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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.parquet.hadoop;
import java.io.Closeable;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.parquet.column.ParquetProperties;
import org.apache.parquet.column.ParquetProperties.WriterVersion;
import org.apache.parquet.hadoop.api.WriteSupport;
import org.apache.parquet.hadoop.metadata.CompressionCodecName;
import org.apache.parquet.hadoop.metadata.ParquetMetadata;
import org.apache.parquet.hadoop.util.HadoopOutputFile;
import org.apache.parquet.io.OutputFile;
import org.apache.parquet.schema.MessageType;
/**
* Write records to a Parquet file.
*/
public class ParquetWriter implements Closeable {
public static final int DEFAULT_BLOCK_SIZE = 128 * 1024 * 1024;
public static final int DEFAULT_PAGE_SIZE =
ParquetProperties.DEFAULT_PAGE_SIZE;
public static final CompressionCodecName DEFAULT_COMPRESSION_CODEC_NAME =
CompressionCodecName.UNCOMPRESSED;
public static final boolean DEFAULT_IS_DICTIONARY_ENABLED =
ParquetProperties.DEFAULT_IS_DICTIONARY_ENABLED;
public static final boolean DEFAULT_IS_VALIDATING_ENABLED = false;
public static final WriterVersion DEFAULT_WRITER_VERSION =
ParquetProperties.DEFAULT_WRITER_VERSION;
public static final String OBJECT_MODEL_NAME_PROP = "writer.model.name";
// max size (bytes) to write as padding and the min size of a row group
public static final int MAX_PADDING_SIZE_DEFAULT = 8 * 1024 * 1024; // 8MB
private final InternalParquetRecordWriter writer;
private final CodecFactory codecFactory;
/**
* Create a new ParquetWriter.
* (with dictionary encoding enabled and validation off)
*
* @param file the file to create
* @param writeSupport the implementation to write a record to a RecordConsumer
* @param compressionCodecName the compression codec to use
* @param blockSize the block size threshold
* @param pageSize the page size threshold
* @throws IOException if there is an error while writing
* @deprecated will be removed in 2.0.0
*/
@Deprecated
public ParquetWriter(Path file, WriteSupport writeSupport, CompressionCodecName compressionCodecName, int blockSize, int pageSize) throws IOException {
this(file, writeSupport, compressionCodecName, blockSize, pageSize,
DEFAULT_IS_DICTIONARY_ENABLED, DEFAULT_IS_VALIDATING_ENABLED);
}
/**
* Create a new ParquetWriter.
*
* @param file the file to create
* @param writeSupport the implementation to write a record to a RecordConsumer
* @param compressionCodecName the compression codec to use
* @param blockSize the block size threshold
* @param pageSize the page size threshold (both data and dictionary)
* @param enableDictionary to turn dictionary encoding on
* @param validating to turn on validation using the schema
* @throws IOException if there is an error while writing
* @deprecated will be removed in 2.0.0
*/
@Deprecated
public ParquetWriter(
Path file,
WriteSupport writeSupport,
CompressionCodecName compressionCodecName,
int blockSize,
int pageSize,
boolean enableDictionary,
boolean validating) throws IOException {
this(file, writeSupport, compressionCodecName, blockSize, pageSize, pageSize, enableDictionary, validating);
}
/**
* Create a new ParquetWriter.
*
* @param file the file to create
* @param writeSupport the implementation to write a record to a RecordConsumer
* @param compressionCodecName the compression codec to use
* @param blockSize the block size threshold
* @param pageSize the page size threshold
* @param dictionaryPageSize the page size threshold for the dictionary pages
* @param enableDictionary to turn dictionary encoding on
* @param validating to turn on validation using the schema
* @throws IOException if there is an error while writing
* @deprecated will be removed in 2.0.0
*/
@Deprecated
public ParquetWriter(
Path file,
WriteSupport writeSupport,
CompressionCodecName compressionCodecName,
int blockSize,
int pageSize,
int dictionaryPageSize,
boolean enableDictionary,
boolean validating) throws IOException {
this(file, writeSupport, compressionCodecName, blockSize, pageSize,
dictionaryPageSize, enableDictionary, validating,
DEFAULT_WRITER_VERSION);
}
/**
* Create a new ParquetWriter.
