com.twitter.elephantbird.mapreduce.output
Class RCFileOutputFormat

java.lang.Object
  org.apache.hadoop.mapreduce.OutputFormat<K,V>
      org.apache.hadoop.mapreduce.lib.output.FileOutputFormat<org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.Writable>
          com.twitter.elephantbird.mapreduce.output.RCFileOutputFormat

Direct Known Subclasses:

RCFileProtobufOutputFormat, RCFileThriftOutputFormat

public class RCFileOutputFormat
extends org.apache.hadoop.mapreduce.lib.output.FileOutputFormat<org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.Writable>

Hive's RCFileOutputFormat is written for deprecated OutputFormat. Pig requires newer OutputFormat. In addition RCFileOutputFormat's functionality this class adds RCFile metadata support. TODO: contribute this to PIG.

Nested Class Summary

protected static class

RCFileOutputFormat.Writer RecordWriter wrapper around an RCFile.Writer

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.lib.output.FileOutputFormat

org.apache.hadoop.mapreduce.lib.output.FileOutputFormat.Counter

Field Summary

static String	COMPRESSION_CODEC_CONF
static String	DEFAULT_EXTENSION
static String	EXTENSION_OVERRIDE_CONF

Fields inherited from class org.apache.hadoop.mapreduce.lib.output.FileOutputFormat

BASE_OUTPUT_NAME, PART

Constructor Summary

RCFileOutputFormat()

Method Summary

protected org.apache.hadoop.hive.ql.io.RCFile.Writer	createRCFileWriter(org.apache.hadoop.mapreduce.TaskAttemptContext job, org.apache.hadoop.io.Text columnMetadata)
static int	getColumnNumber(org.apache.hadoop.conf.Configuration conf) Returns the number of columns set in the conf for writers.
org.apache.hadoop.mapreduce.RecordWriter<org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.Writable>	getRecordWriter(org.apache.hadoop.mapreduce.TaskAttemptContext job)
static void	setColumnNumber(org.apache.hadoop.conf.Configuration conf, int columnNum) set number of columns into the given configuration.

Methods inherited from class org.apache.hadoop.mapreduce.lib.output.FileOutputFormat

checkOutputSpecs, getCompressOutput, getDefaultWorkFile, getOutputCommitter, getOutputCompressorClass, getOutputName, getOutputPath, getPathForWorkFile, getUniqueFile, getWorkOutputPath, setCompressOutput, setOutputCompressorClass, setOutputName, setOutputPath

Methods inherited from class java.lang.Object

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

Field Detail

COMPRESSION_CODEC_CONF

public static String COMPRESSION_CODEC_CONF

DEFAULT_EXTENSION

public static String DEFAULT_EXTENSION

EXTENSION_OVERRIDE_CONF

public static String EXTENSION_OVERRIDE_CONF

Constructor Detail

RCFileOutputFormat

public RCFileOutputFormat()

Method Detail

setColumnNumber

public static void setColumnNumber(org.apache.hadoop.conf.Configuration conf,
                                   int columnNum)

set number of columns into the given configuration.

Parameters:

conf - configuration instance which need to set the column number

columnNum - column number for RCFile's Writer

getColumnNumber

public static int getColumnNumber(org.apache.hadoop.conf.Configuration conf)

Returns the number of columns set in the conf for writers.

Parameters:

conf -

Returns:

number of columns for RCFile's writer

createRCFileWriter

protected org.apache.hadoop.hive.ql.io.RCFile.Writer createRCFileWriter(org.apache.hadoop.mapreduce.TaskAttemptContext job,
                                                                        org.apache.hadoop.io.Text columnMetadata)
                                                                 throws IOException

Throws:

IOException

getRecordWriter

public org.apache.hadoop.mapreduce.RecordWriter<org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.Writable> getRecordWriter(org.apache.hadoop.mapreduce.TaskAttemptContext job)
                                                                                                                          throws IOException,
                                                                                                                                 InterruptedException

Specified by:

getRecordWriter in class org.apache.hadoop.mapreduce.lib.output.FileOutputFormat<org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.Writable>

Throws:

IOException

InterruptedException