tibrewalpratik17 commented on code in PR #13347: URL: https://github.com/apache/pinot/pull/13347#discussion_r1701502439
########## pinot-segment-local/src/main/java/org/apache/pinot/segment/local/upsert/ConcurrentMapPartitionUpsertMetadataManagerForConsistentDeletes.java: ########## @@ -0,0 +1,373 @@ +/** + * 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.pinot.segment.local.upsert; + +import com.google.common.annotations.VisibleForTesting; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Iterator; +import java.util.Map; +import java.util.Objects; +import java.util.Set; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.atomic.AtomicInteger; +import javax.annotation.Nullable; +import javax.annotation.concurrent.ThreadSafe; +import org.apache.pinot.common.metrics.ServerMeter; +import org.apache.pinot.segment.local.indexsegment.immutable.ImmutableSegmentImpl; +import org.apache.pinot.segment.local.segment.readers.LazyRow; +import org.apache.pinot.segment.local.utils.HashUtils; +import org.apache.pinot.segment.spi.ImmutableSegment; +import org.apache.pinot.segment.spi.IndexSegment; +import org.apache.pinot.segment.spi.MutableSegment; +import org.apache.pinot.segment.spi.index.mutable.ThreadSafeMutableRoaringBitmap; +import org.apache.pinot.spi.data.readers.GenericRow; +import org.apache.pinot.spi.data.readers.PrimaryKey; +import org.roaringbitmap.buffer.MutableRoaringBitmap; + + +/** + * Implementation of {@link PartitionUpsertMetadataManager} that is backed by a {@link ConcurrentHashMap} and ensures + * consistent deletions. This should be used when the table is configured with 'consistentDeletes' set to true. + */ +@SuppressWarnings({"rawtypes", "unchecked"}) +@ThreadSafe +public class ConcurrentMapPartitionUpsertMetadataManagerForConsistentDeletes + extends BasePartitionUpsertMetadataManager { + + @VisibleForTesting + final ConcurrentHashMap<Object, ConcurrentMapPartitionUpsertMetadataManagerForConsistentDeletes.RecordLocation> + _primaryKeyToRecordLocationMap = new ConcurrentHashMap<>(); + // Used to initialize a reference to previous row for merging in partial upsert + private final LazyRow _reusePreviousRow = new LazyRow(); + private final Map<String, Object> _reuseMergeResultHolder = new HashMap<>(); + + public ConcurrentMapPartitionUpsertMetadataManagerForConsistentDeletes(String tableNameWithType, int partitionId, + UpsertContext context) { + super(tableNameWithType, partitionId, context); + } + + @Override + protected long getNumPrimaryKeys() { + return _primaryKeyToRecordLocationMap.size(); + } + + @Override + protected void doAddOrReplaceSegment(ImmutableSegmentImpl segment, ThreadSafeMutableRoaringBitmap validDocIds, + @Nullable ThreadSafeMutableRoaringBitmap queryableDocIds, Iterator<RecordInfo> recordInfoIterator, + @Nullable IndexSegment oldSegment, @Nullable MutableRoaringBitmap validDocIdsForOldSegment) { + String segmentName = segment.getSegmentName(); + segment.enableUpsert(this, validDocIds, queryableDocIds); + + AtomicInteger numKeysInWrongSegment = new AtomicInteger(); + while (recordInfoIterator.hasNext()) { + RecordInfo recordInfo = recordInfoIterator.next(); + int newDocId = recordInfo.getDocId(); + Comparable newComparisonValue = recordInfo.getComparisonValue(); + _primaryKeyToRecordLocationMap.compute(HashUtils.hashPrimaryKey(recordInfo.getPrimaryKey(), _hashFunction), + (primaryKey, currentRecordLocation) -> { + if (currentRecordLocation != null) { + // Existing primary key + IndexSegment currentSegment = currentRecordLocation.getSegment(); + int currentDocId = currentRecordLocation.getDocId(); + Comparable currentComparisonValue = currentRecordLocation.getComparisonValue(); + int comparisonResult = newComparisonValue.compareTo(currentComparisonValue); + int currentDistinctSegmentCount = currentRecordLocation.getDistinctSegmentCount(); + + // The current record is in the same segment + // Update the record location when there