EMsnap commented on code in PR #7878: URL: https://github.com/apache/inlong/pull/7878#discussion_r1174499565
########## inlong-sort/sort-connectors/iceberg/src/main/java/org/apache/inlong/sort/iceberg/sink/collections/RocksDBKVBuffer.java: ########## @@ -0,0 +1,177 @@ +/* + * 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.inlong.sort.iceberg.sink.collections; + +import org.apache.flink.api.common.typeutils.TypeSerializer; +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.shaded.guava18.com.google.common.base.Preconditions; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.Closeable; +import java.io.File; +import java.io.IOException; +import java.io.Serializable; +import java.util.UUID; +import java.util.stream.Stream; + +/** + * This class provides a disk spillable only kv buffer implementation. + * All of the data is stored using the RocksDB implementation. + */ +public final class RocksDBKVBuffer<T, R> implements Closeable, KVBuffer<T, R>, Serializable { + + // ColumnFamily allows partitioning data within RockDB, which allows + // independent configuration and faster deletes across partitions + // https://github.com/facebook/rocksdb/wiki/Column-Families + // For this use case, we use a single static column family/ partition + private static final Logger LOG = LoggerFactory.getLogger(RocksDBKVBuffer.class); + private static final long serialVersionUID = 1L; + private static final String ROCKSDB_COL_FAMILY = "rocksdb-diskmap"; + + private transient RocksDBDAO<T, R> rocksDb; + private transient boolean closed = false; + private transient Thread shutdownThread = null; + protected String diskMapPath; + protected final TypeSerializer<T> keySerializer; + protected final TypeSerializer<R> valueSerializer; + protected final String rocksDbStoragePath; + + public RocksDBKVBuffer( + TypeSerializer<T> keySerializer, + TypeSerializer<R> valueSerializer, + String rocksDbStoragePath) { + this.keySerializer = keySerializer; + this.valueSerializer = valueSerializer; + this.rocksDbStoragePath = rocksDbStoragePath; + } + + @Override + public R put(T key, R value) { + checkClosed(); + lazyGetRocksDb().put(ROCKSDB_COL_FAMILY, key, value); + return value; + } + + @Override + public R remove(T key) { + checkClosed(); + R value = get(key); + if (value != null) { + lazyGetRocksDb().delete(ROCKSDB_COL_FAMILY, (T) key); + } + return value; + } + + @Override + public R get(T key) { + checkClosed(); + return lazyGetRocksDb().get(ROCKSDB_COL_FAMILY, key); + } + + /** + * Perform a range search according to the prefix of the key, and the KV data of all keys matching the + * prefix will be returned + * @note This stream must be closed after use, otherwise it will cause a memory leak + * + * @param keyPrefix key prefix binary data + * @return + */ + @Override + public Stream<Tuple2<T, R>> scan(byte[] keyPrefix) { + checkClosed(); + return lazyGetRocksDb().prefixSearch(ROCKSDB_COL_FAMILY, keyPrefix); + } + + @Override + public void clear() { + checkClosed(); + // todo: Here use close to mock clear.Because drop column family and recreate column family has memory leak bug. + // In rocksdb 5.x after dropColumnFamily and close, it will wait rocksdb release memory and disk itself. + // So if open a same columnFamily, it will cause memory leak. So you could not close and recreate a + // column family as soon as possible.In rocksdb 6.x it is ok. + if (null != rocksDb) { + LOG.info("Close rocksdb dir in {}", diskMapPath); + rocksDb.close(); + cleanup(false); + } + rocksDb = null; + } + + @Override + public void close() { + if (null != rocksDb) { + LOG.info("Close rocksdb dir in {}", diskMapPath); + rocksDb.close(); + cleanup(false); + } + rocksDb = null; + closed = true; + + } + + private void checkClosed() { + Preconditions.checkArgument(!closed, "Could not operate a close RocksDB KV Buffer"); + } + + private void cleanup() { + this.cleanup(true); + } + + private void addShutDownHook() { + this.shutdownThread = new Thread(this::cleanup); + Runtime.getRuntime().addShutdownHook(this.shutdownThread); + } + + private void cleanup(boolean isTriggeredFromShutdownHook) { + try { + FileIOUtils.deleteDirectory(new File(diskMapPath)); + } catch (IOException var3) { + LOG.warn("Error while deleting the disk map directory=" + this.diskMapPath, var3); + } + + if (!isTriggeredFromShutdownHook && this.shutdownThread != null) { + Runtime.getRuntime().removeShutdownHook(this.shutdownThread); + } + } + + private RocksDBDAO<T, R> lazyGetRocksDb() { + if (null == rocksDb) { + synchronized (this) { + if (null == rocksDb) { + diskMapPath = String.format("%s%s%s-%s", Review Comment: IIUC, we should provide the settings for the user for where to store the rocksdb data ? Also some important config in case that user want to change some parameter for improvement -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@inlong.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
