ChenSammi commented on code in PR #3292: URL: https://github.com/apache/ozone/pull/3292#discussion_r853945407
########## hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/volume/DbVolume.java: ########## @@ -0,0 +1,150 @@ +/* + * 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.hadoop.ozone.container.common.volume; + +import org.apache.hadoop.ozone.container.common.utils.DatanodeStoreCache; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.File; +import java.io.IOException; +import java.util.LinkedHashSet; +import java.util.Set; + +import static org.apache.hadoop.ozone.OzoneConsts.CONTAINER_DB_NAME; + +/** + * DbVolume represents a volume in datanode holding db instances + * for multiple HddsVolumes. One HddsVolume will have one subdirectory + * for its db instance under a DbVolume. + * + * For example: + * Say we have an SSD device mounted at /ssd1, then the DbVolume + * root directory is /ssd1/db, and we have a subdirectory + * for db instance like + * /ssd1/db/<clusterID>/<storageID>/container.db. + */ +public class DbVolume extends StorageVolume { + + private static final Logger LOG = LoggerFactory.getLogger(DbVolume.class); + + public static final String DB_VOLUME_DIR = "db"; + + /** + * Records all HddsVolumes that put its db instance under this DbVolume. + */ + private final Set<String> hddsVolumeIDs; + + protected DbVolume(Builder b) throws IOException { + super(b); + + this.hddsVolumeIDs = new LinkedHashSet<>(); + if (!b.getFailedVolume()) { + LOG.info("Creating DbVolume: {} of storage type : {} capacity : {}", + getStorageDir(), b.getStorageType(), getVolumeInfo().getCapacity()); + initialize(); + } + } + + @Override + protected void initialize() throws IOException { + super.initialize(); + scanForHddsVolumeIDs(); + } + + @Override + public void failVolume() { + super.failVolume(); + closeAllDbStore(); + } + + @Override + public void shutdown() { + super.shutdown(); + closeAllDbStore(); + } + + public void addHddsVolumeID(String id) { + hddsVolumeIDs.add(id); + } + + public Set<String> getHddsVolumeIDs() { + return this.hddsVolumeIDs; + } + + /** + * Builder class for DbVolume. + */ + public static class Builder extends StorageVolume.Builder<Builder> { + + public Builder(String volumeRootStr) { + super(volumeRootStr, DB_VOLUME_DIR); + } + + @Override + public Builder getThis() { + return this; + } + + public DbVolume build() throws IOException { + return new DbVolume(this); + } + } + + private void scanForHddsVolumeIDs() throws IOException { + // Not formatted yet + if (getClusterID() == null) { Review Comment: Will it be better if we detect if state == NORMAL , then continue the process, otherwise return? Checking state is more straightforward. -- 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] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