*
* Directly instantiates a Hadoop {@link org.apache.hadoop.conf.Configuration} which reads
* configuration from the classpath.
*
* @param file the file to create
* @param writeSupport the implementation to write a record to a RecordConsumer
* @param compressionCodecName the compression codec to use
* @param blockSize the block size threshold
* @param pageSize the page size threshold
* @param dictionaryPageSize the page size threshold for the dictionary pages
* @param enableDictionary to turn dictionary encoding on
* @param validating to turn on validation using the schema
* @param writerVersion version of parquetWriter from {@link ParquetProperties.WriterVersion}
* @throws IOException if there is an error while writing
* @deprecated will be removed in 2.0.0
*/
@Deprecated
public ParquetWriter(
Path file,
WriteSupport writeSupport,
CompressionCodecName compressionCodecName,
int blockSize,
int pageSize,
int dictionaryPageSize,
boolean enableDictionary,
boolean validating,
WriterVersion writerVersion) throws IOException {
this(file, writeSupport, compressionCodecName, blockSize, pageSize, dictionaryPageSize, enableDictionary, validating, writerVersion, new Configuration());
}
/**
* Create a new ParquetWriter.
*
* @param file the file to create
* @param writeSupport the implementation to write a record to a RecordConsumer
* @param compressionCodecName the compression codec to use
* @param blockSize the block size threshold
* @param pageSize the page size threshold
* @param dictionaryPageSize the page size threshold for the dictionary pages
* @param enableDictionary to turn dictionary encoding on
* @param validating to turn on validation using the schema
* @param writerVersion version of parquetWriter from {@link ParquetProperties.WriterVersion}
* @param conf Hadoop configuration to use while accessing the filesystem
* @throws IOException if there is an error while writing
* @deprecated will be removed in 2.0.0
*/
@Deprecated
public ParquetWriter(
Path file,
WriteSupport writeSupport,
CompressionCodecName compressionCodecName,
int blockSize,
int pageSize,
int dictionaryPageSize,
boolean enableDictionary,
boolean validating,
WriterVersion writerVersion,
Configuration conf) throws IOException {
this(file, ParquetFileWriter.Mode.CREATE, writeSupport,
compressionCodecName, blockSize, pageSize, dictionaryPageSize,
enableDictionary, validating, writerVersion, conf);
}
/**
* Create a new ParquetWriter.
*
* @param file the file to create
* @param mode file creation mode
* @param writeSupport the implementation to write a record to a RecordConsumer
* @param compressionCodecName the compression codec to use
* @param blockSize the block size threshold
* @param pageSize the page size threshold
* @param dictionaryPageSize the page size threshold for the dictionary pages
* @param enableDictionary to turn dictionary encoding on
* @param validating to turn on validation using the schema
* @param writerVersion version of parquetWriter from {@link ParquetProperties.WriterVersion}
* @param conf Hadoop configuration to use while accessing the filesystem
* @throws IOException if there is an error while writing
* @deprecated will be removed in 2.0.0
*/
@Deprecated
public ParquetWriter(
Path file,
ParquetFileWriter.Mode mode,
WriteSupport writeSupport,
CompressionCodecName compressionCodecName,
int blockSize,
int pageSize,
int dictionaryPageSize,
boolean enableDictionary,
boolean validating,
WriterVersion writerVersion,
Configuration conf) throws IOException {
this(HadoopOutputFile.fromPath(file, conf),
mode, writeSupport, compressionCodecName, blockSize,
validating, conf, MAX_PADDING_SIZE_DEFAULT,
ParquetProperties.builder()
.withPageSize(pageSize)
.withDictionaryPageSize(dictionaryPageSize)
.withDictionaryEncoding(enableDictionary)
.withWriterVersion(writerVersion)
.build());
}
/**
* Create a new ParquetWriter. The default block size is 50 MB.The default
* page size is 1 MB. Default compression is no compression. Dictionary encoding is disabled.
