kafka RocksDBStore 源码
kafka RocksDBStore 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/state/internals/RocksDBStore.java
/*
* 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.kafka.streams.state.internals;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.common.metrics.Sensor.RecordingLevel;
import org.apache.kafka.common.serialization.Serializer;
import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.common.utils.Utils;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.StreamsConfig;
import org.apache.kafka.streams.errors.InvalidStateStoreException;
import org.apache.kafka.streams.errors.ProcessorStateException;
import org.apache.kafka.streams.processor.ProcessorContext;
import org.apache.kafka.streams.processor.StateStore;
import org.apache.kafka.streams.processor.StateStoreContext;
import org.apache.kafka.streams.processor.internals.ChangelogRecordDeserializationHelper;
import org.apache.kafka.streams.processor.internals.RecordBatchingStateRestoreCallback;
import org.apache.kafka.streams.query.Position;
import org.apache.kafka.streams.query.PositionBound;
import org.apache.kafka.streams.query.Query;
import org.apache.kafka.streams.query.QueryConfig;
import org.apache.kafka.streams.query.QueryResult;
import org.apache.kafka.streams.state.KeyValueIterator;
import org.apache.kafka.streams.state.KeyValueStore;
import org.apache.kafka.streams.state.RocksDBConfigSetter;
import org.apache.kafka.streams.state.internals.metrics.RocksDBMetricsRecorder;
import org.rocksdb.BlockBasedTableConfig;
import org.rocksdb.BloomFilter;
import org.rocksdb.Cache;
import org.rocksdb.ColumnFamilyDescriptor;
import org.rocksdb.ColumnFamilyHandle;
import org.rocksdb.ColumnFamilyOptions;
import org.rocksdb.CompactionStyle;
import org.rocksdb.CompressionType;
import org.rocksdb.DBOptions;
import org.rocksdb.FlushOptions;
import org.rocksdb.InfoLogLevel;
import org.rocksdb.LRUCache;
import org.rocksdb.Options;
import org.rocksdb.RocksDB;
import org.rocksdb.RocksDBException;
import org.rocksdb.RocksIterator;
import org.rocksdb.Statistics;
import org.rocksdb.TableFormatConfig;
import org.rocksdb.WriteBatch;
import org.rocksdb.WriteOptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import static org.apache.kafka.streams.StreamsConfig.InternalConfig.IQ_CONSISTENCY_OFFSET_VECTOR_ENABLED;
import static org.apache.kafka.streams.StreamsConfig.METRICS_RECORDING_LEVEL_CONFIG;
import static org.apache.kafka.streams.processor.internals.ProcessorContextUtils.getMetricsImpl;
/**
* A persistent key-value store based on RocksDB.
*/
public class RocksDBStore implements KeyValueStore<Bytes, byte[]>, BatchWritingStore {
private static final Logger log = LoggerFactory.getLogger(RocksDBStore.class);
private static final CompressionType COMPRESSION_TYPE = CompressionType.NO_COMPRESSION;
private static final CompactionStyle COMPACTION_STYLE = CompactionStyle.UNIVERSAL;
private static final long WRITE_BUFFER_SIZE = 16 * 1024 * 1024L;
private static final long BLOCK_CACHE_SIZE = 50 * 1024 * 1024L;
private static final long BLOCK_SIZE = 4096L;
private static final int MAX_WRITE_BUFFERS = 3;
private static final String DB_FILE_DIR = "rocksdb";
final String name;
private final String parentDir;
final Set<KeyValueIterator<Bytes, byte[]>> openIterators = Collections.synchronizedSet(new HashSet<>());
private boolean consistencyEnabled = false;
// VisibleForTesting
protected File dbDir;
RocksDB db;
RocksDBAccessor dbAccessor;
// the following option objects will be created in openDB and closed in the close() method
private RocksDBGenericOptionsToDbOptionsColumnFamilyOptionsAdapter userSpecifiedOptions;
WriteOptions wOptions;
FlushOptions fOptions;
private Cache cache;
private BloomFilter filter;
private RocksDBConfigSetter configSetter;
private boolean userSpecifiedStatistics = false;
private final RocksDBMetricsRecorder metricsRecorder;
protected volatile boolean open = false;
protected StateStoreContext context;
protected Position position;
private OffsetCheckpoint positionCheckpoint;
// VisibleForTesting
public RocksDBStore(final String name,
final String metricsScope) {
this(name, DB_FILE_DIR, new RocksDBMetricsRecorder(metricsScope, name));
}
RocksDBStore(final String name,
final String parentDir,
final RocksDBMetricsRecorder metricsRecorder) {
this.name = name;
this.parentDir = parentDir;
this.metricsRecorder = metricsRecorder;
}
@Deprecated
@Override
public void init(final ProcessorContext context,
final StateStore root) {
if (context instanceof StateStoreContext) {
init((StateStoreContext) context, root);
} else {
throw new UnsupportedOperationException(
"Use RocksDBStore#init(StateStoreContext, StateStore) instead."
