org.apache.parquet.hadoop.example

Class GroupReadSupport

java.lang.Object

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

org.apache.parquet.hadoop.example.GroupReadSupport

public class GroupReadSupport
extends ReadSupport<Group>

Nested Class Summary

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

ReadSupport.ReadContext

Field Summary

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

PARQUET_READ_SCHEMA

Constructor Summary

Constructors

Constructor and Description
GroupReadSupport()

Method Summary

Modifier and Type	Method and Description
ReadSupport.ReadContext	init(org.apache.hadoop.conf.Configuration configuration, Map<String,String> keyValueMetaData, MessageType fileSchema) called in InputFormat.getSplits(org.apache.hadoop.mapreduce.JobContext) in the front end
RecordMaterializer<Group>	prepareForRead(org.apache.hadoop.conf.Configuration configuration, Map<String,String> keyValueMetaData, MessageType fileSchema, ReadSupport.ReadContext readContext) called in RecordReader.initialize(org.apache.hadoop.mapreduce.InputSplit, org.apache.hadoop.mapreduce.TaskAttemptContext) in the back end the returned RecordMaterializer will materialize the records and add them to the destination

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

Constructor Detail

GroupReadSupport

public GroupReadSupport()

Method Detail

init

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

Description copied from class: ReadSupport

called in InputFormat.getSplits(org.apache.hadoop.mapreduce.JobContext) in the front end

Overrides:

init in class ReadSupport<Group>

Parameters:

configuration - the job configuration

keyValueMetaData - the app specific metadata from the file

fileSchema - the schema of the file

Returns:

the readContext that defines how to read the file

prepareForRead

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

Description copied from class: ReadSupport

called in RecordReader.initialize(org.apache.hadoop.mapreduce.InputSplit, org.apache.hadoop.mapreduce.TaskAttemptContext) in the back end the returned RecordMaterializer will materialize the records and add them to the destination

Specified by:

prepareForRead in class ReadSupport<Group>

Parameters:

configuration - the job configuration

keyValueMetaData - the app specific metadata from the file

fileSchema - the schema of the file

readContext - returned by the init method

Returns:

the recordMaterializer that will materialize the records