*
* @param file the file to create
* @param writeSupport the implementation to write a record to a RecordConsumer
* @throws IOException if there is an error while writing
* @deprecated will be removed in 2.0.0
*/
@Deprecated
public ParquetWriter(Path file, WriteSupport writeSupport) throws IOException {
this(file, writeSupport, DEFAULT_COMPRESSION_CODEC_NAME, DEFAULT_BLOCK_SIZE, DEFAULT_PAGE_SIZE);
}
@Deprecated
public ParquetWriter(Path file, Configuration conf, WriteSupport writeSupport) throws IOException {
this(file,
writeSupport,
DEFAULT_COMPRESSION_CODEC_NAME,
DEFAULT_BLOCK_SIZE,
DEFAULT_PAGE_SIZE,
DEFAULT_PAGE_SIZE,
DEFAULT_IS_DICTIONARY_ENABLED,
DEFAULT_IS_VALIDATING_ENABLED,
DEFAULT_WRITER_VERSION,
conf);
}
ParquetWriter(
OutputFile file,
ParquetFileWriter.Mode mode,
WriteSupport writeSupport,
CompressionCodecName compressionCodecName,
int rowGroupSize,
boolean validating,
Configuration conf,
int maxPaddingSize,
ParquetProperties encodingProps) throws IOException {
WriteSupport.WriteContext writeContext = writeSupport.init(conf);
MessageType schema = writeContext.getSchema();
ParquetFileWriter fileWriter = new ParquetFileWriter(
file, schema, mode, rowGroupSize, maxPaddingSize);
fileWriter.start();
this.codecFactory = new CodecFactory(conf, encodingProps.getPageSizeThreshold());
CodecFactory.BytesCompressor compressor = codecFactory.getCompressor(compressionCodecName);
this.writer = new InternalParquetRecordWriter(
fileWriter,
writeSupport,
schema,
writeContext.getExtraMetaData(),
rowGroupSize,
compressor,
validating,
encodingProps);
}
public void write(T object) throws IOException {
try {
writer.write(object);
} catch (InterruptedException e) {
throw new IOException(e);
}
}
@Override
public void close() throws IOException {
try {
writer.close();
} catch (InterruptedException e) {
throw new IOException(e);
} finally {
// release after the writer closes in case it is used for a last flush
codecFactory.release();
}
}
/**
* @return the ParquetMetadata written to the (closed) file.
*/
public ParquetMetadata getFooter() {
return writer.getFooter();
}
/**
* @return the total size of data written to the file and buffered in memory
*/
public long getDataSize() {
return writer.getDataSize();
}
/**
* An abstract builder class for ParquetWriter instances.
*
* Object models should extend this builder to provide writer configuration
* options.
*
* @param The type of objects written by the constructed ParquetWriter.
* @param The type of this builder that is returned by builder methods
*/
public abstract static class Builder> {
private OutputFile file = null;
private Path path = null;
private Configuration conf = new Configuration();
private ParquetFileWriter.Mode mode;
private CompressionCodecName codecName = DEFAULT_COMPRESSION_CODEC_NAME;
private int rowGroupSize = DEFAULT_BLOCK_SIZE;
private int maxPaddingSize = MAX_PADDING_SIZE_DEFAULT;
private boolean enableValidation = DEFAULT_IS_VALIDATING_ENABLED;
private ParquetProperties.Builder encodingPropsBuilder =
ParquetProperties.builder();
protected Builder(Path path) {
this.path = path;
}
protected Builder(OutputFile path) {
this.file = path;
}
/**
* @return this as the correct subclass of ParquetWriter.Builder.
*/
protected abstract SELF self();
/**
* @param conf a configuration
* @return an appropriate WriteSupport for the object model.
*/
protected abstract WriteSupport getWriteSupport(Configuration conf);
/**
* Set the {@link Configuration} used by the constructed writer.
*
* @param conf a {@code Configuration}
* @return this builder for method chaining.
*/
public SELF withConf(Configuration conf) {
this.conf = conf;
return self();
}
/**
* Set the {@link ParquetFileWriter.Mode write mode} used when creating the
* backing file for this writer.
