Package org.apache.parquet.proto

Class ProtoReadSupport<T extends com.google.protobuf.Message>

java.lang.Object

org.apache.parquet.hadoop.api.ReadSupport<T>

org.apache.parquet.proto.ProtoReadSupport<T>

public class ProtoReadSupport<T extends com.google.protobuf.Message>
extends ReadSupport<T>

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.parquet.hadoop.api.ReadSupport

ReadSupport.ReadContext

Field Summary

Fields

Modifier and Type	Field	Description
static String	PB_CLASS
static String	PB_DESCRIPTOR
static String	PB_REQUESTED_PROJECTION

Fields inherited from class org.apache.parquet.hadoop.api.ReadSupport

PARQUET_READ_SCHEMA

Constructor Summary

Constructors

Constructor	Description
ProtoReadSupport()

Method Summary

Modifier and Type	Method	Description
ReadSupport.ReadContext	init(InitContext context)
RecordMaterializer<T>	prepareForRead(org.apache.hadoop.conf.Configuration configuration, Map<String,String> keyValueMetaData, MessageType fileSchema, ReadSupport.ReadContext readContext)
static void	setProtobufClass(org.apache.hadoop.conf.Configuration configuration, String protobufClass)	Set name of protobuf class to be used for reading data.
static void	setRequestedProjection(org.apache.hadoop.conf.Configuration configuration, String requestedProjection)

Methods inherited from class org.apache.parquet.hadoop.api.ReadSupport

getSchemaForRead, getSchemaForRead, init

Methods inherited from class java.lang.Object

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

Field Detail

PB_REQUESTED_PROJECTION

public static final String PB_REQUESTED_PROJECTION

See Also:

Constant Field Values

PB_CLASS

public static final String PB_CLASS

See Also:

Constant Field Values

PB_DESCRIPTOR

public static final String PB_DESCRIPTOR

See Also:

Constant Field Values

Constructor Detail

ProtoReadSupport

public ProtoReadSupport()

Method Detail

setRequestedProjection

public static void setRequestedProjection(org.apache.hadoop.conf.Configuration configuration,
                                          String requestedProjection)

setProtobufClass

public static void setProtobufClass(org.apache.hadoop.conf.Configuration configuration,
                                    String protobufClass)

Set name of protobuf class to be used for reading data. If no class is set, value from file header is used. Note that the value in header is present only if the file was written using parquet-protobuf project, it will fail otherwise.

Parameters:

configuration - a configuration

protobufClass - a fully-qualified protobuf class name

init

public ReadSupport.ReadContext init(InitContext context)

Overrides:

init in class ReadSupport<T extends com.google.protobuf.Message>

prepareForRead

public RecordMaterializer<T> prepareForRead(org.apache.hadoop.conf.Configuration configuration,
                                            Map<String,String> keyValueMetaData,
                                            MessageType fileSchema,
                                            ReadSupport.ReadContext readContext)

Specified by:

prepareForRead in class ReadSupport<T extends com.google.protobuf.Message>