);
}
}
@Override
public void init(final StateStoreContext context,
final StateStore root) {
// open the DB dir
metricsRecorder.init(getMetricsImpl(context), context.taskId());
openDB(context.appConfigs(), context.stateDir());
final File positionCheckpointFile = new File(context.stateDir(), name() + ".position");
this.positionCheckpoint = new OffsetCheckpoint(positionCheckpointFile);
this.position = StoreQueryUtils.readPositionFromCheckpoint(positionCheckpoint);
// value getter should always read directly from rocksDB
// since it is only for values that are already flushed
this.context = context;
context.register(
root,
(RecordBatchingStateRestoreCallback) this::restoreBatch,
() -> StoreQueryUtils.checkpointPosition(positionCheckpoint, position)
);
consistencyEnabled = StreamsConfig.InternalConfig.getBoolean(
context.appConfigs(),
IQ_CONSISTENCY_OFFSET_VECTOR_ENABLED,
false);
}
@SuppressWarnings("unchecked")
void openDB(final Map<String, Object> configs, final File stateDir) {
// initialize the default rocksdb options
final DBOptions dbOptions = new DBOptions();
final ColumnFamilyOptions columnFamilyOptions = new ColumnFamilyOptions();
userSpecifiedOptions = new RocksDBGenericOptionsToDbOptionsColumnFamilyOptionsAdapter(dbOptions, columnFamilyOptions);
final BlockBasedTableConfigWithAccessibleCache tableConfig = new BlockBasedTableConfigWithAccessibleCache();
cache = new LRUCache(BLOCK_CACHE_SIZE);
tableConfig.setBlockCache(cache);
tableConfig.setBlockSize(BLOCK_SIZE);
filter = new BloomFilter();
tableConfig.setFilterPolicy(filter);
userSpecifiedOptions.optimizeFiltersForHits();
userSpecifiedOptions.setTableFormatConfig(tableConfig);
userSpecifiedOptions.setWriteBufferSize(WRITE_BUFFER_SIZE);
userSpecifiedOptions.setCompressionType(COMPRESSION_TYPE);
userSpecifiedOptions.setCompactionStyle(COMPACTION_STYLE);
userSpecifiedOptions.setMaxWriteBufferNumber(MAX_WRITE_BUFFERS);
userSpecifiedOptions.setCreateIfMissing(true);
userSpecifiedOptions.setErrorIfExists(false);
userSpecifiedOptions.setInfoLogLevel(InfoLogLevel.ERROR_LEVEL);
// this is the recommended way to increase parallelism in RocksDb
// note that the current implementation of setIncreaseParallelism affects the number
// of compaction threads but not flush threads (the latter remains one). Also,
// the parallelism value needs to be at least two because of the code in
// https://github.com/facebook/rocksdb/blob/62ad0a9b19f0be4cefa70b6b32876e764b7f3c11/util/options.cc#L580
// subtracts one from the value passed to determine the number of compaction threads
// (this could be a bug in the RocksDB code and their devs have been contacted).
