xiangfu0 commented on code in PR #19998: URL: https://github.com/apache/pinot/pull/19998#discussion_r4366789864
########## pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/index/metadata/MappedSegmentMetadataStore.java: ########## @@ -0,0 +1,904 @@ +/** + * 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.spi.index.metadata; + +import com.fasterxml.jackson.databind.node.ObjectNode; +import com.google.common.collect.Interner; +import com.google.common.collect.Interners; +import java.io.ByteArrayInputStream; +import java.io.ByteArrayOutputStream; +import java.io.Closeable; +import java.io.DataInputStream; +import java.io.DataOutputStream; +import java.io.File; +import java.io.IOException; +import java.math.BigDecimal; +import java.nio.ByteBuffer; +import java.nio.ByteOrder; +import java.nio.charset.StandardCharsets; +import java.nio.file.AtomicMoveNotSupportedException; +import java.nio.file.Files; +import java.nio.file.Path; +import java.nio.file.StandardCopyOption; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Comparator; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.stream.Collectors; +import java.util.zip.CRC32C; +import javax.annotation.Nullable; +import org.apache.commons.configuration2.Configuration; +import org.apache.commons.configuration2.PropertiesConfiguration; +import org.apache.commons.configuration2.ex.ConfigurationException; +import org.apache.pinot.segment.spi.ColumnMetadata; +import org.apache.pinot.segment.spi.V1Constants; +import org.apache.pinot.segment.spi.creator.SegmentVersion; +import org.apache.pinot.segment.spi.index.IndexService; +import org.apache.pinot.segment.spi.index.IndexType; +import org.apache.pinot.segment.spi.memory.PinotDataBuffer; +import org.apache.pinot.segment.spi.partition.PartitionFunction; +import org.apache.pinot.segment.spi.store.ColumnIndexUtils; +import org.apache.pinot.segment.spi.store.SegmentDirectoryPaths; +import org.apache.pinot.segment.spi.utils.SegmentMetadataUtils; +import org.apache.pinot.spi.config.table.FieldConfig.EncodingType; +import org.apache.pinot.spi.data.ComplexFieldSpec; +import org.apache.pinot.spi.data.FieldSpec; +import org.apache.pinot.spi.env.CommonsConfigurationUtils; +import org.apache.pinot.spi.utils.ByteArray; +import org.apache.pinot.spi.utils.ColumnNameInterner; +import org.apache.pinot.spi.utils.JsonUtils; + +/// Versioned, file-backed metadata for a sealed segment. The source `metadata.properties` remains the canonical +/// representation for old readers and preprocessing. +/// +/// The big-endian file starts with a 64-byte header containing the magic, format version, total length, source +/// `metadata.properties` and `index_map` length/CRC fingerprints, payload CRC, segment-property blob reference, +/// column count, and record-table bounds. Sorted columns occupy fixed 180-byte records, followed by variable blobs; +/// each blob reference is an absolute 32-bit offset and length. Numeric column statistics are read directly from the +/// mapping. The column layout retains names and reusable [FieldSpec] references on heap. +/// +/// A stale or corrupt sidecar is rebuilt from the canonical source and replaced locally, using atomic rename where +/// supported. Change `VERSION` whenever the encoding or the values derived from canonical metadata change; old +/// versions are rebuilt rather than migrated. +final class MappedSegmentMetadataStore implements Closeable { + static final String FILE_NAME = "segment_metadata.bin"; + private static final String TEMP_FILE_PREFIX = ".segment_metadata."; + private static final String TEMP_FILE_SUFFIX = ".tmp"; + + static boolean isSidecarFileName(String fileName) { + return FILE_NAME.equals(fileName) + || (fileName.startsWith(TEMP_FILE_PREFIX) && fileName.endsWith(TEMP_FILE_SUFFIX)); + } + + private static final int MAGIC = 0x504d4431; // PMD1 + private static final int VERSION = 4; + private static final int HEADER_SIZE = 64; + private static final int RECORD_SIZE = 180; + + static final int NAME = 0; + static final int FIELD_SPEC = 8; + static final int TOTAL_DOCS = 16; + static final int CARDINALITY = 20; + static final int FLAGS = 24; + static final int ENCODING = 28; + static final int SHORTEST = 32; + static final int LONGEST = 36; + static final int TOTAL_ENTRIES = 40; + static final int MAX_MV = 44; + static final int MAX_ROW = 48; + static final int BITS = 52; + static final int MIN_TAG = 56; + static final int MIN_RAW = 60; + static final int MIN_BLOB = 68; + static final int MAX_TAG = 76; + static final int MAX_RAW = 80; + static final int MAX_BLOB = 88; + static final int PARTITION_FUNCTION = 96; + static final int PARTITIONS = 104; + static final int PARENT = 112; + static final int SPARSE_KEYS = 120; + static final int SPARSE_MULTI_VALUE_KEYS = 128; + static final int SPARSE_KEY_TYPES = 136; + static final int RAW_UNCOMPRESSED_SIZE = 144; + static final int DICTIONARY_UNCOMPRESSED_SIZE = 152; + static final int COMPRESSION_TYPE = 160; + static final int INDEXES = 168; + static final int INDEX_COUNT = 176; + + static final int HAS_DICTIONARY = 1; + static final int SORTED = 1 << 1; + static final int NON_NULL = 1 << 2; + static final int INVALID_MIN_MAX = 1 << 3; + static final int ASCII = 1 << 4; + static final int AUTO_GENERATED = 1 << 5; + + private static final int NO_VALUE = 0; + private static final int INT_VALUE = 1; + private static final int LONG_VALUE = 2; + private static final int FLOAT_VALUE = 3; + private static final int DOUBLE_VALUE = 4; + private static final int DECIMAL_VALUE = 5; + private static final int STRING_VALUE = 6; + private static final int BYTES_VALUE = 7; + + private static final Interner<FieldSpec> FIELD_SPECS = Interners.newWeakInterner(); + private static final Interner<ColumnLayout> COLUMN_LAYOUTS = Interners.newWeakInterner(); + + private final PinotDataBuffer _buffer; + private final ColumnLayout _columns; + private final int _tableOffset; + private final int _segmentConfigOffset; + private final int _segmentConfigLength; + + private MappedSegmentMetadataStore(PinotDataBuffer buffer, ColumnLayout columns, int tableOffset, + int segmentConfigOffset, int segmentConfigLength) { + _buffer = buffer; + _columns = columns; + _tableOffset = tableOffset; + _segmentConfigOffset = segmentConfigOffset; + _segmentConfigLength = segmentConfigLength; + } + + static MappedSegmentMetadataStore open(File indexDir) + throws IOException, ConfigurationException { + File source = SegmentDirectoryPaths.findMetadataFile(indexDir); + if (source == null) { + throw new IOException("Missing metadata.properties in " + indexDir); + } + File sidecar = new File(indexDir, FILE_NAME); + boolean rebuilt = false; + for (int attempt = 0; attempt < 3; attempt++) { + Fingerprint propertiesFingerprint = Fingerprint.of(source); + Fingerprint indexMapFingerprint = Fingerprint.of(findIndexMap(indexDir)); + // The validated heap copy is transient; the store retains only the mapping and shared column layout. + byte[] bytes = readValid(sidecar, propertiesFingerprint, indexMapFingerprint); + if (bytes == null) { + writeAtomically(sidecar, build(indexDir, propertiesFingerprint, indexMapFingerprint)); + rebuilt = true; + bytes = readValid(sidecar, propertiesFingerprint, indexMapFingerprint); + if (bytes == null) { + continue; + } + } + PinotDataBuffer buffer = PinotDataBuffer.mapFile(sidecar, true, 0, bytes.length, ByteOrder.BIG_ENDIAN, + "segment metadata"); + boolean keepBuffer = false; + try { + // Another loader may atomically replace the sidecar between validation and mapFile(). Check the exact mapped + // bytes and the canonical inputs before publishing a view over this mapping. The header alone cannot prove + // that the mapped payload is the same bytes we validated. + if (!matchesMapped(buffer, bytes) || !propertiesFingerprint.sameAs(Fingerprint.of(source)) + || !indexMapFingerprint.sameAs(Fingerprint.of(findIndexMap(indexDir)))) { + continue; + } + ByteBuffer header = ByteBuffer.wrap(bytes).order(ByteOrder.BIG_ENDIAN); + int count = header.getInt(52); + int tableOffset = header.getInt(56); + String[] names = new String[count]; + FieldSpec[] fieldSpecs = new FieldSpec[count]; + for (int i = 0; i < count; i++) { + int record = tableOffset + i * RECORD_SIZE; + names[i] = ColumnNameInterner.intern(readString(bytes, header.getInt(record + NAME), + header.getInt(record + NAME + 4))); + FieldSpec parsed = JsonUtils.stringToObject(readString(bytes, header.getInt(record + FIELD_SPEC), + header.getInt(record + FIELD_SPEC + 4)), FieldSpec.class); + fieldSpecs[i] = parsed instanceof ComplexFieldSpec ? parsed : FIELD_SPECS.intern(parsed); + } + ColumnLayout columns = COLUMN_LAYOUTS.intern(new ColumnLayout(names, fieldSpecs)); + MappedSegmentMetadataStore store = new MappedSegmentMetadataStore(buffer, columns, tableOffset, + header.getInt(44), header.getInt(48)); + keepBuffer = true; + return store; + } catch (IOException | RuntimeException e) { + if (!rebuilt) { + // A checksum-valid older sidecar can still contain FieldSpec JSON this reader cannot parse. Rebuild it + // once from canonical metadata instead of falling back to eager on every load. + writeAtomically(sidecar, build(indexDir, propertiesFingerprint, indexMapFingerprint)); + rebuilt = true; + continue; + } + throw new IOException("Invalid field specs in mapped segment metadata: " + sidecar, e); + } finally { + if (!keepBuffer) { + buffer.close(); + } + } + } + throw new IOException("Metadata changed while mapping segment: " + indexDir); + } + + private static boolean matchesMapped(PinotDataBuffer buffer, byte[] bytes) { + if (buffer.size() != bytes.length) { + return false; + } + byte[] block = new byte[Math.min(8192, bytes.length)]; + for (int offset = 0; offset < bytes.length; offset += block.length) { + int length = Math.min(block.length, bytes.length - offset); + buffer.copyTo(offset, block, 0, length); + for (int i = 0; i < length; i++) { + if (block[i] != bytes[offset + i]) { + return false; + } + } + } + return true; + } + + int size() { + return _columns._names.length; + } + + String name(int ordinal) { + return _columns._names[ordinal]; + } + + int ordinal(String column) { + return Arrays.binarySearch(_columns._names, column); + } + + int getInt(int ordinal, int offset) { + return _buffer.getInt((long) _tableOffset + (long) ordinal * RECORD_SIZE + offset); + } + + long getLong(int ordinal, int offset) { + return _buffer.getLong((long) _tableOffset + (long) ordinal * RECORD_SIZE + offset); + } + + boolean flag(int ordinal, int flag) { + return (getInt(ordinal, FLAGS) & flag) != 0; + } + + @Nullable + String string(int ordinal, int field) { + byte[] bytes = blob(ordinal, field); + return bytes != null ? new String(bytes, StandardCharsets.UTF_8) : null; + } + + @Nullable + byte[] blob(int ordinal, int field) { + int offset = getInt(ordinal, field); + if (offset < 0) { + return null; + } + int length = getInt(ordinal, field + 4); + byte[] bytes = new byte[length]; + _buffer.copyTo(offset, bytes); + return bytes; + } + + FieldSpec fieldSpec(int ordinal) { + return _columns._fieldSpecs[ordinal]; + } + + @Nullable + Comparable<?> value(int ordinal, boolean minimum) { + int tag = getInt(ordinal, minimum ? MIN_TAG : MAX_TAG); + long raw = getLong(ordinal, minimum ? MIN_RAW : MAX_RAW); + int blobField = minimum ? MIN_BLOB : MAX_BLOB; + switch (tag) { + case NO_VALUE: + return null; + case INT_VALUE: + return (int) raw; + case LONG_VALUE: + return raw; + case FLOAT_VALUE: + return Float.intBitsToFloat((int) raw); + case DOUBLE_VALUE: + return Double.longBitsToDouble(raw); + case DECIMAL_VALUE: + return new BigDecimal(string(ordinal, blobField)); + case STRING_VALUE: + return string(ordinal, blobField); + case BYTES_VALUE: + return new ByteArray(blob(ordinal, blobField)); + default: + throw new IllegalStateException("Invalid value tag: " + tag); + } + } + + PropertiesConfiguration segmentConfiguration() + throws IOException, ConfigurationException { + byte[] bytes = new byte[_segmentConfigLength]; + _buffer.copyTo(_segmentConfigOffset, bytes); + // Values were already split by the source parser. A second delimiter pass would change escaped commas. + PropertiesConfiguration config = CommonsConfigurationUtils.fromInputStream(null, false, null); + try (DataInputStream input = new DataInputStream(new ByteArrayInputStream(bytes))) { + int count = input.readInt(); + for (int i = 0; i < count; i++) { + String key = readString(input); + int valueCount = input.readInt(); + if (valueCount == 1) { + config.setProperty(key, readString(input)); + } else { + List<String> values = new ArrayList<>(valueCount); + for (int j = 0; j < valueCount; j++) { + values.add(readString(input)); + } + config.setProperty(key, values); + } + } + } + return config; + } + + @Override + public void close() + throws IOException { + _buffer.close(); + } + + private static byte[] build(File indexDir, Fingerprint propertiesFingerprint, Fingerprint indexMapFingerprint) + throws IOException, ConfigurationException { + SegmentMetadataImpl source = new SegmentMetadataImpl(indexDir); + PropertiesConfiguration config = SegmentMetadataUtils.getPropertiesConfiguration(indexDir); + List<String> columns = new ArrayList<>(source.getColumnMetadataMap().keySet()); + columns.sort(Comparator.naturalOrder()); + if ((long) columns.size() * RECORD_SIZE + HEADER_SIZE > Integer.MAX_VALUE) { + throw new IOException("Too many columns for mapped metadata: " + columns.size()); + } + int blobBase = HEADER_SIZE + columns.size() * RECORD_SIZE; + BlobWriter blobs = new BlobWriter(blobBase); + BlobRef segmentConfig = blobs.add(encodeSegmentConfiguration(config)); + // EmptyColumnMetadata does not load index sizes even if a stale index_map is still present. + Map<String, List<IndexSize>> indexSizes = source.getTotalDocs() > 0 + && source.getVersion() == SegmentVersion.v3 ? readIndexSizes(indexDir) : Map.of(); + byte[] records = new byte[columns.size() * RECORD_SIZE]; + ByteBuffer recordBuffer = ByteBuffer.wrap(records).order(ByteOrder.BIG_ENDIAN); + for (int ordinal = 0; ordinal < columns.size(); ordinal++) { + String column = columns.get(ordinal); + ColumnMetadata metadata = source.getColumnMetadataFor(column); + int offset = ordinal * RECORD_SIZE; + putRef(recordBuffer, offset + NAME, blobs.add(column)); + putRef(recordBuffer, offset + FIELD_SPEC, blobs.add(fieldSpecJson(metadata.getFieldSpec()).toString())); + recordBuffer.putInt(offset + TOTAL_DOCS, metadata.getTotalDocs()); + recordBuffer.putInt(offset + CARDINALITY, metadata.getCardinality()); + int flags = (metadata.hasDictionary() ? HAS_DICTIONARY : 0) | (metadata.isSorted() ? SORTED : 0) + | (metadata.isNonNull() ? NON_NULL : 0) | (metadata.isMinMaxValueInvalid() ? INVALID_MIN_MAX : 0) + | (metadata.isAscii() ? ASCII : 0) | (metadata.isAutoGenerated() ? AUTO_GENERATED : 0); + recordBuffer.putInt(offset + FLAGS, flags); + EncodingType encoding = metadata.getForwardIndexEncoding(); + recordBuffer.putInt(offset + ENCODING, encoding == null ? 0 : encoding == EncodingType.RAW ? 1 : 2); + recordBuffer.putInt(offset + SHORTEST, metadata.getLengthOfShortestElement()); + recordBuffer.putInt(offset + LONGEST, metadata.getLengthOfLongestElement()); + recordBuffer.putInt(offset + TOTAL_ENTRIES, metadata.getTotalNumberOfEntries()); + recordBuffer.putInt(offset + MAX_MV, metadata.getMaxNumberOfMultiValues()); + recordBuffer.putInt(offset + MAX_ROW, metadata.getMaxRowLengthInBytes()); + recordBuffer.putInt(offset + BITS, metadata.getBitsPerElement()); + writeValue(recordBuffer, offset + MIN_TAG, offset + MIN_RAW, offset + MIN_BLOB, metadata.getMinValue(), blobs); + writeValue(recordBuffer, offset + MAX_TAG, offset + MAX_RAW, offset + MAX_BLOB, metadata.getMaxValue(), blobs); + PartitionFunction partitionFunction = metadata.getPartitionFunction(); + putRef(recordBuffer, offset + PARTITION_FUNCTION, + partitionFunction != null ? blobs.add(encodePartitionFunction(column, config)) : BlobRef.ABSENT); + putRef(recordBuffer, offset + PARTITIONS, + metadata.getPartitions() != null ? blobs.add(encodePartitions(metadata.getPartitions())) : BlobRef.ABSENT); + if (metadata instanceof ColumnMetadataImpl) { + ColumnMetadataImpl impl = (ColumnMetadataImpl) metadata; + putRef(recordBuffer, offset + PARENT, blobs.add(impl.getParentColumn())); + putRef(recordBuffer, offset + SPARSE_KEYS, blobs.addJson(impl.getSparseKeys())); + putRef(recordBuffer, offset + SPARSE_MULTI_VALUE_KEYS, blobs.addJson(impl.getSparseMultiValueKeys())); + putRef(recordBuffer, offset + SPARSE_KEY_TYPES, blobs.addJson(impl.getSparseKeyTypes())); + } else { + putRef(recordBuffer, offset + PARENT, BlobRef.ABSENT); + putRef(recordBuffer, offset + SPARSE_KEYS, BlobRef.ABSENT); + putRef(recordBuffer, offset + SPARSE_MULTI_VALUE_KEYS, BlobRef.ABSENT); + putRef(recordBuffer, offset + SPARSE_KEY_TYPES, BlobRef.ABSENT); + } + recordBuffer.putLong(offset + RAW_UNCOMPRESSED_SIZE, + metadata.getRawForwardIndexUncompressedValueSizeInBytes()); + recordBuffer.putLong(offset + DICTIONARY_UNCOMPRESSED_SIZE, + metadata.getDictionaryEncodedUncompressedValueSizeInBytes()); + putRef(recordBuffer, offset + COMPRESSION_TYPE, + blobs.add(metadata.getRawForwardIndexChunkCompressionType() != null + ? metadata.getRawForwardIndexChunkCompressionType().name() : null)); + List<IndexSize> sizes = indexSizes.getOrDefault(column, List.of()); + recordBuffer.putInt(offset + INDEX_COUNT, sizes.size()); + putRef(recordBuffer, offset + INDEXES, sizes.isEmpty() ? BlobRef.ABSENT : blobs.add(encodeIndexSizes(sizes))); + } + byte[] blobBytes = blobs.toByteArray(); + long totalSize = (long) HEADER_SIZE + records.length + blobBytes.length; + if (totalSize > Integer.MAX_VALUE) { + throw new IOException("Mapped metadata exceeds 2 GiB: " + totalSize); + } + byte[] bytes = new byte[(int) totalSize]; + ByteBuffer header = ByteBuffer.wrap(bytes).order(ByteOrder.BIG_ENDIAN); + header.putInt(0, MAGIC); + header.putInt(4, VERSION); + header.putLong(8, totalSize); + header.putLong(16, propertiesFingerprint._length); + header.putInt(24, propertiesFingerprint._crc); + header.putLong(28, indexMapFingerprint._length); + header.putInt(36, indexMapFingerprint._crc); + header.putInt(44, segmentConfig._offset); + header.putInt(48, segmentConfig._length); + header.putInt(52, columns.size()); + header.putInt(56, HEADER_SIZE); + header.putInt(60, blobBase); + System.arraycopy(records, 0, bytes, HEADER_SIZE, records.length); + System.arraycopy(blobBytes, 0, bytes, blobBase, blobBytes.length); + header.putInt(40, sidecarCrc(bytes)); + return bytes; + } + + private static ObjectNode fieldSpecJson(FieldSpec fieldSpec) { + ObjectNode json = fieldSpec.toJsonObject(); Review Comment: Fixed in 221d8cb5c6: numeric FieldSpec defaults are written as text, the sidecar format is v5, and eager/mapped regression coverage checks 1.10 and a high-precision