*
* @param mode a {@code ParquetFileWriter.Mode}
* @return this builder for method chaining.
*/
public SELF withWriteMode(ParquetFileWriter.Mode mode) {
this.mode = mode;
return self();
}
/**
* Set the {@link CompressionCodecName compression codec} used by the
* constructed writer.
*
* @param codecName a {@code CompressionCodecName}
* @return this builder for method chaining.
*/
public SELF withCompressionCodec(CompressionCodecName codecName) {
this.codecName = codecName;
return self();
}
/**
* Set the Parquet format row group size used by the constructed writer.
*
* @param rowGroupSize an integer size in bytes
* @return this builder for method chaining.
*/
public SELF withRowGroupSize(int rowGroupSize) {
this.rowGroupSize = rowGroupSize;
return self();
}
/**
* Set the Parquet format page size used by the constructed writer.
*
* @param pageSize an integer size in bytes
* @return this builder for method chaining.
*/
public SELF withPageSize(int pageSize) {
encodingPropsBuilder.withPageSize(pageSize);
return self();
}
/**
* Set the Parquet format dictionary page size used by the constructed
* writer.
*
* @param dictionaryPageSize an integer size in bytes
* @return this builder for method chaining.
*/
public SELF withDictionaryPageSize(int dictionaryPageSize) {
encodingPropsBuilder.withDictionaryPageSize(dictionaryPageSize);
return self();
}
/**
* Set the maximum amount of padding, in bytes, that will be used to align
* row groups with blocks in the underlying filesystem. If the underlying
* filesystem is not a block filesystem like HDFS, this has no effect.
*
* @param maxPaddingSize an integer size in bytes
* @return this builder for method chaining.
*/
public SELF withMaxPaddingSize(int maxPaddingSize) {
this.maxPaddingSize = maxPaddingSize;
return self();
}
/**
* Enables dictionary encoding for the constructed writer.
*
* @return this builder for method chaining.
*/
public SELF enableDictionaryEncoding() {
encodingPropsBuilder.withDictionaryEncoding(true);
return self();
}
/**
* Enable or disable dictionary encoding for the constructed writer.
*
* @param enableDictionary whether dictionary encoding should be enabled
* @return this builder for method chaining.
*/
public SELF withDictionaryEncoding(boolean enableDictionary) {
encodingPropsBuilder.withDictionaryEncoding(enableDictionary);
return self();
}
/**
* Enables validation for the constructed writer.
*
* @return this builder for method chaining.
*/
public SELF enableValidation() {
this.enableValidation = true;
return self();
}
/**
* Enable or disable validation for the constructed writer.
*
* @param enableValidation whether validation should be enabled
* @return this builder for method chaining.
*/
public SELF withValidation(boolean enableValidation) {
this.enableValidation = enableValidation;
return self();
}
/**
* Set the {@link WriterVersion format version} used by the constructed
* writer.
*
* @param version a {@code WriterVersion}
* @return this builder for method chaining.
*/
public SELF withWriterVersion(WriterVersion version) {
encodingPropsBuilder.withWriterVersion(version);
return self();
}
/**
* Set a property that will be available to the read path. For writers that use a Hadoop
* configuration, this is the recommended way to add configuration values.
*
* @param property a String property name
* @param value a String property value
* @return this builder for method chaining.
*/
public SELF config(String property, String value) {
conf.set(property, value);
return self();
}
/**
* Build a {@link ParquetWriter} with the accumulated configuration.
*
* @return a configured {@code ParquetWriter} instance.
* @throws IOException if there is an error while creating the writer
*/
public ParquetWriter build() throws IOException {
if (file != null) {
return new ParquetWriter<>(file,
mode, getWriteSupport(conf), codecName, rowGroupSize, enableValidation, conf,
maxPaddingSize, encodingPropsBuilder.build());
} else {
return new ParquetWriter<>(HadoopOutputFile.fromPath(path, conf),
mode, getWriteSupport(conf), codecName,
rowGroupSize, enableValidation, conf, maxPaddingSize,
encodingPropsBuilder.build());
}
}
}
}
