ml.shifu.guagua.hadoop.io
类 GuaguaSequenceAsTextRecordReader

java.lang.Object
  ml.shifu.guagua.hadoop.io.GuaguaSequenceAsTextRecordReader

所有已实现的接口：

GuaguaRecordReader<GuaguaWritableAdapter<org.apache.hadoop.io.Text>,GuaguaWritableAdapter<org.apache.hadoop.io.Text>>

public class GuaguaSequenceAsTextRecordReader
extends Object
implements GuaguaRecordReader<GuaguaWritableAdapter<org.apache.hadoop.io.Text>,GuaguaWritableAdapter<org.apache.hadoop.io.Text>>

A reader read HDFS sequence file key by key. The sequence key and value types are both BytesWritable.

Copy some code from org.apache.hadoop.mapred.GuaguaSequenceAsTextRecordReader but to support GuaguaRecordReader interface.

If use default constructor, user should also call initialize(GuaguaFileSplit) like in below:

 this.setRecordReader(new GuaguaSequenceAsBinaryRecordReader());
 this.getRecordReader().initialize(fileSplit);
 

or directly use other constructors:

 this.setRecordReader(new GuaguaSequenceAsTextRecordReader(fileSplit));
 

构造方法摘要

GuaguaSequenceAsTextRecordReader()

GuaguaSequenceAsTextRecordReader(org.apache.hadoop.conf.Configuration conf, GuaguaFileSplit split)

GuaguaSequenceAsTextRecordReader(GuaguaFileSplit split)

方法摘要

void	close()
GuaguaWritableAdapter<org.apache.hadoop.io.Text>	getCurrentKey()
GuaguaWritableAdapter<org.apache.hadoop.io.Text>	getCurrentValue()
float	getProgress() Return the progress within the input split
void	initialize(GuaguaFileSplit split)
boolean	nextKeyValue()

从类 java.lang.Object 继承的方法

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

构造方法详细信息

GuaguaSequenceAsTextRecordReader

public GuaguaSequenceAsTextRecordReader()

GuaguaSequenceAsTextRecordReader

public GuaguaSequenceAsTextRecordReader(GuaguaFileSplit split)
                                 throws IOException

抛出：

IOException

GuaguaSequenceAsTextRecordReader

public GuaguaSequenceAsTextRecordReader(org.apache.hadoop.conf.Configuration conf,
                                        GuaguaFileSplit split)
                                 throws IOException

抛出：

IOException

方法详细信息

getProgress

public float getProgress()
                  throws IOException

Return the progress within the input split

返回：

0.0 to 1.0 of the input byte range

抛出：

IOException

initialize

public void initialize(GuaguaFileSplit split)
                throws IOException

指定者：

接口 GuaguaRecordReader<GuaguaWritableAdapter<org.apache.hadoop.io.Text>,GuaguaWritableAdapter<org.apache.hadoop.io.Text>> 中的 initialize

抛出：

IOException

nextKeyValue

public boolean nextKeyValue()
                     throws IOException

指定者：

接口 GuaguaRecordReader<GuaguaWritableAdapter<org.apache.hadoop.io.Text>,GuaguaWritableAdapter<org.apache.hadoop.io.Text>> 中的 nextKeyValue

抛出：

IOException

getCurrentKey

public GuaguaWritableAdapter<org.apache.hadoop.io.Text> getCurrentKey()

指定者：

接口 GuaguaRecordReader<GuaguaWritableAdapter<org.apache.hadoop.io.Text>,GuaguaWritableAdapter<org.apache.hadoop.io.Text>> 中的 getCurrentKey

getCurrentValue

public GuaguaWritableAdapter<org.apache.hadoop.io.Text> getCurrentValue()

指定者：

接口 GuaguaRecordReader<GuaguaWritableAdapter<org.apache.hadoop.io.Text>,GuaguaWritableAdapter<org.apache.hadoop.io.Text>> 中的 getCurrentValue

close

public void close()
           throws IOException

指定者：

接口 GuaguaRecordReader<GuaguaWritableAdapter<org.apache.hadoop.io.Text>,GuaguaWritableAdapter<org.apache.hadoop.io.Text>> 中的 close

抛出：

IOException