decimal. Focused tests and affected style checks passed. ########## pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/index/metadata/MappedSegmentMetadataStore.java: ########## @@ -0,0 +1,904 @@ +/** + * 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.spi.index.metadata; + +import com.fasterxml.jackson.databind.node.ObjectNode; +import com.google.common.collect.Interner; +import com.google.common.collect.Interners; +import java.io.ByteArrayInputStream; +import java.io.ByteArrayOutputStream; +import java.io.Closeable; +import java.io.DataInputStream; +import java.io.DataOutputStream; +import java.io.File; +import java.io.IOException; +import java.math.BigDecimal; +import java.nio.ByteBuffer; +import java.nio.ByteOrder; +import java.nio.charset.StandardCharsets; +import java.nio.file.AtomicMoveNotSupportedException; +import java.nio.file.Files; +import java.nio.file.Path; +import java.nio.file.StandardCopyOption; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Comparator; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.stream.Collectors; +import java.util.zip.CRC32C; +import javax.annotation.Nullable; +import org.apache.commons.configuration2.Configuration; +import org.apache.commons.configuration2.PropertiesConfiguration; +import org.apache.commons.configuration2.ex.ConfigurationException; +import org.apache.pinot.segment.spi.ColumnMetadata; +import org.apache.pinot.segment.spi.V1Constants; +import org.apache.pinot.segment.spi.creator.SegmentVersion; +import org.apache.pinot.segment.spi.index.IndexService; +import org.apache.pinot.segment.spi.index.IndexType; +import org.apache.pinot.segment.spi.memory.PinotDataBuffer; +import org.apache.pinot.segment.spi.partition.PartitionFunction; +import org.apache.pinot.segment.spi.store.ColumnIndexUtils; +import org.apache.pinot.segment.spi.store.SegmentDirectoryPaths; +import org.apache.pinot.segment.spi.utils.SegmentMetadataUtils; +import org.apache.pinot.spi.config.table.FieldConfig.EncodingType; +import org.apache.pinot.spi.data.ComplexFieldSpec; +import org.apache.pinot.spi.data.FieldSpec; +import org.apache.pinot.spi.env.CommonsConfigurationUtils; +import org.apache.pinot.spi.utils.ByteArray; +import org.apache.pinot.spi.utils.ColumnNameInterner; +import org.apache.pinot.spi.utils.JsonUtils; + +/// Versioned, file-backed metadata for a sealed segment. The source `metadata.properties` remains the canonical +/// representation for old readers and preprocessing. +/// +/// The big-endian file starts with a 64-byte header containing the magic, format version, total length, source +/// `metadata.properties` and `index_map` length/CRC fingerprints, payload CRC, segment-property blob reference, +/// column count, and record-table bounds. Sorted columns occupy fixed 180-byte records, followed by variable blobs; +/// each blob reference is an absolute 32-bit offset and length. Numeric column statistics are read directly from the +/// mapping. The column layout retains names and reusable [FieldSpec] references on heap. +/// +/// A stale or corrupt sidecar is rebuilt from the canonical source and replaced locally, using atomic rename where +/// supported. Change `VERSION` whenever the encoding or the values derived from canonical metadata change; old +/// versions are rebuilt rather than migrated. +final class MappedSegmentMetadataStore implements Closeable { + static final String FILE_NAME = "segment_metadata.bin"; + private static final String TEMP_FILE_PREFIX = ".segment_metadata."; + private static final String TEMP_FILE_SUFFIX = ".tmp"; + + static boolean isSidecarFileName(String fileName) { + return FILE_NAME.equals(fileName) + || (fileName.startsWith(TEMP_FILE_PREFIX) && fileName.endsWith(TEMP_FILE_SUFFIX)); + } + + private static final int MAGIC = 0x504d4431; // PMD1 + private static final int VERSION = 4; + private static final int HEADER_SIZE = 64; + private static final int RECORD_SIZE = 180; + + static final int NAME = 0; + static final int FIELD_SPEC = 8; + static final int TOTAL_DOCS = 16; + static final int CARDINALITY = 20; + static final int FLAGS = 24; + static final int ENCODING = 28; + static final int SHORTEST = 32; + static final int LONGEST = 36; + static final int TOTAL_ENTRIES = 40; + static final int MAX_MV = 44; + static final int MAX_ROW = 48; + static final int BITS = 52; + static final int MIN_TAG = 56; + static final int MIN_RAW = 60; + static final int MIN_BLOB = 68; + static final int MAX_TAG = 76; + static final int MAX_RAW = 80; + static final int MAX_BLOB = 88; + static final int PARTITION_FUNCTION = 96; + static final int PARTITIONS = 104; + static final int PARENT = 112; + static final int SPARSE_KEYS = 120; + static final int SPARSE_MULTI_VALUE_KEYS = 128; + static final int SPARSE_KEY_TYPES = 136; + static final int RAW_UNCOMPRESSED_SIZE = 144; + static final int DICTIONARY_UNCOMPRESSED_SIZE = 152; + static final int COMPRESSION_TYPE = 160; + static final int INDEXES = 168; + static final int INDEX_COUNT = 176; + + static final int HAS_DICTIONARY = 1; + static final int SORTED = 1 << 1; + static final int NON_NULL = 1 << 2; + static final int INVALID_MIN_MAX = 1 << 3; + static final int ASCII = 1 << 4; + static final int AUTO_GENERATED = 1 << 5; + + private static final int NO_VALUE = 0; + private static final int INT_VALUE = 1; + private static final int LONG_VALUE = 2; + private static final int FLOAT_VALUE = 3; + private static final int DOUBLE_VALUE = 4; + private static final int DECIMAL_VALUE = 5; + private static final int STRING_VALUE = 6; + private static final int BYTES_VALUE = 7; + + private static final Interner<FieldSpec> FIELD_SPECS = Interners.newWeakInterner(); + private static final Interner<ColumnLayout> COLUMN_LAYOUTS = Interners.newWeakInterner(); + + private final PinotDataBuffer _buffer; + private final ColumnLayout _columns; + private final int _tableOffset; + private final int _segmentConfigOffset; + private final int _segmentConfigLength; + + private MappedSegmentMetadataStore(PinotDataBuffer buffer, ColumnLayout columns, int tableOffset, + int segmentConfigOffset, int segmentConfigLength) { + _buffer = buffer; + _columns = columns; + _tableOffset = tableOffset; + _segmentConfigOffset = segmentConfigOffset; + _segmentConfigLength = segmentConfigLength; + } + + static