userSpecifiedOptions.setIncreaseParallelism(Math.max(Runtime.getRuntime().availableProcessors(), 2));
wOptions = new WriteOptions();
wOptions.setDisableWAL(true);
fOptions = new FlushOptions();
fOptions.setWaitForFlush(true);
final Class<RocksDBConfigSetter> configSetterClass =
(Class<RocksDBConfigSetter>) configs.get(StreamsConfig.ROCKSDB_CONFIG_SETTER_CLASS_CONFIG);
if (configSetterClass != null) {
configSetter = Utils.newInstance(configSetterClass);
configSetter.setConfig(name, userSpecifiedOptions, configs);
}
dbDir = new File(new File(stateDir, parentDir), name);
try {
Files.createDirectories(dbDir.getParentFile().toPath());
Files.createDirectories(dbDir.getAbsoluteFile().toPath());
} catch (final IOException fatal) {
throw new ProcessorStateException(fatal);
}
// Setup statistics before the database is opened, otherwise the statistics are not updated
// with the measurements from Rocks DB
maybeSetUpStatistics(configs);
openRocksDB(dbOptions, columnFamilyOptions);
open = true;
addValueProvidersToMetricsRecorder();
}
private void maybeSetUpStatistics(final Map<String, Object> configs) {
if (userSpecifiedOptions.statistics() != null) {
userSpecifiedStatistics = true;
}
if (!userSpecifiedStatistics &&
RecordingLevel.forName((String) configs.get(METRICS_RECORDING_LEVEL_CONFIG)) == RecordingLevel.DEBUG) {
// metrics recorder will clean up statistics object
final Statistics statistics = new Statistics();
userSpecifiedOptions.setStatistics(statistics);
}
}
private void addValueProvidersToMetricsRecorder() {
final TableFormatConfig tableFormatConfig = userSpecifiedOptions.tableFormatConfig();
final Statistics statistics = userSpecifiedStatistics ? null : userSpecifiedOptions.statistics();
if (tableFormatConfig instanceof BlockBasedTableConfigWithAccessibleCache) {
final Cache cache = ((BlockBasedTableConfigWithAccessibleCache) tableFormatConfig).blockCache();
metricsRecorder.addValueProviders(name, db, cache, statistics);
} else if (tableFormatConfig instanceof BlockBasedTableConfig) {
throw new ProcessorStateException("The used block-based table format configuration does not expose the " +
"block cache. Use the BlockBasedTableConfig instance provided by Options#tableFormatConfig() to configure " +
"the block-based table format of RocksDB. Do not provide a new instance of BlockBasedTableConfig to " +
"the RocksDB options.");
} else {
metricsRecorder.addValueProviders(name, db, null, statistics);
}
}
void openRocksDB(final DBOptions dbOptions,
final ColumnFamilyOptions columnFamilyOptions) {
final List<ColumnFamilyDescriptor> columnFamilyDescriptors
= Collections.singletonList(new ColumnFamilyDescriptor(RocksDB.DEFAULT_COLUMN_FAMILY, columnFamilyOptions));
final List<ColumnFamilyHandle> columnFamilies = new ArrayList<>(columnFamilyDescriptors.size());
try {
db = RocksDB.open(dbOptions, dbDir.getAbsolutePath(), columnFamilyDescriptors, columnFamilies);
dbAccessor = new SingleColumnFamilyAccessor(columnFamilies.get(0));
} catch (final RocksDBException e) {
throw new ProcessorStateException("Error opening store " + name + " at location " + dbDir.toString(), e);
}
}
@Override
public String name() {
return name;
}
@Override
public boolean persistent() {
return true;
}
@Override
public boolean isOpen() {
return open;
}
private void validateStoreOpen() {
if (!open) {
throw new InvalidStateStoreException("Store " + name + " is currently closed");
}
}
@Override
public synchronized void put(final Bytes key,
final byte[] value) {
Objects.requireNonNull(key, "key cannot be null");
validateStoreOpen();
dbAccessor.put(key.get(), value);
StoreQueryUtils.updatePosition(position, context);
}
@Override
public synchronized byte[] putIfAbsent(final Bytes key,
final byte[] value) {
Objects.requireNonNull(key, "key cannot be null");
final byte[] originalValue = get(key);
if (originalValue == null) {
