| /* |
| * 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; |
| |
| import org.apache.hudi.common.model.HoodieTableType; |
| import org.apache.hudi.common.table.HoodieTableMetaClient; |
| import org.apache.hudi.common.table.timeline.HoodieActiveTimeline; |
| import org.apache.hudi.common.table.timeline.HoodieInstant; |
| import org.apache.hudi.common.table.timeline.HoodieTimeline; |
| import org.apache.hudi.common.util.CollectionUtils; |
| |
| import org.apache.hadoop.fs.FileSystem; |
| |
| import java.util.List; |
| import java.util.stream.Collectors; |
| |
| /** |
| * List of helpers to aid, construction of instanttime for read and write operations using datasource. |
| */ |
| @PublicAPIClass(maturity = ApiMaturityLevel.STABLE) |
| public class HoodieDataSourceHelpers { |
| |
| /** |
| * Checks if the Hoodie table has new data since given timestamp. This can be subsequently fed to an incremental |
| * view read, to perform incremental processing. |
| */ |
| @PublicAPIMethod(maturity = ApiMaturityLevel.STABLE) |
| public static boolean hasNewCommits(FileSystem fs, String basePath, String commitTimestamp) { |
| return listCommitsSince(fs, basePath, commitTimestamp).size() > 0; |
| } |
| |
| /** |
| * Get a list of instant times that have occurred, from the given instant timestamp. |
| */ |
| @PublicAPIMethod(maturity = ApiMaturityLevel.STABLE) |
| public static List<String> listCommitsSince(FileSystem fs, String basePath, String instantTimestamp) { |
| HoodieTimeline timeline = allCompletedCommitsCompactions(fs, basePath); |
| return timeline.findInstantsAfter(instantTimestamp, Integer.MAX_VALUE).getInstants() |
| .map(HoodieInstant::getTimestamp).collect(Collectors.toList()); |
| } |
| |
| /** |
| * Returns the last successful write operation's instant time. |
| */ |
| @PublicAPIMethod(maturity = ApiMaturityLevel.STABLE) |
| public static String latestCommit(FileSystem fs, String basePath) { |
| HoodieTimeline timeline = allCompletedCommitsCompactions(fs, basePath); |
| return timeline.lastInstant().get().getTimestamp(); |
| } |
| |
| /** |
| * Obtain all the commits, compactions that have occurred on the timeline, whose instant times could be fed into the |
| * datasource options. |
| */ |
| @PublicAPIMethod(maturity = ApiMaturityLevel.STABLE) |
| public static HoodieTimeline allCompletedCommitsCompactions(FileSystem fs, String basePath) { |
| HoodieTableMetaClient metaClient = new HoodieTableMetaClient(fs.getConf(), basePath, true); |
| if (metaClient.getTableType().equals(HoodieTableType.MERGE_ON_READ)) { |
| return metaClient.getActiveTimeline().getTimelineOfActions( |
| CollectionUtils.createSet(HoodieActiveTimeline.COMMIT_ACTION, |
| HoodieActiveTimeline.DELTA_COMMIT_ACTION)).filterCompletedInstants(); |
| } else { |
| return metaClient.getCommitTimeline().filterCompletedInstants(); |
| } |
| } |
| } |