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 * 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.hudi.common.table.view;

import org.apache.hudi.common.model.CompactionOperation;
import org.apache.hudi.common.model.FileSlice;
import org.apache.hudi.common.model.HoodieBaseFile;
import org.apache.hudi.common.model.HoodieFileGroup;
import org.apache.hudi.common.model.HoodieFileGroupId;
import org.apache.hudi.common.table.timeline.HoodieInstant;
import org.apache.hudi.common.table.timeline.HoodieTimeline;
import org.apache.hudi.common.util.Option;
import org.apache.hudi.common.util.collection.Pair;

import java.util.List;
import java.util.Map;
import java.util.stream.Stream;

/**
 * Interface for viewing the table file system.
 *
 * @since 0.3.0
 */
public interface TableFileSystemView {

  /**
   * Methods to only access latest version of file for the instant(s) passed.
   */
  interface BaseFileOnlyViewWithLatestSlice {

    /**
     * Stream all the latest data files in the given partition.
     */
    Stream getLatestBaseFiles(String partitionPath);

    /**
     * Get Latest data file for a partition and file-Id.
     */
    Option getLatestBaseFile(String partitionPath, String fileId);

    /**
     * Stream all the latest data files, in the file system view.
     */
    Stream getLatestBaseFiles();

    /**
     * Stream all the latest version data files in the given partition with precondition that commitTime(file) before
     * maxCommitTime.
     */
    Stream getLatestBaseFilesBeforeOrOn(String partitionPath, String maxCommitTime);

    /**
     * Streams the latest version base files in all partitions with precondition that
     * commitTime(file) before maxCommitTime.
     *
     * @param maxCommitTime The max commit time to consider.
     * @return A {@link Map} of partition path to the latest version base files before or on the
     * commit time
     */
    Map> getAllLatestBaseFilesBeforeOrOn(String maxCommitTime);

    /**
     * Stream all the latest data files pass.
     */
    Stream getLatestBaseFilesInRange(List commitsToReturn);
  }

  /**
   * Methods to provide a view of base files only.
   */
  interface BaseFileOnlyView extends BaseFileOnlyViewWithLatestSlice {
    /**
     * Stream all the data file versions grouped by FileId for a given partition.
     */
    Stream getAllBaseFiles(String partitionPath);

    /**
     * Get the version of data file matching the instant time in the given partition.
     */
    Option getBaseFileOn(String partitionPath, String instantTime, String fileId);

  }

  /**
   * Methods to only access latest version of file-slice for the instant(s) passed.
   */
  interface SliceViewWithLatestSlice {

    /**
     * Stream all the latest file slices in the given partition.
     */
    Stream getLatestFileSlices(String partitionPath);

    /**
     * Get the latest file slices for a given partition including the inflight ones.
     *
     * @param partitionPath The partition path of interest
     * @return Stream of latest {@link FileSlice} in the partition path.
     */
    Stream getLatestFileSlicesIncludingInflight(String partitionPath);

    /**
     * Stream all the latest file slices in the given partition
     * without caching the file group mappings.
     *
     * 

This is useful for some table services such as compaction and clustering, these services may search around the files to clean * within some ancient data partitions, if there triggers a full table service for enormous number of partitions, the cache could * cause a huge memory pressure to the timeline server which induces an OOM exception. * *

The caching of these file groups does not benefit to writers most often because the writers * write to recent data partitions usually. */ Stream getLatestFileSlicesStateless(String partitionPath); /** * Get Latest File Slice for a given fileId in a given partition. */ Option getLatestFileSlice(String partitionPath, String fileId); /** * Stream all the latest uncompacted file slices in the given partition. */ Stream getLatestUnCompactedFileSlices(String partitionPath); /** * Stream all latest file slices in given partition with precondition that commitTime(file) before maxCommitTime. * * @param partitionPath Partition path * @param maxCommitTime Max Instant Time * @param includeFileSlicesInPendingCompaction include file-slices that are in pending compaction */ Stream getLatestFileSlicesBeforeOrOn(String partitionPath, String maxCommitTime, boolean includeFileSlicesInPendingCompaction); /** * Stream all latest file slices with precondition that commitTime(file) before maxCommitTime. * * @param maxCommitTime Max Instant Time * @return A {@link Map} of partition path to the latest file slices before maxCommitTime. */ Map> getAllLatestFileSlicesBeforeOrOn(String maxCommitTime); /** * Stream all "merged" file-slices before on an instant time If a file-group has a pending compaction request, the * file-slice before and after compaction request instant is merged and returned. * * @param partitionPath Partition Path * @param maxInstantTime Max Instant Time * @return */ Stream getLatestMergedFileSlicesBeforeOrOn(String partitionPath, String maxInstantTime); /** * Stream all the latest file slices, in the given range. */ Stream getLatestFileSliceInRange(List commitsToReturn); } /** * Methods to access a combination of base files + log file slices. */ interface SliceView extends SliceViewWithLatestSlice { /** * Stream all the file slices for a given partition, latest or not. */ Stream getAllFileSlices(String partitionPath); } /** * Stream all the file groups for a given partition. */ Stream getAllFileGroups(String partitionPath); /** * Stream all the file groups for a given partition without caching the file group mappings. * *

This is useful for some table services such as cleaning, the cleaning service may search around the files to clean * within some ancient data partitions, if there triggers a full table cleaning for enormous number of partitions, the cache could * cause a huge memory pressure to the timeline server which induces an OOM exception. * *

The caching of these file groups does not benefit to writers most often because the writers * write to recent data partitions usually. */ Stream getAllFileGroupsStateless(String partitionPath); /** * Return Pending Compaction Operations. * * @return Stream> */ Stream> getPendingCompactionOperations(); /** * Return Pending Compaction Operations. * * @return Stream> */ Stream> getPendingLogCompactionOperations(); /** * Last Known Instant on which the view is built. */ Option getLastInstant(); /** * Timeline corresponding to the view. */ HoodieTimeline getTimeline(); /** * Stream all the replaced file groups before or on maxCommitTime for given partition. */ Stream getReplacedFileGroupsBeforeOrOn(String maxCommitTime, String partitionPath); /** * Stream all the replaced file groups before maxCommitTime for given partition. */ Stream getReplacedFileGroupsBefore(String maxCommitTime, String partitionPath); /** * Stream all the replaced file groups after or on minCommitTime. */ Stream getReplacedFileGroupsAfterOrOn(String minCommitTime, String partitionPath); /** * Stream all the replaced file groups for given partition. */ Stream getAllReplacedFileGroups(String partitionPath); /** * Filegroups that are in pending clustering. */ Stream> getFileGroupsInPendingClustering(); /** * Load all partition and file slices into view */ void loadAllPartitions(); /** * Load all partition and file slices into view for the provided partition paths * @param partitionPaths List of partition paths to load */ void loadPartitions(List partitionPaths); }





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