| /* |
| * 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.rescon; |
| |
| import org.apache.iotdb.db.conf.IoTDBConfig; |
| import org.apache.iotdb.db.conf.IoTDBDescriptor; |
| import org.apache.iotdb.db.engine.memtable.IMemTable; |
| import org.apache.iotdb.db.engine.memtable.PrimitiveMemTable; |
| import org.apache.iotdb.db.exception.WriteProcessException; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class MemTableManager { |
| |
| private static final IoTDBConfig CONFIG = IoTDBDescriptor.getInstance().getConfig(); |
| |
| private static final Logger logger = LoggerFactory.getLogger(MemTableManager.class); |
| |
| private static final int WAIT_TIME = 100; |
| public static final int MEMTABLE_NUM_FOR_EACH_PARTITION = 4; |
| private int currentMemtableNumber = 0; |
| |
| private MemTableManager() {} |
| |
| public static MemTableManager getInstance() { |
| return InstanceHolder.INSTANCE; |
| } |
| |
| /** |
| * Called when memory control is disabled |
| * |
| * @throws WriteProcessException |
| */ |
| public synchronized IMemTable getAvailableMemTable(String storageGroup) |
| throws WriteProcessException { |
| if (!reachMaxMemtableNumber()) { |
| currentMemtableNumber++; |
| return new PrimitiveMemTable(); |
| } |
| |
| // wait until the total number of memtable is less than the system capacity |
| int waitCount = 1; |
| while (true) { |
| if (!reachMaxMemtableNumber()) { |
| currentMemtableNumber++; |
| return new PrimitiveMemTable(); |
| } |
| try { |
| wait(WAIT_TIME); |
| } catch (InterruptedException e) { |
| logger.error("{} fails to wait for memtables {}, continue to wait", storageGroup, e); |
| Thread.currentThread().interrupt(); |
| throw new WriteProcessException(e); |
| } |
| if (waitCount++ % 10 == 0) { |
| logger.info("{} has waited for a memtable for {}ms", storageGroup, waitCount * WAIT_TIME); |
| } |
| } |
| } |
| |
| public int getCurrentMemtableNumber() { |
| return currentMemtableNumber; |
| } |
| |
| public synchronized void addMemtableNumber() { |
| currentMemtableNumber++; |
| } |
| |
| public synchronized void decreaseMemtableNumber() { |
| currentMemtableNumber--; |
| notifyAll(); |
| } |
| |
| /** Called when memory control is disabled */ |
| private boolean reachMaxMemtableNumber() { |
| return currentMemtableNumber >= CONFIG.getMaxMemtableNumber(); |
| } |
| |
| /** Called when memory control is disabled */ |
| public synchronized void addOrDeleteStorageGroup(int diff) { |
| int maxMemTableNum = CONFIG.getMaxMemtableNumber(); |
| maxMemTableNum += |
| MEMTABLE_NUM_FOR_EACH_PARTITION * CONFIG.getConcurrentWritingTimePartition() * diff; |
| CONFIG.setMaxMemtableNumber(maxMemTableNum); |
| notifyAll(); |
| } |
| |
| public synchronized void close() { |
| currentMemtableNumber = 0; |
| } |
| |
| private static class InstanceHolder { |
| |
| private static final MemTableManager INSTANCE = new MemTableManager(); |
| |
| private InstanceHolder() {} |
| } |
| } |