| /* |
| * 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.log; |
| |
| import org.apache.hudi.common.model.HoodieAvroIndexedRecord; |
| import org.apache.hudi.common.model.HoodieLogFile; |
| import org.apache.hudi.common.model.HoodieRecord.HoodieRecordType; |
| import org.apache.hudi.common.table.log.block.HoodieDataBlock; |
| import org.apache.hudi.common.util.ClosableIterator; |
| import org.apache.hudi.common.util.MappingIterator; |
| import org.apache.hudi.exception.HoodieIOException; |
| |
| import org.apache.avro.Schema; |
| import org.apache.avro.generic.IndexedRecord; |
| import org.apache.hadoop.fs.FileSystem; |
| |
| import java.io.IOException; |
| import java.util.Arrays; |
| import java.util.Iterator; |
| |
| /** |
| * Record iterator for Hudi logs in CDC format. |
| */ |
| public class HoodieCDCLogRecordIterator implements ClosableIterator<IndexedRecord> { |
| |
| private final FileSystem fs; |
| |
| private final Schema cdcSchema; |
| |
| private final Iterator<HoodieLogFile> cdcLogFileIter; |
| |
| private HoodieLogFormat.Reader reader; |
| |
| private ClosableIterator<IndexedRecord> itr; |
| |
| private IndexedRecord record; |
| |
| public HoodieCDCLogRecordIterator(FileSystem fs, HoodieLogFile[] cdcLogFiles, Schema cdcSchema) { |
| this.fs = fs; |
| this.cdcSchema = cdcSchema; |
| this.cdcLogFileIter = Arrays.stream(cdcLogFiles).iterator(); |
| } |
| |
| @Override |
| public boolean hasNext() { |
| if (record != null) { |
| return true; |
| } |
| if (itr == null || !itr.hasNext()) { |
| if (reader == null || !reader.hasNext()) { |
| // step1: load new file reader first. |
| if (!loadReader()) { |
| return false; |
| } |
| } |
| // step2: load block records iterator |
| if (!loadItr()) { |
| return false; |
| } |
| } |
| record = itr.next(); |
| return true; |
| } |
| |
| private boolean loadReader() { |
| try { |
| closeReader(); |
| if (cdcLogFileIter.hasNext()) { |
| reader = new HoodieLogFileReader(fs, cdcLogFileIter.next(), cdcSchema, |
| HoodieLogFileReader.DEFAULT_BUFFER_SIZE, false); |
| return reader.hasNext(); |
| } |
| return false; |
| } catch (IOException e) { |
| throw new HoodieIOException(e.getMessage()); |
| } |
| } |
| |
| private boolean loadItr() { |
| HoodieDataBlock dataBlock = (HoodieDataBlock) reader.next(); |
| closeItr(); |
| // TODO support cdc with spark record. |
| itr = new MappingIterator(dataBlock.getRecordIterator(HoodieRecordType.AVRO), record -> ((HoodieAvroIndexedRecord) record).getData()); |
| return itr.hasNext(); |
| } |
| |
| @Override |
| public IndexedRecord next() { |
| IndexedRecord ret = record; |
| record = null; |
| return ret; |
| } |
| |
| @Override |
| public void close() { |
| try { |
| closeItr(); |
| closeReader(); |
| } catch (IOException e) { |
| throw new HoodieIOException(e.getMessage()); |
| } |
| } |
| |
| // ------------------------------------------------------------------------- |
| // Utilities |
| // ------------------------------------------------------------------------- |
| |
| private void closeReader() throws IOException { |
| if (reader != null) { |
| reader.close(); |
| reader = null; |
| } |
| } |
| |
| private void closeItr() { |
| if (itr != null) { |
| itr.close(); |
| itr = null; |
| } |
| } |
| } |