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/*
* 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.util;
import org.apache.hudi.avro.HoodieAvroUtils;
import org.apache.hudi.common.fs.FSUtils;
import org.apache.hudi.common.model.HoodieFileFormat;
import org.apache.hudi.common.model.HoodieKey;
import org.apache.hudi.common.model.HoodieRecord;
import org.apache.hudi.exception.HoodieException;
import org.apache.hudi.exception.HoodieIOException;
import org.apache.hudi.exception.MetadataNotFoundException;
import org.apache.hudi.keygen.BaseKeyGenerator;
import org.apache.avro.Schema;
import org.apache.avro.generic.GenericRecord;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.ql.exec.vector.BytesColumnVector;
import org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch;
import org.apache.orc.OrcFile;
import org.apache.orc.OrcProto.UserMetadataItem;
import org.apache.orc.Reader;
import org.apache.orc.Reader.Options;
import org.apache.orc.RecordReader;
import org.apache.orc.TypeDescription;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import static org.apache.hudi.common.util.BinaryUtil.toBytes;
/**
* Utility functions for ORC files.
*/
public class OrcUtils extends BaseFileUtils {
/**
* Provides a closable iterator for reading the given ORC file.
*
* @param configuration configuration to build fs object
* @param filePath The ORC file path
* @return {@link ClosableIterator} of {@link HoodieKey}s for reading the ORC file
*/
@Override
public ClosableIterator getHoodieKeyIterator(Configuration configuration, Path filePath) {
try {
Configuration conf = new Configuration(configuration);
conf.addResource(FSUtils.getFs(filePath.toString(), conf).getConf());
Reader reader = OrcFile.createReader(filePath, OrcFile.readerOptions(conf));
Schema readSchema = HoodieAvroUtils.getRecordKeyPartitionPathSchema();
TypeDescription orcSchema = AvroOrcUtils.createOrcSchema(readSchema);
RecordReader recordReader = reader.rows(new Options(conf).schema(orcSchema));
List fieldNames = orcSchema.getFieldNames();
// column indices for the RECORD_KEY_METADATA_FIELD, PARTITION_PATH_METADATA_FIELD fields
int keyCol = -1;
int partitionCol = -1;
for (int i = 0; i < fieldNames.size(); i++) {
if (fieldNames.get(i).equals(HoodieRecord.RECORD_KEY_METADATA_FIELD)) {
keyCol = i;
}
if (fieldNames.get(i).equals(HoodieRecord.PARTITION_PATH_METADATA_FIELD)) {
partitionCol = i;
}
}
if (keyCol == -1 || partitionCol == -1) {
throw new HoodieException(String.format("Couldn't find row keys or partition path in %s.", filePath));
}
return new OrcReaderIterator<>(recordReader, readSchema, orcSchema);
} catch (IOException e) {
throw new HoodieIOException("Failed to open reader from ORC file:" + filePath, e);
}
}
/**
* Fetch {@link HoodieKey}s from the given ORC file.
*
* @param filePath The ORC file path.
* @param configuration configuration to build fs object
* @return {@link List} of {@link HoodieKey}s fetched from the ORC file
*/
@Override
public List fetchHoodieKeys(Configuration configuration, Path filePath) {
try {
if (!filePath.getFileSystem(configuration).exists(filePath)) {
return Collections.emptyList();
}
} catch (IOException e) {
throw new HoodieIOException("Failed to read from ORC file:" + filePath, e);
}
List hoodieKeys = new ArrayList<>();
try (ClosableIterator iterator = getHoodieKeyIterator(configuration, filePath, Option.empty())) {
iterator.forEachRemaining(hoodieKeys::add);
}
return hoodieKeys;
}
@Override
public List fetchHoodieKeys(Configuration configuration, Path filePath, Option keyGeneratorOpt) {
throw new UnsupportedOperationException("Custom key generator is not supported yet");
}
@Override
public ClosableIterator getHoodieKeyIterator(Configuration configuration, Path filePath, Option keyGeneratorOpt) {
throw new UnsupportedOperationException("Custom key generator is not supported yet");
}
/**
* NOTE: This literally reads the entire file contents, thus should be used with caution.
*/
@Override
public List readAvroRecords(Configuration configuration, Path filePath) {
Schema avroSchema;
try (Reader reader = OrcFile.createReader(filePath, OrcFile.readerOptions(configuration))) {
avroSchema = AvroOrcUtils.createAvroSchema(reader.getSchema());
} catch (IOException io) {
throw new HoodieIOException("Unable to read Avro records from an ORC file:" + filePath, io);
}
return readAvroRecords(configuration, filePath, avroSchema);
}
/**
* NOTE: This literally reads the entire file contents, thus should be used with caution.
