jun0315 commented on code in PR #8619: URL: https://github.com/apache/iotdb/pull/8619#discussion_r1058502865
########## schema-engine-tag/src/main/java/org/apache/iotdb/db/metadata/tagSchemaRegion/tagIndex/flush/MemChunkFlush.java: ########## @@ -0,0 +1,103 @@ +/* + * 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.iotdb.db.metadata.tagSchemaRegion.tagIndex.flush; + +import org.apache.iotdb.db.metadata.tagSchemaRegion.tagIndex.file.entry.Chunk; +import org.apache.iotdb.db.metadata.tagSchemaRegion.tagIndex.file.entry.ChunkIndex; +import org.apache.iotdb.db.metadata.tagSchemaRegion.tagIndex.file.entry.ChunkIndexEntry; +import org.apache.iotdb.db.metadata.tagSchemaRegion.tagIndex.file.entry.ChunkIndexHeader; +import org.apache.iotdb.db.metadata.tagSchemaRegion.tagIndex.memtable.MemChunk; +import org.apache.iotdb.db.metadata.tagSchemaRegion.tagIndex.request.FlushRequest; +import org.apache.iotdb.db.metadata.tagSchemaRegion.tagIndex.response.FlushResponse; +import org.apache.iotdb.db.metadata.tagSchemaRegion.utils.ConvertUtils; +import org.apache.iotdb.lsm.annotation.FlushProcessor; +import org.apache.iotdb.lsm.context.requestcontext.FlushRequestContext; +import org.apache.iotdb.lsm.levelProcess.FlushLevelProcessor; +import org.apache.iotdb.lsm.sstable.fileIO.FileOutput; + +import org.roaringbitmap.RoaringBitmap; + +import java.io.IOException; +import java.nio.ByteBuffer; +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; + +/** flush for MemChunk */ +@FlushProcessor(level = 2) +public class MemChunkFlush extends FlushLevelProcessor<MemChunk, Object, FlushRequest> { + + @Override + public List<Object> getChildren( + MemChunk memNode, FlushRequest request, FlushRequestContext context) { + return null; + } + + @Override + public void flush(MemChunk memNode, FlushRequest request, FlushRequestContext context) + throws IOException { + FileOutput fileOutput = context.getFileOutput(); + List<RoaringBitmap> roaringBitmaps = sliceMemChunk(memNode, request.getChunkMaxSize()); + ChunkIndex chunkIndex = new ChunkIndex(); + int count = 0; + for (RoaringBitmap roaringBitmap : roaringBitmaps) { + Chunk chunk = ConvertUtils.getChunkFromRoaringBitMap(roaringBitmap); + byte[] bytes = new byte[chunk.getChunkHeader().getSize()]; + roaringBitmap.serialize(ByteBuffer.wrap(bytes)); + fileOutput.write(bytes); + ChunkIndexEntry chunkIndexEntry = + ConvertUtils.getChunkIndexEntryFromRoaringBitMap(roaringBitmap); + chunkIndexEntry.setOffset(fileOutput.write(chunk.getChunkHeader())); + chunkIndex.getChunkIndexEntries().add(chunkIndexEntry); + count++; + } + chunkIndex.setChunkIndexHeader(new ChunkIndexHeader(count)); + long offset = fileOutput.write(chunkIndex); + FlushResponse response = context.getResponse(); + response.addChunkOffset(memNode, offset); + } + + private List<RoaringBitmap> sliceMemChunk(MemChunk memNode, long chunkMaxSize) { + RoaringBitmap roaringBitmap = memNode.getRoaringBitmap(); + int originalSize = roaringBitmap.serializedSizeInBytes(); + int sliceNum = (int) (originalSize / chunkMaxSize) + 1; + if (sliceNum == 1) { + return Collections.singletonList(roaringBitmap); + } else { + List<RoaringBitmap> roaringBitmaps = new ArrayList<>(); + for (int i = 0; i < sliceNum; i++) { + roaringBitmaps.add(new RoaringBitmap()); + } + int[] results = roaringBitmap.stream().toArray(); + int quotient = results.length % sliceNum; + int count = results.length / sliceNum; + int index = 0; + for (int i = 0; i < results.length; i++) { + int gap = index < quotient ? count + 1 : count; + int start = i; + for (; start <= i + gap; start++) { + roaringBitmaps.get(index).add(results[start]); + } + i = start; + index++; + } + return roaringBitmaps; Review Comment: Add ut and is passed. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: reviews-unsubscr...@iotdb.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
