org.apache.hadoop.mapreduce.lib.input

类 SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader

java.lang.Object

org.apache.hadoop.mapreduce.RecordReader<BytesWritable,BytesWritable>

org.apache.hadoop.mapreduce.lib.input.SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader

所有已实现的接口:

Closeable, AutoCloseable

封闭类:

SequenceFileAsBinaryInputFormat

public static class SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader
extends RecordReader<BytesWritable,BytesWritable>

Read records from a SequenceFile as binary (raw) bytes.

构造器概要

构造器

构造器和说明
SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader()

方法概要

方法

限定符和类型	方法和说明
void	close() Close the record reader.
BytesWritable	getCurrentKey() Get the current key
BytesWritable	getCurrentValue() Get the current value.
String	getKeyClassName() Retrieve the name of the key class for this SequenceFile.
float	getProgress() Return the progress within the input split
String	getValueClassName() Retrieve the name of the value class for this SequenceFile.
void	initialize(InputSplit split, TaskAttemptContext context) Called once at initialization.
boolean	nextKeyValue() Read raw bytes from a SequenceFile.

从类继承的方法 java.lang.Object

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

构造器详细资料

SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader

public SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader()

方法详细资料

initialize

public void initialize(InputSplit split,
              TaskAttemptContext context)
                throws IOException,
                       InterruptedException

从类复制的说明: RecordReader

Called once at initialization.

指定者:

initialize 在类中 RecordReader<BytesWritable,BytesWritable>

参数:

split - the split that defines the range of records to read

context - the information about the task

抛出:

IOException

InterruptedException

getCurrentKey

public BytesWritable getCurrentKey()
                            throws IOException,
                                   InterruptedException

从类复制的说明: RecordReader

Get the current key

指定者:

getCurrentKey 在类中 RecordReader<BytesWritable,BytesWritable>

返回:

the current key or null if there is no current key

抛出:

IOException

InterruptedException

getCurrentValue

public BytesWritable getCurrentValue()
                              throws IOException,
                                     InterruptedException

从类复制的说明: RecordReader

Get the current value.

指定者:

getCurrentValue 在类中 RecordReader<BytesWritable,BytesWritable>

返回:

the object that was read

抛出:

IOException

InterruptedException

getKeyClassName

public String getKeyClassName()

Retrieve the name of the key class for this SequenceFile.

另请参阅:

SequenceFile.Reader.getKeyClassName()

getValueClassName

public String getValueClassName()

Retrieve the name of the value class for this SequenceFile.

另请参阅:

SequenceFile.Reader.getValueClassName()

nextKeyValue

public boolean nextKeyValue()
                     throws IOException,
                            InterruptedException

Read raw bytes from a SequenceFile.

指定者:

nextKeyValue 在类中 RecordReader<BytesWritable,BytesWritable>

返回:

true if a key/value pair was read

抛出:

IOException

InterruptedException

close

public void close()
           throws IOException

从类复制的说明: RecordReader

Close the record reader.

指定者:

close 在接口中 Closeable

指定者:

close 在接口中 AutoCloseable

指定者:

close 在类中 RecordReader<BytesWritable,BytesWritable>

抛出:

IOException

getProgress

public float getProgress()
                  throws IOException,
                         InterruptedException

Return the progress within the input split

指定者:

getProgress 在类中 RecordReader<BytesWritable,BytesWritable>

返回:

0.0 to 1.0 of the input byte range

抛出:

IOException

InterruptedException