*/
@Override
public List readAvroRecords(Configuration configuration, Path filePath, Schema avroSchema) {
List records = new ArrayList<>();
try (Reader reader = OrcFile.createReader(filePath, OrcFile.readerOptions(configuration))) {
TypeDescription orcSchema = reader.getSchema();
try (RecordReader recordReader = reader.rows(new Options(configuration).schema(orcSchema))) {
OrcReaderIterator iterator = new OrcReaderIterator<>(recordReader, avroSchema, orcSchema);
while (iterator.hasNext()) {
GenericRecord record = iterator.next();
records.add(record);
}
}
} catch (IOException io) {
throw new HoodieIOException("Unable to create an ORC reader for ORC file:" + filePath, io);
}
return records;
}
/**
* Read the rowKey list matching the given filter, from the given ORC file. If the filter is empty, then this will
* return all the rowkeys.
*
* @param conf configuration to build fs object.
* @param filePath The ORC file path.
* @param filter record keys filter
* @return Set Set of row keys matching candidateRecordKeys
*/
@Override
public Set filterRowKeys(Configuration conf, Path filePath, Set filter)
throws HoodieIOException {
try (Reader reader = OrcFile.createReader(filePath, OrcFile.readerOptions(conf));) {
TypeDescription schema = reader.getSchema();
try (RecordReader recordReader = reader.rows(new Options(conf).schema(schema))) {
Set filteredRowKeys = new HashSet<>();
List fieldNames = schema.getFieldNames();
VectorizedRowBatch batch = schema.createRowBatch();
// column index for the RECORD_KEY_METADATA_FIELD field
int colIndex = -1;
for (int i = 0; i < fieldNames.size(); i++) {
if (fieldNames.get(i).equals(HoodieRecord.RECORD_KEY_METADATA_FIELD)) {
colIndex = i;
break;
}
}
if (colIndex == -1) {
throw new HoodieException(String.format("Couldn't find row keys in %s.", filePath));
}
while (recordReader.nextBatch(batch)) {
BytesColumnVector rowKeys = (BytesColumnVector) batch.cols[colIndex];
for (int i = 0; i < batch.size; i++) {
String rowKey = rowKeys.toString(i);
if (filter.isEmpty() || filter.contains(rowKey)) {
filteredRowKeys.add(rowKey);
}
}
}
return filteredRowKeys;
}
} catch (IOException io) {
throw new HoodieIOException("Unable to read row keys for ORC file:" + filePath, io);
}
}
@Override
public Map readFooter(Configuration conf, boolean required,
Path orcFilePath, String... footerNames) {
try (Reader reader = OrcFile.createReader(orcFilePath, OrcFile.readerOptions(conf))) {
Map footerVals = new HashMap<>();
List metadataItemList = reader.getFileTail().getFooter().getMetadataList();
Map metadata = metadataItemList.stream().collect(Collectors.toMap(
UserMetadataItem::getName,
metadataItem -> metadataItem.getValue().toStringUtf8()));
for (String footerName : footerNames) {
if (metadata.containsKey(footerName)) {
footerVals.put(footerName, metadata.get(footerName));
} else if (required) {
throw new MetadataNotFoundException(
"Could not find index in ORC footer. Looked for key " + footerName + " in " + orcFilePath);
}
}
return footerVals;
} catch (IOException io) {
throw new HoodieIOException("Unable to read footer for ORC file:" + orcFilePath, io);
}
}
@Override
public Schema readAvroSchema(Configuration conf, Path orcFilePath) {
try (Reader reader = OrcFile.createReader(orcFilePath, OrcFile.readerOptions(conf))) {
if (reader.hasMetadataValue("orc.avro.schema")) {
ByteBuffer metadataValue = reader.getMetadataValue("orc.avro.schema");
byte[] bytes = toBytes(metadataValue);
return new Schema.Parser().parse(new String(bytes));
} else {
TypeDescription orcSchema = reader.getSchema();
return AvroOrcUtils.createAvroSchema(orcSchema);
}
} catch (IOException io) {
throw new HoodieIOException("Unable to get Avro schema for ORC file:" + orcFilePath, io);
}
}
@Override
public HoodieFileFormat getFormat() {
return HoodieFileFormat.ORC;
}
@Override
public long getRowCount(Configuration conf, Path orcFilePath) {
try (Reader reader = OrcFile.createReader(orcFilePath, OrcFile.readerOptions(conf))) {
return reader.getNumberOfRows();
} catch (IOException io) {
throw new HoodieIOException("Unable to get row count for ORC file:" + orcFilePath, io);
}
}
}