is a tie to keep the newer record. Note that the record info + // iterator will return records with incremental doc ids. + if (currentSegment == segment) { + if (comparisonResult >= 0) { + replaceDocId(segment, validDocIds, queryableDocIds, currentDocId, newDocId, recordInfo); + return new ConcurrentMapPartitionUpsertMetadataManagerForConsistentDeletes.RecordLocation(segment, + newDocId, newComparisonValue, currentDistinctSegmentCount); + } else { + return currentRecordLocation; + } + } + + // The current record is in an old segment being replaced + // This could happen when committing a consuming segment, or reloading a completed segment. In this + // case, we want to update the record location when there is a tie because the record locations should + // point to the new added segment instead of the old segment being replaced. Also, do not update the valid + // doc ids for the old segment because it has not been replaced yet. We pass in an optional valid doc ids + // snapshot for the old segment, which can be updated and used to track the docs not replaced yet. + if (currentSegment == oldSegment) { + if (comparisonResult >= 0) { + addDocId(segment, validDocIds, queryableDocIds, newDocId, recordInfo); + if (validDocIdsForOldSegment != null) { + validDocIdsForOldSegment.remove(currentDocId); + } + return new RecordLocation(segment, newDocId, newComparisonValue, currentDistinctSegmentCount + 1); + } else { + return new RecordLocation(currentSegment, currentDocId, currentComparisonValue, + currentDistinctSegmentCount + 1); + } + } + + // This should not happen because the previously replaced segment should have all keys removed. We still + // handle it here, and also track the number of keys not properly replaced previously. + String currentSegmentName = currentSegment.getSegmentName(); + if (currentSegmentName.equals(segmentName)) { + numKeysInWrongSegment.getAndIncrement(); + if (comparisonResult >= 0) { + addDocId(segment, validDocIds, queryableDocIds, newDocId, recordInfo); + return new RecordLocation(segment, newDocId, newComparisonValue, currentDistinctSegmentCount + 1); + } else { + return currentRecordLocation; + } + } + + // The current record is in a different segment + // Update the record location when getting a newer comparison value, or the value is the same as the + // current value, but the segment has a larger sequence number (the segment is newer than the current + // segment). + if (comparisonResult > 0 || (comparisonResult == 0 && shouldReplaceOnComparisonTie(segmentName, + currentSegmentName, segment.getSegmentMetadata().getIndexCreationTime(), + currentSegment.getSegmentMetadata().getIndexCreationTime()))) { + replaceDocId(segment, validDocIds, queryableDocIds, currentSegment, currentDocId, newDocId, recordInfo); + return new RecordLocation(segment, newDocId, newComparisonValue, currentDistinctSegmentCount + 1); + } else { + return new RecordLocation(currentSegment, currentDocId, currentComparisonValue, + currentDistinctSegmentCount + 1); + } + } else { + // New primary key + addDocId(segment, validDocIds, queryableDocIds, newDocId, recordInfo); + return new RecordLocation(segment, newDocId, newComparisonValue, 1); + } + }); + } + int numKeys = numKeysInWrongSegment.get(); + if (numKeys > 0) { + _logger.warn("Found {} primary keys in the wrong segment when adding segment: {}", numKeys, segmentName); + _serverMetrics.addMeteredTableValue(_tableNameWithType, ServerMeter.UPSERT_KEYS_IN_WRONG_SEGMENT, numKeys); + } + } + + @Override + protected void addSegmentWithoutUpsert(ImmutableSegmentImpl segment, ThreadSafeMutableRoaringBitmap validDocIds, + @Nullable ThreadSafeMutableRoaringBitmap queryableDocIds, Iterator<RecordInfo> recordInfoIterator) { + segment.enableUpsert(this, validDocIds, queryableDocIds); Review Comment: Good point! -- This is an automated message from the Apache Git Service. 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