put(key, value);
}
return originalValue;
}
@Override
public void putAll(final List<KeyValue<Bytes, byte[]>> entries) {
try (final WriteBatch batch = new WriteBatch()) {
dbAccessor.prepareBatch(entries, batch);
write(batch);
StoreQueryUtils.updatePosition(position, context);
} catch (final RocksDBException e) {
throw new ProcessorStateException("Error while batch writing to store " + name, e);
}
}
@Override
public <R> QueryResult<R> query(
final Query<R> query,
final PositionBound positionBound,
final QueryConfig config) {
return StoreQueryUtils.handleBasicQueries(
query,
positionBound,
config,
this,
position,
context
);
}
@Override
public <PS extends Serializer<P>, P> KeyValueIterator<Bytes, byte[]> prefixScan(final P prefix,
final PS prefixKeySerializer) {
validateStoreOpen();
Objects.requireNonNull(prefix, "prefix cannot be null");
Objects.requireNonNull(prefixKeySerializer, "prefixKeySerializer cannot be null");
final Bytes prefixBytes = Bytes.wrap(prefixKeySerializer.serialize(null, prefix));
final KeyValueIterator<Bytes, byte[]> rocksDbPrefixSeekIterator = dbAccessor.prefixScan(prefixBytes);
openIterators.add(rocksDbPrefixSeekIterator);
return rocksDbPrefixSeekIterator;
}
@Override
public synchronized byte[] get(final Bytes key) {
validateStoreOpen();
try {
return dbAccessor.get(key.get());
} catch (final RocksDBException e) {
// String format is happening in wrapping stores. So formatted message is thrown from wrapping stores.
throw new ProcessorStateException("Error while getting value for key from store " + name, e);
}
}
@Override
public synchronized byte[] delete(final Bytes key) {
Objects.requireNonNull(key, "key cannot be null");
final byte[] oldValue;
try {
oldValue = dbAccessor.getOnly(key.get());
} catch (final RocksDBException e) {
// String format is happening in wrapping stores. So formatted message is thrown from wrapping stores.
throw new ProcessorStateException("Error while getting value for key from store " + name, e);
}
put(key, null);
return oldValue;
}
void deleteRange(final Bytes keyFrom, final Bytes keyTo) {
Objects.requireNonNull(keyFrom, "keyFrom cannot be null");
Objects.requireNonNull(keyTo, "keyTo cannot be null");
validateStoreOpen();
// End of key is exclusive, so we increment it by 1 byte to make keyTo inclusive
dbAccessor.deleteRange(keyFrom.get(), Bytes.increment(keyTo).get());
}
@Override
public synchronized KeyValueIterator<Bytes, byte[]> range(final Bytes from,
final Bytes to) {
return range(from, to, true);
}
@Override
public synchronized KeyValueIterator<Bytes, byte[]> reverseRange(final Bytes from,
final Bytes to) {
return range(from, to, false);
}
KeyValueIterator<Bytes, byte[]> range(final Bytes from,
final Bytes to,
final boolean forward) {
if (Objects.nonNull(from) && Objects.nonNull(to) && from.compareTo(to) > 0) {
log.warn("Returning empty iterator for fetch with invalid key range: from > to. "
+ "This may be due to range arguments set in the wrong order, " +
"or serdes that don't preserve ordering when lexicographically comparing the serialized bytes. " +
"Note that the built-in numerical serdes do not follow this for negative numbers");
return KeyValueIterators.emptyIterator();
}
validateStoreOpen();
final KeyValueIterator<Bytes, byte[]> rocksDBRangeIterator = dbAccessor.range(from, to, forward);
openIterators.add(rocksDBRangeIterator);
return rocksDBRangeIterator;
}
@Override
public synchronized KeyValueIterator<Bytes, byte[]> all() {
return all(true);
}
@Override
public KeyValueIterator<Bytes, byte[]> reverseAll() {
return all(false);
}
KeyValueIterator<Bytes, byte[]> all(final boolean forward) {
validateStoreOpen();
final KeyValueIterator<Bytes, byte[]> rocksDbIterator = dbAccessor.all(forward);
openIterators.add(rocksDbIterator);
return rocksDbIterator;
}
/**
* Return an approximate count of key-value mappings in this store.
