumnFamilyDescriptor descriptor = getColumnFamilyDescriptor(colFamilyName.getBytes());
ColumnFamilyHandle handle = getRocksDB().createColumnFamily(descriptor);
managedHandlesMap.put(colFamilyName, handle);
return descriptor;
} catch (RocksDBException e) {
throw new HoodieException(e);
}
});
}
/**
* Note : Does not delete from underlying DB. Just closes the handle.
*
* @param columnFamilyName Column Family Name
*/
public void dropColumnFamily(String columnFamilyName) {
ValidationUtils.checkArgument(!closed);
managedDescriptorMap.computeIfPresent(columnFamilyName, (colFamilyName, descriptor) -> {
ColumnFamilyHandle handle = managedHandlesMap.get(colFamilyName);
try {
getRocksDB().dropColumnFamily(handle);
handle.close();
} catch (RocksDBException e) {
throw new HoodieException(e);
}
managedHandlesMap.remove(columnFamilyName);
return null;
});
}
/**
* Close the DAO object.
*/
public synchronized void close() {
if (!closed) {
closed = true;
managedHandlesMap.values().forEach(AbstractImmutableNativeReference::close);
managedHandlesMap.clear();
managedDescriptorMap.clear();
getRocksDB().close();
try {
FileIOUtils.deleteDirectory(new File(rocksDBBasePath));
} catch (IOException e) {
throw new HoodieIOException(e.getMessage(), e);
}
}
}
public long getTotalBytesWritten() {
return totalBytesWritten;
}
private byte[] serializePayload(T value) throws IOException {
byte[] payload = SerializationUtils.serialize(value);
totalBytesWritten += payload.length;
return payload;
}
String getRocksDBBasePath() {
return rocksDBBasePath;
}
/**
* {@link Iterator} wrapper for RocksDb Iterator {@link RocksIterator}.
*/
private static class IteratorWrapper implements Iterator {
private final RocksIterator iterator;
public IteratorWrapper(final RocksIterator iterator) {
this.iterator = iterator;
iterator.seekToFirst();
}
@Override
public boolean hasNext() {
return iterator.isValid();
}
@Override
public R next() {
if (!hasNext()) {
throw new IllegalStateException("next() called on rocksDB with no more valid entries");
}
R val = SerializationUtils.deserialize(iterator.value());
iterator.next();
return val;
}
}
/**
* Functional interface for stacking operation to Write batch.
*/
public interface BatchHandler {
void apply(WriteBatch batch);
}
}