MappedSegmentMetadataStore open(File indexDir) + throws IOException, ConfigurationException { + File source = SegmentDirectoryPaths.findMetadataFile(indexDir); + if (source == null) { + throw new IOException("Missing metadata.properties in " + indexDir); + } + File sidecar = new File(indexDir, FILE_NAME); + boolean rebuilt = false; + for (int attempt = 0; attempt < 3; attempt++) { + Fingerprint propertiesFingerprint = Fingerprint.of(source); + Fingerprint indexMapFingerprint = Fingerprint.of(findIndexMap(indexDir)); + // The validated heap copy is transient; the store retains only the mapping and shared column layout. + byte[] bytes = readValid(sidecar, propertiesFingerprint, indexMapFingerprint); + if (bytes == null) { + writeAtomically(sidecar, build(indexDir, propertiesFingerprint, indexMapFingerprint)); + rebuilt = true; + bytes = readValid(sidecar, propertiesFingerprint, indexMapFingerprint); + if (bytes == null) { + continue; + } + } + PinotDataBuffer buffer = PinotDataBuffer.mapFile(sidecar, true, 0, bytes.length, ByteOrder.BIG_ENDIAN, + "segment metadata"); + boolean keepBuffer = false; + try { + // Another loader may atomically replace the sidecar between validation and mapFile(). Check the exact mapped + // bytes and the canonical inputs before publishing a view over this mapping. The header alone cannot prove + // that the mapped payload is the same bytes we validated. + if (!matchesMapped(buffer, bytes) || !propertiesFingerprint.sameAs(Fingerprint.of(source)) + || !indexMapFingerprint.sameAs(Fingerprint.of(findIndexMap(indexDir)))) { + continue; + } + ByteBuffer header = ByteBuffer.wrap(bytes).order(ByteOrder.BIG_ENDIAN); + int count = header.getInt(52); + int tableOffset = header.getInt(56); + String[] names = new String[count]; + FieldSpec[] fieldSpecs = new FieldSpec[count]; + for (int i = 0; i < count; i++) { + int record = tableOffset + i * RECORD_SIZE; + names[i] = ColumnNameInterner.intern(readString(bytes, header.getInt(record + NAME), + header.getInt(record + NAME + 4))); + FieldSpec parsed = JsonUtils.stringToObject(readString(bytes, header.getInt(record + FIELD_SPEC), + header.getInt(record + FIELD_SPEC + 4)), FieldSpec.class); + fieldSpecs[i] = parsed instanceof ComplexFieldSpec ? parsed : FIELD_SPECS.intern(parsed); + } + ColumnLayout columns = COLUMN_LAYOUTS.intern(new ColumnLayout(names, fieldSpecs)); + MappedSegmentMetadataStore store = new MappedSegmentMetadataStore(buffer, columns, tableOffset, + header.getInt(44), header.getInt(48)); + keepBuffer = true; + return store; + } catch (IOException | RuntimeException e) { + if (!rebuilt) { + // A checksum-valid older sidecar can still contain FieldSpec JSON this reader cannot parse. Rebuild it + // once from canonical metadata instead of falling back to eager on every load. + writeAtomically(sidecar, build(indexDir, propertiesFingerprint, indexMapFingerprint)); + rebuilt = true; + continue; + } + throw new IOException("Invalid field specs in mapped segment metadata: " + sidecar, e); + } finally { + if (!keepBuffer) { + buffer.close(); + } + } + } + throw new IOException("Metadata changed while mapping segment: " + indexDir); + } + + private static boolean matchesMapped(PinotDataBuffer buffer, byte[] bytes) { + if (buffer.size() != bytes.length) { + return false; + } + byte[] block = new byte[Math.min(8192, bytes.length)]; + for (int offset = 0; offset < bytes.length; offset += block.length) { + int length = Math.min(block.length, bytes.length - offset); + buffer.copyTo(offset, block, 0, length); + for (int i = 0; i < length; i++) { + if (block[i] != bytes[offset + i]) { + return false; + } + } + } + return true; + } + + int size() { + return _columns._names.length; + } + + String name(int ordinal) { + return _columns._names[ordinal]; + } + + int ordinal(String column) { + return Arrays.binarySearch(_columns._names, column); + } + + int getInt(int ordinal, int offset) { + return _buffer.getInt((long) _tableOffset + (long) ordinal * RECORD_SIZE + offset); + } + + long getLong(int ordinal, int offset) { + return _buffer.getLong((long) _tableOffset + (long) ordinal * RECORD_SIZE + offset); + } + + boolean flag(int ordinal, int flag) { + return (getInt(ordinal, FLAGS) & flag) != 0; + } + + @Nullable + String string(int ordinal, int field) { + byte[] bytes = blob(ordinal, field); + return bytes != null ? new String(bytes, StandardCharsets.UTF_8) : null; + } + + @Nullable + byte[] blob(int ordinal, int field) { + int offset = getInt(ordinal, field); + if (offset < 0) { + return null; + } + int length = getInt(ordinal, field + 4); + byte[] bytes = new byte[length]; + _buffer.copyTo(offset, bytes); + return bytes; + } + + FieldSpec fieldSpec(int ordinal) { + return _columns._fieldSpecs[ordinal]; + } + + @Nullable + Comparable<?> value(int ordinal, boolean minimum) { + int tag = getInt(ordinal, minimum ? MIN_TAG : MAX_TAG); + long raw = getLong(ordinal, minimum ? MIN_RAW : MAX_RAW); + int blobField = minimum ? MIN_BLOB : MAX_BLOB; + switch (tag) { + case NO_VALUE: + return null; + case INT_VALUE: + return (int) raw; + case LONG_VALUE: + return raw; + case FLOAT_VALUE: + return Float.intBitsToFloat((int) raw); + case DOUBLE_VALUE: + return Double.longBitsToDouble(raw); + case DECIMAL_VALUE: + return new BigDecimal(string(ordinal, blobField)); + case STRING_VALUE: + return string(ordinal, blobField); + case BYTES_VALUE: + return new ByteArray(blob(ordinal, blobField)); + default: + throw new IllegalStateException("Invalid value tag: " + tag); + } + } + + PropertiesConfiguration segmentConfiguration() + throws IOException, ConfigurationException { + byte[] bytes = new byte[_segmentConfigLength]; + _buffer.copyTo(_segmentConfigOffset, bytes); + // Values were already split by the source parser. A second delimiter pass would change escaped commas. + PropertiesConfiguration config = CommonsConfigurationUtils.fromInputStream(null, false, null); + try (DataInputStream input = new DataInputStream(new ByteArrayInputStream(bytes))) { + int count = input.readInt(); + for (int i = 0; i < count; i++) { + String key = readString(input); + int valueCount = input.readInt(); + if (valueCount == 1) { + config.setProperty(key, readString(input)); + } else { + List<String> values = new ArrayList<>(valueCount); + for (int j = 0; j < valueCount; j++) { + values.add(readString(input)); + } + config.setProperty(key, values); + } + } + } + return config; + } + + @Override + public void close() + throws IOException { + _buffer.close(); + } + + private static byte[] build(File indexDir, Fingerprint propertiesFingerprint, Fingerprint indexMapFingerprint) + throws IOException, ConfigurationException { + SegmentMetadataImpl source = new SegmentMetadataImpl(indexDir); + PropertiesConfiguration config = SegmentMetadataUtils.getPropertiesConfiguration(indexDir); + List<String> columns = new ArrayList<>(source.getColumnMetadataMap().keySet()); + columns.sort(Comparator.naturalOrder()); + if ((long) columns.size() * RECORD_SIZE + HEADER_SIZE > Integer.MAX_VALUE) { + throw new IOException("Too many columns for mapped metadata: " + columns.size()); + } + int blobBase = HEADER_SIZE + columns.size() * RECORD_SIZE; + BlobWriter blobs = new BlobWriter(blobBase); + BlobRef segmentConfig = blobs.add(encodeSegmentConfiguration(config)); + // EmptyColumnMetadata does not load index sizes even if a stale index_map is still present. + Map<String, List<IndexSize>> indexSizes = source.getTotalDocs() > 0 + && source.getVersion() == SegmentVersion.v3 ? readIndexSizes(indexDir) : Map.of(); + byte[] records = new byte[columns.size() * RECORD_SIZE]; + ByteBuffer recordBuffer = ByteBuffer.wrap(records).order(ByteOrder.BIG_ENDIAN); + for (int ordinal = 0; ordinal < columns.size(); ordinal++) { + String column = columns.get(ordinal); + ColumnMetadata metadata = source.getColumnMetadataFor(column); + int offset = ordinal * RECORD_SIZE; + putRef(recordBuffer, offset + NAME, blobs.add(column)); + putRef(recordBuffer, offset + FIELD_SPEC, blobs.add(fieldSpecJson(metadata.getFieldSpec()).toString())); + recordBuffer.putInt(offset + TOTAL_DOCS, metadata.getTotalDocs()); + recordBuffer.putInt(offset + CARDINALITY, metadata.getCardinality()); + int flags = (metadata.hasDictionary() ? HAS_DICTIONARY : 0) | (metadata.isSorted() ? SORTED : 0) + | (metadata.isNonNull() ? NON_NULL : 0) | (metadata.isMinMaxValueInvalid() ? INVALID_MIN_MAX : 0) + | (metadata.isAscii() ? ASCII : 0) | (metadata.isAutoGenerated() ? AUTO_GENERATED : 0); + recordBuffer.putInt(offset + FLAGS, flags); + EncodingType encoding = metadata.getForwardIndexEncoding(); + recordBuffer.putInt(offset + ENCODING, encoding == null ? 0 : encoding == EncodingType.RAW ? 1 : 2); + recordBuffer.putInt(offset + SHORTEST, metadata.getLengthOfShortestElement()); + recordBuffer.putInt(offset + LONGEST, metadata.getLengthOfLongestElement()); + recordBuffer.putInt(offset + TOTAL_ENTRIES, metadata.getTotalNumberOfEntries()); + recordBuffer.putInt(offset + MAX_MV, metadata.getMaxNumberOfMultiValues()); + recordBuffer.putInt(offset + MAX_ROW, metadata.getMaxRowLengthInBytes()); + recordBuffer.putInt(offset + BITS, metadata.getBitsPerElement()); + writeValue(recordBuffer, offset + MIN_TAG, offset + MIN_RAW, offset + MIN_BLOB, metadata.getMinValue(), blobs); + writeValue(recordBuffer, offset + MAX_TAG, offset + MAX_RAW, offset + MAX_BLOB, metadata.getMaxValue(), blobs); + PartitionFunction partitionFunction = metadata.getPartitionFunction(); + putRef(recordBuffer, offset + PARTITION_FUNCTION, + partitionFunction != null ? blobs.add(encodePartitionFunction(column, config)) : BlobRef.ABSENT); + putRef(recordBuffer, offset + PARTITIONS, + metadata.getPartitions() != null ? blobs.add(encodePartitions(metadata.getPartitions())) : BlobRef.ABSENT); + if (metadata instanceof ColumnMetadataImpl) { + ColumnMetadataImpl impl = (ColumnMetadataImpl) metadata; + putRef(recordBuffer, offset + PARENT, blobs.add(impl.getParentColumn())); + putRef(recordBuffer, offset + SPARSE_KEYS, blobs.addJson(impl.getSparseKeys())); + putRef(recordBuffer, offset + SPARSE_MULTI_VALUE_KEYS, blobs.addJson(impl.getSparseMultiValueKeys())); + putRef(recordBuffer, offset + SPARSE_KEY_TYPES, blobs.addJson(impl.getSparseKeyTypes())); + } else { + putRef(recordBuffer, offset + PARENT, BlobRef.ABSENT); + putRef(recordBuffer, offset + SPARSE_KEYS, BlobRef.ABSENT); + putRef(recordBuffer, offset + SPARSE_MULTI_VALUE_KEYS, BlobRef.ABSENT); + putRef(recordBuffer, offset + SPARSE_KEY_TYPES, BlobRef.ABSENT); + } + recordBuffer.putLong(offset + RAW_UNCOMPRESSED_SIZE, + metadata.getRawForwardIndexUncompressedValueSizeInBytes()); + recordBuffer.putLong(offset + DICTIONARY_UNCOMPRESSED_SIZE, + metadata.getDictionaryEncodedUncompressedValueSizeInBytes()); + putRef(recordBuffer, offset + COMPRESSION_TYPE, + blobs.add(metadata.getRawForwardIndexChunkCompressionType() != null + ? metadata.getRawForwardIndexChunkCompressionType().name() : null)); + List<IndexSize> sizes = indexSizes.getOrDefault(column, List.of()); + recordBuffer.putInt(offset + INDEX_COUNT, sizes.size()); + putRef(recordBuffer, offset + INDEXES, sizes.isEmpty() ? BlobRef.ABSENT : blobs.add(encodeIndexSizes(sizes))); + } + byte[] blobBytes = blobs.toByteArray(); + long totalSize = (long) HEADER_SIZE + records.length + blobBytes.length; + if (totalSize > Integer.MAX_VALUE) { + throw new IOException("Mapped metadata exceeds 2 GiB: " + totalSize); + } + byte[] bytes = new byte[(int) totalSize]; + ByteBuffer header = ByteBuffer.wrap(bytes).order(ByteOrder.BIG_ENDIAN); + header.putInt(0, MAGIC); + header.putInt(4, VERSION); + header.putLong(8, totalSize); + header.putLong(16, propertiesFingerprint._length); + header.putInt(24, propertiesFingerprint._crc); + header.putLong(28, indexMapFingerprint._length); + header.putInt(36, indexMapFingerprint._crc); + header.putInt(44, segmentConfig._offset); + header.putInt(48, segmentConfig._length); + header.putInt(52, columns.size()); + header.putInt(56, HEADER_SIZE); + header.putInt(60, blobBase); + System.arraycopy(records, 0, bytes, HEADER_SIZE, records.length); + System.arraycopy(blobBytes, 0, bytes, blobBase, blobBytes.length); + header.putInt(40, sidecarCrc(bytes)); + return bytes; + } + + private static ObjectNode fieldSpecJson(FieldSpec fieldSpec) { + ObjectNode json = fieldSpec.toJsonObject(); + // TimeFieldSpec omits the discriminator, including when nested in a ComplexFieldSpec. + json.put("fieldType", fieldSpec.getFieldType().toString()); + if (fieldSpec instanceof ComplexFieldSpec) { + ObjectNode children = (ObjectNode) json.get("childFieldSpecs"); + for (Map.Entry<String, FieldSpec> entry : ((ComplexFieldSpec) fieldSpec).getChildFieldSpecs().entrySet()) { + children.set(entry.getKey(), fieldSpecJson(entry.getValue())); + } + } + return json; + } + + private static byte[] encodeSegmentConfiguration(PropertiesConfiguration config) + throws IOException { + ByteArrayOutputStream bytes = new ByteArrayOutputStream(); + try (DataOutputStream output = new DataOutputStream(bytes)) { + List<String> keys = CommonsConfigurationUtils.getKeys(config).stream() + .filter(key -> !key.startsWith(V1Constants.MetadataKeys.Column.COLUMN_PROPS_KEY_PREFIX)) + .sorted().collect(Collectors.toList()); + output.writeInt(keys.size()); + for (String key : keys) { + writeString(output, key); + Object value = config.getProperty(key); + if (value instanceof List<?