danny0405 commented on a change in pull request #4679: URL: https://github.com/apache/hudi/pull/4679#discussion_r816451410
########## File path: hudi-flink/src/main/java/org/apache/hudi/sink/BucketStreamWriteFunction.java ########## @@ -0,0 +1,158 @@ +/* + * 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.sink; + +import org.apache.flink.configuration.Configuration; +import org.apache.flink.runtime.state.FunctionInitializationContext; +import org.apache.flink.streaming.api.functions.ProcessFunction; +import org.apache.flink.util.Collector; +import org.apache.hudi.common.model.FileSlice; +import org.apache.hudi.common.model.HoodieKey; +import org.apache.hudi.common.model.HoodieRecord; +import org.apache.hudi.common.model.HoodieRecordLocation; +import org.apache.hudi.common.table.timeline.HoodieInstant; +import org.apache.hudi.common.util.Option; +import org.apache.hudi.configuration.FlinkOptions; +import org.apache.hudi.index.bucket.BucketIdentifier; +import org.apache.hudi.table.HoodieFlinkTable; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.IOException; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; + +import static java.util.stream.Collectors.toList; + +public class BucketStreamWriteFunction<I> extends StreamWriteFunction<I> { + + private static final Logger LOG = LoggerFactory.getLogger(BucketStreamWriteFunction.class); + + private int taskTotalParallelism; + + private int currentParallelism; + + private int hiveBucketNum; + + protected transient HoodieFlinkTable table; + + private String indexKeyFields; + + private HashMap<String, String> bucketToFileIDMap; + + /** + * Constructs a BucketStreamWriteFunction. + * + * @param config The config options + */ + public BucketStreamWriteFunction(Configuration config) { + super(config); + this.bucketToFileIDMap = new HashMap<String, String>(); + } + + @Override + public void open(Configuration parameters) throws IOException { + super.open(parameters); + this.hiveBucketNum = config.getInteger(FlinkOptions.BUCKET_INDEX_NUM_BUCKETS); + this.indexKeyFields = config.getString(FlinkOptions.INDEX_KEY_FIELD); + this.taskID = getRuntimeContext().getIndexOfThisSubtask(); + this.currentParallelism = getRuntimeContext().getNumberOfParallelSubtasks(); + this.taskTotalParallelism = getRuntimeContext().getMaxNumberOfParallelSubtasks(); + bootstrapIndex(); + } + + @Override + public void initializeState(FunctionInitializationContext context) throws Exception { + super.initializeState(context); + this.table = this.writeClient.getHoodieTable(); + } + + @Override + public void processElement(I i, ProcessFunction<I, Object>.Context context, Collector<Object> collector) throws Exception { + HoodieRecord<?> record = (HoodieRecord<?>) i; + final HoodieKey hoodieKey = record.getKey(); + final HoodieRecordLocation location; + + final int bucketNum = BucketIdentifier.getBucketId(hoodieKey, indexKeyFields, hiveBucketNum); + final String partitionBucketId = BucketIdentifier.partitionBucketIdStr(hoodieKey.getPartitionPath(), bucketNum); + + if (bucketToFileIDMap.containsKey(partitionBucketId)) { + location = new HoodieRecordLocation("U", bucketToFileIDMap.get(partitionBucketId)); + } else { + String newFileId = BucketIdentifier.newBucketFileIdPrefix(bucketNum); + location = new HoodieRecordLocation("I", newFileId); + bucketToFileIDMap.put(partitionBucketId, newFileId); + } + record.unseal(); + record.setCurrentLocation(location); + record.seal(); + bufferRecord(record); + } + + /** + * Get partition_bucket -> fileID mapping from the existing hudi table. + * This is a required operation for each restart to avoid having duplicate file ids for one bucket. + */ + private void bootstrapIndex() throws IOException { + Option<HoodieInstant> latestCommitTime = table.getFileSystemView().getTimeline().filterCompletedInstants().lastInstant(); + if (!latestCommitTime.isPresent()) { + return; + } + // bootstrap bucket info from existing file system + // bucketNum % totalParallelism == this taskID belongs to this task + HashSet<Integer> bucketToLoad = new HashSet<>(); + for (int i = 0; i < hiveBucketNum; i++) { + int partitionOfBucket = BucketIdentifier.mod(i, currentParallelism); + if (partitionOfBucket == taskID) { + LOG.info(String.format("Bootstrapping index. Adding bucket %s , " + + "Current parallelism: %s , Max parallelism: %s , Current task id: %s", + i, currentParallelism, taskTotalParallelism, taskID)); + bucketToLoad.add(i); + } + } + bucketToLoad.stream().forEach(bucket -> LOG.info(String.format("bucketToLoad contains %s", bucket))); + + LOG.info(String.format("Loading Hoodie Table %s, with path %s", table.getMetaClient().getTableConfig().getTableName(), + table.getMetaClient().getBasePath())); + + // Iterate through all existing partitions to load existing fileID belongs to this task + List<String> partitions = table.getMetadata().getAllPartitionPaths(); + for (String partitionPath : partitions) { + List<FileSlice> latestFileSlices = table.getSliceView() + .getLatestFileSlices(partitionPath) + .collect(toList()); + for (FileSlice fileslice : latestFileSlices) { + String fileID = fileslice.getFileId(); + int bucketNumber = BucketIdentifier.bucketIdFromFileId(fileID); + if (bucketToLoad.contains(bucketNumber)) { + String partitionBucketId = BucketIdentifier.partitionBucketIdStr(partitionPath, bucketNumber); + LOG.info(String.format("Should load this partition bucket %s with fileID %s", partitionBucketId, fileID)); + if (bucketToFileIDMap.containsKey(partitionBucketId)) { + throw new RuntimeException(String.format("Duplicate fileID %s from partitionBucket %s found " + + "during the fileGroupPerPartitionedBucketState initialization.", fileID, partitionBucketId)); + } else { + LOG.info(String.format("Adding fileID %s to the partition bucket %s.", fileID, partitionBucketId)); + bucketToFileIDMap.put(partitionBucketId, fileID); + } Review comment: The checkpoint can keep the correctness i think. -- This is an automated message from the Apache Git Service. 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