snleee commented on a change in pull request #3543: Segment merge lineage data structure URL: https://github.com/apache/incubator-pinot/pull/3543#discussion_r238502057
########## File path: pinot-common/src/main/java/com/linkedin/pinot/common/lineage/SegmentMergeLineage.java ########## @@ -0,0 +1,333 @@ +/** + * Copyright (C) 2014-2018 LinkedIn Corp. ([email protected]) + * + * Licensed 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 com.linkedin.pinot.common.lineage; + +import com.linkedin.pinot.common.exception.InvalidConfigException; +import com.linkedin.pinot.common.utils.EqualityUtils; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import org.apache.helix.ZNRecord; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + + +/** + * Class to represent segment merge lineage information. + * + * Segment merge lineage information is serialized into a znode and stored in a helix property store (zookeeper). This + * information will be used by the broker, segment merge task generator, and retention manager. + * + * For each segment group, we are storing the following information: + * 1. group id + * - group identifier (will be stored in time based uuid format) + * 2. group level + * - segment level allows us to have a hierarchical representation of the segment lineage. When we assign the merge + * task, we will only merge/roll-up segments with the same level. + * (e.g. If hourly segment groups are in level 0, daily segment groups will belong to level 1) + * 3. segments + * - segments that belong to a particular segment group + * 4. lineage information + * - If a segment group is created by merging multiple children segment groups, we write the lineage information + * (e.g. segment group C is merged from segment group A, B) + */ +public class SegmentMergeLineage { + + private static final Logger LOGGER = LoggerFactory.getLogger(SegmentMergeLineage.class); + + private static final String LEVEL_KEY_PREFIX = "level_"; + private static final String ROOT_NODE_GROUP_ID = "root"; + private static final String SEGMENT_DELIMITER = ","; + private static final int DEFAULT_GROUP_LEVEL = 0; + + private String _tableNameWithType; + + // Mapping of group id to children group ids + private Map<String, List<String>> _parentGroupToChildrenGroupsMap; + + // Mapping of group level to group id to segments that belong to a group + // Segment level represents Review comment: added an example in the class header ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