>) { + List<?> values = (List<?>) value; + output.writeInt(values.size()); + for (Object entry : values) { + writeString(output, String.valueOf(entry)); + } + } else { + output.writeInt(1); + writeString(output, String.valueOf(value)); + } + } + } + return bytes.toByteArray(); + } + + private static byte[] encodePartitionFunction(String column, PropertiesConfiguration metadata) + throws IOException { + String prefix = V1Constants.MetadataKeys.Column.COLUMN_PROPS_KEY_PREFIX + column + "."; + String name = metadata.getString(prefix + V1Constants.MetadataKeys.Column.PARTITION_FUNCTION); + int numPartitions = metadata.getInt(prefix + V1Constants.MetadataKeys.Column.NUM_PARTITIONS); + Configuration functionConfig = metadata.subset(prefix + V1Constants.MetadataKeys.Column.PARTITION_FUNCTION_CONFIG); + Map<String, String> config = new HashMap<>(); + functionConfig.forEach((key, value) -> config.put(key, + value instanceof List ? ((List<?>) value).stream().map(String::valueOf).collect(Collectors.joining(",")) + : value.toString())); + ByteArrayOutputStream bytes = new ByteArrayOutputStream(); + try (DataOutputStream output = new DataOutputStream(bytes)) { + writeString(output, name); + output.writeInt(numPartitions); + output.writeInt(config.size()); + for (String key : config.keySet().stream().sorted().collect(Collectors.toList())) { + writeString(output, key); + writeString(output, config.get(key)); + } + } + return bytes.toByteArray(); + } + + private static byte[] encodePartitions(Set<Integer> partitions) + throws IOException { + ByteArrayOutputStream bytes = new ByteArrayOutputStream(); + try (DataOutputStream output = new DataOutputStream(bytes)) { + output.writeInt(partitions.size()); + for (int partition : partitions.stream().sorted().collect(Collectors.toList())) { + output.writeInt(partition); + } + } + return bytes.toByteArray(); + } + + private static byte[] encodeIndexSizes(List<IndexSize> sizes) + throws IOException { + ByteArrayOutputStream bytes = new ByteArrayOutputStream(); + try (DataOutputStream output = new DataOutputStream(bytes)) { + for (IndexSize size : sizes) { + writeString(output, size._type); + output.writeLong(size._size); + } + } + return bytes.toByteArray(); + } + + private static Map<String, List<IndexSize>> readIndexSizes(File indexDir) + throws ConfigurationException { + File indexMap = findIndexMap(indexDir); + if (indexMap == null) { + return Map.of(); + } + // Match SegmentMetadataImpl: index sizes come only from the local v3 index_map. + PropertiesConfiguration config = CommonsConfigurationUtils.fromFile(indexMap); + Map<String, List<IndexSize>> result = new HashMap<>(); + for (String key : CommonsConfigurationUtils.getKeys(config)) { + try { + String[] parsed = ColumnIndexUtils.parseIndexMapKeys(key, indexDir.getPath()); + if (ColumnIndexUtils.MAP_KEY_NAME_SIZE.equals(parsed[2])) { + long size = config.getLong(key); + if (size < 0 || size > (1L << 48) - 1) { + continue; + } + IndexType<?, ?, ?> type = IndexService.getInstance().get(parsed[1]); Review Comment: Fixed in 221d8cb5c6: the sidecar index-map fingerprint now includes registered index IDs. A focused test verifies that adding a previously unknown type rebuilds the sidecar and restores its index size. ########## pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/index/metadata/MappedSegmentMetadataStore.java: ########## @@ -0,0 +1,904 @@ +/** + * 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.spi.index.metadata; + +import com.fasterxml.jackson.databind.node.ObjectNode; +import com.google.common.collect.Interner; +import com.google.common.collect.Interners; +import java.io.ByteArrayInputStream; +import java.io.ByteArrayOutputStream; +import java.io.Closeable; +import java.io.DataInputStream; +import java.io.DataOutputStream; +import java.io.File; +import java.io.IOException; +import java.math.BigDecimal; +import java.nio.ByteBuffer; +import java.nio.ByteOrder; +import java.nio.charset.StandardCharsets; +import java.nio.file.AtomicMoveNotSupportedException; +import java.nio.file.Files; +import java.nio.file.Path; +import java.nio.file.StandardCopyOption; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Comparator; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.stream.Collectors; +import java.util.zip.CRC32C; +import javax.annotation.Nullable; +import org.apache.commons.configuration2.Configuration; +import org.apache.commons.configuration2.PropertiesConfiguration; +import org.apache.commons.configuration2.ex.ConfigurationException; +import org.apache.pinot.segment.spi.ColumnMetadata; +import org.apache.pinot.segment.spi.V1Constants; +import org.apache.pinot.segment.spi.creator.SegmentVersion; +import org.apache.pinot.segment.spi.index.IndexService; +import org.apache.pinot.segment.spi.index.IndexType; +import org.apache.pinot.segment.spi.memory.PinotDataBuffer; +import org.apache.pinot.segment.spi.partition.PartitionFunction; +import org.apache.pinot.segment.spi.store.ColumnIndexUtils; +import org.apache.pinot.segment.spi.store.SegmentDirectoryPaths; +import org.apache.pinot.segment.spi.utils.SegmentMetadataUtils; +import org.apache.pinot.spi.config.table.FieldConfig.EncodingType; +import org.apache.pinot.spi.data.ComplexFieldSpec; +import org.apache.pinot.spi.data.FieldSpec; +import org.apache.pinot.spi.env.CommonsConfigurationUtils; +import org.apache.pinot.spi.utils.ByteArray; +import org.apache.pinot.spi.utils.ColumnNameInterner; +import