HeimingZ commented on a change in pull request #5320: URL: https://github.com/apache/iotdb/pull/5320#discussion_r839353102
########## File path: server/src/main/java/org/apache/iotdb/db/wal/checkpoint/CheckpointManager.java ########## @@ -0,0 +1,255 @@ +/* + * 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.iotdb.db.wal.checkpoint; + +import org.apache.iotdb.db.conf.IoTDBConfig; +import org.apache.iotdb.db.conf.IoTDBDescriptor; +import org.apache.iotdb.db.engine.fileSystem.SystemFileFactory; +import org.apache.iotdb.db.wal.io.CheckpointWriter; +import org.apache.iotdb.db.wal.io.ILogWriter; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.File; +import java.io.FileNotFoundException; +import java.io.IOException; +import java.nio.ByteBuffer; +import java.util.ArrayList; +import java.util.Collections; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.concurrent.locks.Lock; +import java.util.concurrent.locks.ReentrantLock; + +/** This class is used to manage checkpoints of one wal node */ +public class CheckpointManager implements AutoCloseable { + /** use size limit to control WALEdit number in each file */ + public static final long LOG_SIZE_LIMIT = 3 * 1024 * 1024; + + private static final Logger logger = LoggerFactory.getLogger(CheckpointManager.class); + private static final IoTDBConfig config = IoTDBDescriptor.getInstance().getConfig(); + + /** WALNode identifier of this checkpoint manager */ + protected final String identifier; + /** directory to store .checkpoint file */ + protected final String logDirectory; + /** + * protect concurrent safety of checkpoint info, including memTableId2Info, cachedByteBuffer, + * currentLogVersion and currentLogWriter + */ + private final Lock infoLock = new ReentrantLock(); + // region these variables should be protected by infoLock + /** memTable id -> memTable info */ + private final Map<Integer, MemTableInfo> memTableId2Info = new HashMap<>(); Review comment: It's better for CheckpointManager to manage its' own information. -- 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: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