*
* <code>RocksDB</code> cannot return an exact entry count without doing a
* full scan, so this method relies on the <code>rocksdb.estimate-num-keys</code>
* property to get an approximate count. The returned size also includes
* a count of dirty keys in the store's in-memory cache, which may lead to some
* double-counting of entries and inflate the estimate.
*
* @return an approximate count of key-value mappings in the store.
*/
@Override
public long approximateNumEntries() {
validateStoreOpen();
final long numEntries;
try {
numEntries = dbAccessor.approximateNumEntries();
} catch (final RocksDBException e) {
throw new ProcessorStateException("Error fetching property from store " + name, e);
}
if (isOverflowing(numEntries)) {
return Long.MAX_VALUE;
}
return numEntries;
}
private boolean isOverflowing(final long value) {
// RocksDB returns an unsigned 8-byte integer, which could overflow long
// and manifest as a negative value.
return value < 0;
}
@Override
public synchronized void flush() {
if (db == null) {
return;
}
try {
dbAccessor.flush();
} catch (final RocksDBException e) {
throw new ProcessorStateException("Error while executing flush from store " + name, e);
}
}
@Override
public void addToBatch(final KeyValue<byte[], byte[]> record,
final WriteBatch batch) throws RocksDBException {
dbAccessor.addToBatch(record.key, record.value, batch);
}
@Override
public void write(final WriteBatch batch) throws RocksDBException {
db.write(wOptions, batch);
}
@Override
public synchronized void close() {
if (!open) {
return;
}
open = false;
closeOpenIterators();
if (configSetter != null) {
configSetter.close(name, userSpecifiedOptions);
configSetter = null;
}
metricsRecorder.removeValueProviders(name);
// Important: do not rearrange the order in which the below objects are closed!
// Order of closing must follow: ColumnFamilyHandle > RocksDB > DBOptions > ColumnFamilyOptions
dbAccessor.close();
db.close();
userSpecifiedOptions.close();
wOptions.close();
fOptions.close();
filter.close();
cache.close();
dbAccessor = null;
userSpecifiedOptions = null;
wOptions = null;
fOptions = null;
db = null;
filter = null;
cache = null;
}
private void closeOpenIterators() {
final HashSet<KeyValueIterator<Bytes, byte[]>> iterators;
synchronized (openIterators) {
iterators = new HashSet<>(openIterators);
}
if (iterators.size() != 0) {
log.warn("Closing {} open iterators for store {}", iterators.size(), name);
for (final KeyValueIterator<Bytes, byte[]> iterator : iterators) {
iterator.close();
}
}
}
interface RocksDBAccessor {
void put(final byte[] key,
final byte[] value);
void prepareBatch(final List<KeyValue<Bytes, byte[]>> entries,
final WriteBatch batch) throws RocksDBException;
byte[] get(final byte[] key) throws RocksDBException;
/**
* In contrast to get(), we don't migrate the key to new CF.
* <p>
* Use for get() within delete() -- no need to migrate, as it's deleted anyway
*/
byte[] getOnly(final byte[] key) throws RocksDBException;
KeyValueIterator<Bytes, byte[]> range(final Bytes from,
final Bytes to,
final boolean forward);
/**
* Deletes keys entries in the range ['from', 'to'], including 'from' and excluding 'to'.
*/
void deleteRange(final byte[] from,
final byte[] to);
KeyValueIterator<Bytes, byte[]> all(final boolean forward);
KeyValueIterator<Bytes, byte[]> prefixScan(final Bytes prefix);
long approximateNumEntries() throws RocksDBException;
void flush() throws RocksDBException;
void prepareBatchForRestore(final Collection<KeyValue<byte[], byte[]>> records,
final WriteBatch batch) throws RocksDBException;
void addToBatch(final byte[] key,
final byte[] value,
final WriteBatch batch) throws RocksDBException;
void close();
}
class SingleColumnFamilyAccessor implements RocksDBAccessor {
private final ColumnFamilyHandle columnFamily;
SingleColumnFamilyAccessor(final ColumnFamilyHandle columnFamily) {
this.columnFamily = columnFamily;
}
@Override
public void put(final byte[] key,
final byte[] value) {
if (value == null) {
try {
db.delete(columnFamily, wOptions, key);
} catch (final RocksDBException e) {
// String format is happening in wrapping stores. So formatted message is thrown from wrapping stores.