org.apache.pinot.spi.utils.JsonUtils; + +/// Versioned, file-backed metadata for a sealed segment. The source `metadata.properties` remains the canonical +/// representation for old readers and preprocessing. +/// +/// The big-endian file starts with a 64-byte header containing the magic, format version, total length, source +/// `metadata.properties` and `index_map` length/CRC fingerprints, payload CRC, segment-property blob reference, +/// column count, and record-table bounds. Sorted columns occupy fixed 180-byte records, followed by variable blobs; +/// each blob reference is an absolute 32-bit offset and length. Numeric column statistics are read directly from the +/// mapping. The column layout retains names and reusable [FieldSpec] references on heap. +/// +/// A stale or corrupt sidecar is rebuilt from the canonical source and replaced locally, using atomic rename where +/// supported. Change `VERSION` whenever the encoding or the values derived from canonical metadata change; old +/// versions are rebuilt rather than migrated. +final class MappedSegmentMetadataStore implements Closeable { + static final String FILE_NAME = "segment_metadata.bin"; + private static final String TEMP_FILE_PREFIX = ".segment_metadata."; + private static final String TEMP_FILE_SUFFIX = ".tmp"; + + static boolean isSidecarFileName(String fileName) { + return FILE_NAME.equals(fileName) + || (fileName.startsWith(TEMP_FILE_PREFIX) && fileName.endsWith(TEMP_FILE_SUFFIX)); + } + + private static final int MAGIC = 0x504d4431; // PMD1 + private static final int VERSION = 4; + private static final int HEADER_SIZE = 64; + private static final int RECORD_SIZE = 180; + + static final int NAME = 0; + static final int FIELD_SPEC = 8; + static final int TOTAL_DOCS = 16; + static final int CARDINALITY = 20; + static final int FLAGS = 24; + static final int ENCODING = 28; + static final int SHORTEST = 32; + static final int LONGEST = 36; + static final int TOTAL_ENTRIES = 40; + static final int MAX_MV = 44; + static final int MAX_ROW = 48; + static final int BITS = 52; + static final int MIN_TAG = 56; + static final int MIN_RAW = 60; + static final int MIN_BLOB = 68; + static final int MAX_TAG = 76; + static final int MAX_RAW = 80; + static final int MAX_BLOB = 88; + static final int PARTITION_FUNCTION = 96; + static final int PARTITIONS = 104; + static final int PARENT = 112; + static final int SPARSE_KEYS = 120; + static final int SPARSE_MULTI_VALUE_KEYS = 128; + static final int SPARSE_KEY_TYPES = 136; + static final int RAW_UNCOMPRESSED_SIZE = 144; + static final int DICTIONARY_UNCOMPRESSED_SIZE = 152; + static final int COMPRESSION_TYPE = 160; + static final int INDEXES = 168; + static final int INDEX_COUNT = 176; + + static final int HAS_DICTIONARY = 1; + static final int SORTED = 1 << 1; + static final int NON_NULL = 1 << 2; + static final int INVALID_MIN_MAX = 1 << 3; + static final int ASCII = 1 << 4; + static final int AUTO_GENERATED = 1 << 5; + + private static final int NO_VALUE = 0; + private static final int INT_VALUE = 1; + private static final int LONG_VALUE = 2; + private static final int FLOAT_VALUE = 3; + private static final int DOUBLE_VALUE = 4; + private static final int DECIMAL_VALUE = 5; + private static final int STRING_VALUE = 6; + private static final int BYTES_VALUE = 7; + + private static final Interner<FieldSpec> FIELD_SPECS = Interners.newWeakInterner(); + private static final Interner<ColumnLayout> COLUMN_LAYOUTS = Interners.newWeakInterner(); + + private final PinotDataBuffer _buffer; + private final ColumnLayout _columns; + private final int _tableOffset; + private final int _segmentConfigOffset; + private final int _segmentConfigLength; + + private MappedSegmentMetadataStore(PinotDataBuffer buffer, ColumnLayout columns, int tableOffset, + int segmentConfigOffset, int segmentConfigLength) { + _buffer = buffer; + _columns = columns; + _tableOffset = tableOffset; + _segmentConfigOffset = segmentConfigOffset; + _segmentConfigLength = segmentConfigLength; + } + + static MappedSegmentMetadataStore open(File indexDir) + throws IOException, ConfigurationException { + File source = SegmentDirectoryPaths.findMetadataFile(indexDir); + if (source == null) { + throw new IOException("Missing metadata.properties in " + indexDir); + } + File sidecar = new File(indexDir, FILE_NAME); + boolean rebuilt = false; + for (int attempt = 0; attempt < 3; attempt++) { + Fingerprint propertiesFingerprint = Fingerprint.of(source); + Fingerprint indexMapFingerprint = Fingerprint.of(findIndexMap(indexDir)); + // The validated heap copy is transient; the store retains only the mapping and shared column layout. + byte[] bytes = readValid(sidecar, propertiesFingerprint, indexMapFingerprint); + if (bytes == null) { + writeAtomically(sidecar, build(indexDir, propertiesFingerprint, indexMapFingerprint)); + rebuilt = true; + bytes = readValid(sidecar, propertiesFingerprint, indexMapFingerprint); + if (bytes == null) { + continue; + } + } + PinotDataBuffer buffer = PinotDataBuffer.mapFile(sidecar, true, 0, bytes.length, ByteOrder.BIG_ENDIAN, Review Comment: Fixed in 221d8cb5c6: serving loads pass ReadMode through to the sidecar; HEAP mode uses a direct buffer instead of a file mapping, including for empty segments. The HEAP serving-load test passed. ########## pinot-segment-local/src/main/java/org/apache/pinot/segment/local/upsert/BasePartitionUpsertMetadataManager.java: ########## @@ -1001,9 +1001,21 @@ private void recordSnapshotPass(boolean consistent) { TreeMap<String, Long> segmentVersions = new TreeMap<>(); for (IndexSegment segment : _trackedSegments) { if (segment instanceof ImmutableSegmentImpl) { - SegmentMetadata segmentMetadata = segment.getSegmentMetadata(); - long dataCrc = segmentMetadata.getDataCrc(); - segmentVersions.put(segment.getSegmentName(), dataCrc >= 0 ? dataCrc : segmentMetadata.getCrc()); + if (!tryAcquireSegmentReadLock(segment)) { Review Comment: Removed the snapshot-pass read lock and its lock-specific test in 221d8cb5c6. The pass reads stable heap metadata fields; the existing operation counters still detect overlapping segment changes. The focused upsert tests passed. -- This is an automated message from the Apache Git Service. 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