parquet.hadoop

Class ParquetInputFormat<T>

java.lang.Object

org.apache.hadoop.mapreduce.InputFormat<K,V>

org.apache.hadoop.mapreduce.lib.input.FileInputFormat<Void,T>

parquet.hadoop.ParquetInputFormat<T>

Type Parameters:

T - the type of the materialized records

Direct Known Subclasses:

ExampleInputFormat

public class ParquetInputFormat<T>
extends org.apache.hadoop.mapreduce.lib.input.FileInputFormat<Void,T>

The input format to read a Parquet file. It requires an implementation of ReadSupport to materialize the records. The requestedSchema will control how the original records get projected by the loader. It must be a subset of the original schema. Only the columns needed to reconstruct the records with the requestedSchema will be scanned.

Author:

Julien Le Dem

See Also:

READ_SUPPORT_CLASS, UNBOUND_RECORD_FILTER, STRICT_TYPE_CHECKING, FILTER_PREDICATE, TASK_SIDE_METADATA

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.lib.input.FileInputFormat

org.apache.hadoop.mapreduce.lib.input.FileInputFormat.Counter

Field Summary

Fields

Modifier and Type	Field and Description
static String	FILTER_PREDICATE key to configure the filter predicate
static String	READ_SUPPORT_CLASS key to configure the ReadSupport implementation
static String	STRICT_TYPE_CHECKING key to configure type checking for conflicting schemas (default: true)
static String	TASK_SIDE_METADATA key to turn on or off task side metadata loading (default true) if true then metadata is read on the task side and some tasks may finish immediately.
static String	UNBOUND_RECORD_FILTER key to configure the filter

Constructor Summary

Constructors

Constructor and Description
ParquetInputFormat() Hadoop will instantiate using this constructor
ParquetInputFormat(Class<S> readSupportClass) Constructor for subclasses, such as AvroParquetInputFormat, or wrappers.

Method Summary

Methods

Modifier and Type	Method and Description
org.apache.hadoop.mapreduce.RecordReader<Void,T>	createRecordReader(org.apache.hadoop.mapreduce.InputSplit inputSplit, org.apache.hadoop.mapreduce.TaskAttemptContext taskAttemptContext)
static FilterCompat.Filter	getFilter(org.apache.hadoop.conf.Configuration conf) Returns a non-null Filter, which is a wrapper around either a FilterPredicate, an UnboundRecordFilter, or a no-op filter.
List<Footer>	getFooters(org.apache.hadoop.conf.Configuration configuration, Collection<org.apache.hadoop.fs.FileStatus> statuses) the footers for the files
List<Footer>	getFooters(org.apache.hadoop.conf.Configuration configuration, List<org.apache.hadoop.fs.FileStatus> statuses)
List<Footer>	getFooters(org.apache.hadoop.mapreduce.JobContext jobContext)
GlobalMetaData	getGlobalMetaData(org.apache.hadoop.mapreduce.JobContext jobContext)
static Class<?>	getReadSupportClass(org.apache.hadoop.conf.Configuration configuration)
static <T> ReadSupport<T>	getReadSupportInstance(org.apache.hadoop.conf.Configuration configuration)
List<ParquetInputSplit>	getSplits(org.apache.hadoop.conf.Configuration configuration, List<Footer> footers) Deprecated. split planning using file footers will be removed
List<org.apache.hadoop.mapreduce.InputSplit>	getSplits(org.apache.hadoop.mapreduce.JobContext jobContext)
static Class<?>	getUnboundRecordFilter(org.apache.hadoop.conf.Configuration configuration) Deprecated. use getFilter(Configuration)
static boolean	isTaskSideMetaData(org.apache.hadoop.conf.Configuration configuration)
protected List<org.apache.hadoop.fs.FileStatus>	listStatus(org.apache.hadoop.mapreduce.JobContext jobContext)
static void	setFilterPredicate(org.apache.hadoop.conf.Configuration configuration, FilterPredicate filterPredicate)
static void	setReadSupportClass(org.apache.hadoop.mapreduce.Job job, Class<?> readSupportClass)
static void	setReadSupportClass(org.apache.hadoop.mapred.JobConf conf, Class<?> readSupportClass)
static void	setTaskSideMetaData(org.apache.hadoop.mapreduce.Job job, boolean taskSideMetadata)
static void	setUnboundRecordFilter(org.apache.hadoop.mapreduce.Job job, Class<? extends UnboundRecordFilter> filterClass)

Methods inherited from class org.apache.hadoop.mapreduce.lib.input.FileInputFormat

addInputPath, addInputPaths, computeSplitSize, getBlockIndex, getFormatMinSplitSize, getInputPathFilter, getInputPaths, getMaxSplitSize, getMinSplitSize, isSplitable, setInputPathFilter, setInputPaths, setInputPaths, setMaxInputSplitSize, setMinInputSplitSize

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

READ_SUPPORT_CLASS

public static final String READ_SUPPORT_CLASS

key to configure the ReadSupport implementation

See Also:

Constant Field Values

UNBOUND_RECORD_FILTER

public static final String UNBOUND_RECORD_FILTER

key to configure the filter

See Also:

Constant Field Values

STRICT_TYPE_CHECKING

public static final String STRICT_TYPE_CHECKING

key to configure type checking for conflicting schemas (default: true)

See Also:

Constant Field Values

FILTER_PREDICATE

public static final String FILTER_PREDICATE

key to configure the filter predicate

See Also:

Constant Field Values

TASK_SIDE_METADATA

public static final String TASK_SIDE_METADATA

key to turn on or off task side metadata loading (default true) if true then metadata is read on the task side and some tasks may finish immediately. if false metadata is read on the client which is slower if there is a lot of metadata but tasks will only be spawn if there is work to do.