throw new ProcessorStateException("Error while removing key from store " + name, e);
}
} else {
try {
db.put(columnFamily, wOptions, key, value);
} catch (final RocksDBException e) {
// String format is happening in wrapping stores. So formatted message is thrown from wrapping stores.
throw new ProcessorStateException("Error while putting key/value into store " + name, e);
}
}
}
@Override
public void prepareBatch(final List<KeyValue<Bytes, byte[]>> entries,
final WriteBatch batch) throws RocksDBException {
for (final KeyValue<Bytes, byte[]> entry : entries) {
Objects.requireNonNull(entry.key, "key cannot be null");
addToBatch(entry.key.get(), entry.value, batch);
}
}
@Override
public byte[] get(final byte[] key) throws RocksDBException {
return db.get(columnFamily, key);
}
@Override
public byte[] getOnly(final byte[] key) throws RocksDBException {
return db.get(columnFamily, key);
}
@Override
public KeyValueIterator<Bytes, byte[]> range(final Bytes from,
final Bytes to,
final boolean forward) {
return new RocksDBRangeIterator(
name,
db.newIterator(columnFamily),
openIterators,
from,
to,
forward,
true
);
}
@Override
public void deleteRange(final byte[] from, final byte[] to) {
try {
db.deleteRange(columnFamily, wOptions, from, to);
} catch (final RocksDBException e) {
// String format is happening in wrapping stores. So formatted message is thrown from wrapping stores.
throw new ProcessorStateException("Error while removing key from store " + name, e);
}
}
@Override
public KeyValueIterator<Bytes, byte[]> all(final boolean forward) {
final RocksIterator innerIterWithTimestamp = db.newIterator(columnFamily);
if (forward) {
innerIterWithTimestamp.seekToFirst();
} else {
innerIterWithTimestamp.seekToLast();
}
return new RocksDbIterator(name, innerIterWithTimestamp, openIterators, forward);
}
@Override
public KeyValueIterator<Bytes, byte[]> prefixScan(final Bytes prefix) {
final Bytes to = Bytes.increment(prefix);
return new RocksDBRangeIterator(
name,
db.newIterator(columnFamily),
openIterators,
prefix,
to,
true,
false
);
}
@Override
public long approximateNumEntries() throws RocksDBException {
return db.getLongProperty(columnFamily, "rocksdb.estimate-num-keys");
}
@Override
public void flush() throws RocksDBException {
db.flush(fOptions, columnFamily);
}
@Override
public void prepareBatchForRestore(final Collection<KeyValue<byte[], byte[]>> records,
final WriteBatch batch) throws RocksDBException {
for (final KeyValue<byte[], byte[]> record : records) {
addToBatch(record.key, record.value, batch);
}
}
@Override
public void addToBatch(final byte[] key,
final byte[] value,
final WriteBatch batch) throws RocksDBException {
if (value == null) {
batch.delete(columnFamily, key);
} else {
batch.put(columnFamily, key, value);
}
}
@Override
public void close() {
columnFamily.close();
}
}
void restoreBatch(final Collection<ConsumerRecord<byte[], byte[]>> records) {
try (final WriteBatch batch = new WriteBatch()) {
final List<KeyValue<byte[], byte[]>> keyValues = new ArrayList<>();
for (final ConsumerRecord<byte[], byte[]> record : records) {
ChangelogRecordDeserializationHelper.applyChecksAndUpdatePosition(
record,
consistencyEnabled,
position
);
// If version headers are not present or version is V0
keyValues.add(new KeyValue<>(record.key(), record.value()));
}
dbAccessor.prepareBatchForRestore(keyValues, batch);
write(batch);
} catch (final RocksDBException e) {
throw new ProcessorStateException("Error restoring batch to store " + name, e);
}
}
// for testing
public Options getOptions() {
return userSpecifiedOptions;
}
@Override
public Position getPosition() {
return position;
}
}
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