See Also:

Constant Field Values

Constructor Detail

ParquetInputFormat

public ParquetInputFormat()

Hadoop will instantiate using this constructor

ParquetInputFormat

public ParquetInputFormat(Class<S> readSupportClass)

Constructor for subclasses, such as AvroParquetInputFormat, or wrappers.

Subclasses and wrappers may use this constructor to set the ReadSupport class that will be used when reading instead of requiring the user to set the read support property in their configuration.

Parameters:

readSupportClass - a ReadSupport subclass

Method Detail

setTaskSideMetaData

public static void setTaskSideMetaData(org.apache.hadoop.mapreduce.Job job,
                       boolean taskSideMetadata)

isTaskSideMetaData

public static boolean isTaskSideMetaData(org.apache.hadoop.conf.Configuration configuration)

setReadSupportClass

public static void setReadSupportClass(org.apache.hadoop.mapreduce.Job job,
                       Class<?> readSupportClass)

setUnboundRecordFilter

public static void setUnboundRecordFilter(org.apache.hadoop.mapreduce.Job job,
                          Class<? extends UnboundRecordFilter> filterClass)

getUnboundRecordFilter

@Deprecated
public static Class<?> getUnboundRecordFilter(org.apache.hadoop.conf.Configuration configuration)

Deprecated. use getFilter(Configuration)

setReadSupportClass

public static void setReadSupportClass(org.apache.hadoop.mapred.JobConf conf,
                       Class<?> readSupportClass)

getReadSupportClass

public static Class<?> getReadSupportClass(org.apache.hadoop.conf.Configuration configuration)

setFilterPredicate

public static void setFilterPredicate(org.apache.hadoop.conf.Configuration configuration,
                      FilterPredicate filterPredicate)

getFilter

public static FilterCompat.Filter getFilter(org.apache.hadoop.conf.Configuration conf)

Returns a non-null Filter, which is a wrapper around either a FilterPredicate, an UnboundRecordFilter, or a no-op filter.

createRecordReader

public org.apache.hadoop.mapreduce.RecordReader<Void,T> createRecordReader(org.apache.hadoop.mapreduce.InputSplit inputSplit,
                                                                  org.apache.hadoop.mapreduce.TaskAttemptContext taskAttemptContext)
                                                                    throws IOException,
                                                                           InterruptedException

Specified by:

createRecordReader in class org.apache.hadoop.mapreduce.InputFormat<Void,T>

Throws:

IOException

InterruptedException

getReadSupportInstance

public static <T> ReadSupport<T> getReadSupportInstance(org.apache.hadoop.conf.Configuration configuration)

Parameters:

configuration - to find the configuration for the read support

Returns:

the configured read support

getSplits

public List<org.apache.hadoop.mapreduce.InputSplit> getSplits(org.apache.hadoop.mapreduce.JobContext jobContext)
                                                       throws IOException

Overrides:

getSplits in class org.apache.hadoop.mapreduce.lib.input.FileInputFormat<Void,T>

Throws:

IOException

getSplits

@Deprecated
public List<ParquetInputSplit> getSplits(org.apache.hadoop.conf.Configuration configuration,
                                           List<Footer> footers)
                                  throws IOException

Deprecated. split planning using file footers will be removed

Parameters:

configuration - the configuration to connect to the file system

footers - the footers of the files to read

Returns:

the splits for the footers

Throws:

IOException

listStatus

protected List<org.apache.hadoop.fs.FileStatus> listStatus(org.apache.hadoop.mapreduce.JobContext jobContext)
                                                    throws IOException

Overrides:

listStatus in class org.apache.hadoop.mapreduce.lib.input.FileInputFormat<Void,T>

Throws:

IOException

getFooters

public List<Footer> getFooters(org.apache.hadoop.mapreduce.JobContext jobContext)
                        throws IOException

Parameters:

jobContext - the current job context

Returns:

the footers for the files

Throws:

IOException

getFooters

public List<Footer> getFooters(org.apache.hadoop.conf.Configuration configuration,
                      List<org.apache.hadoop.fs.FileStatus> statuses)
                        throws IOException

Throws:

IOException

getFooters

public List<Footer> getFooters(org.apache.hadoop.conf.Configuration configuration,
                      Collection<org.apache.hadoop.fs.FileStatus> statuses)
                        throws IOException

the footers for the files

Parameters:

configuration - to connect to the file system

statuses - the files to open

Returns:

the footers of the files

Throws:

IOException

getGlobalMetaData

public GlobalMetaData getGlobalMetaData(org.apache.hadoop.mapreduce.JobContext jobContext)
                                 throws IOException

Parameters:

jobContext - the current job context

Returns:

the merged metadata from the footers

Throws:

IOException