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java.lang.Object org.apache.hadoop.mapreduce.RecordReader<Text,Text> org.apache.hadoop.mapreduce.lib.input.KeyValueLineRecordReader
@InterfaceAudience.Public @InterfaceStability.Stable public class KeyValueLineRecordReader
This class treats a line in the input as a key/value pair separated by a separator character. The separator can be specified in config file under the attribute name mapreduce.input.keyvaluelinerecordreader.key.value.separator. The default separator is the tab character ('\t').
Field Summary | |
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static String |
KEY_VALUE_SEPERATOR
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Constructor Summary | |
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KeyValueLineRecordReader(Configuration conf)
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Method Summary | |
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void |
close()
Close the record reader. |
static int |
findSeparator(byte[] utf,
int start,
int length,
byte sep)
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Text |
getCurrentKey()
Get the current key |
Text |
getCurrentValue()
Get the current value. |
Class |
getKeyClass()
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float |
getProgress()
The current progress of the record reader through its data. |
void |
initialize(InputSplit genericSplit,
TaskAttemptContext context)
Called once at initialization. |
boolean |
nextKeyValue()
Read key/value pair in a line. |
static void |
setKeyValue(Text key,
Text value,
byte[] line,
int lineLen,
int pos)
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Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final String KEY_VALUE_SEPERATOR
Constructor Detail |
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public KeyValueLineRecordReader(Configuration conf) throws IOException
IOException
Method Detail |
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public Class getKeyClass()
public void initialize(InputSplit genericSplit, TaskAttemptContext context) throws IOException
RecordReader
initialize
in class RecordReader<Text,Text>
genericSplit
- the split that defines the range of records to readcontext
- the information about the task
IOException
public static int findSeparator(byte[] utf, int start, int length, byte sep)
public static void setKeyValue(Text key, Text value, byte[] line, int lineLen, int pos)
public boolean nextKeyValue() throws IOException
nextKeyValue
in class RecordReader<Text,Text>
IOException
public Text getCurrentKey()
RecordReader
getCurrentKey
in class RecordReader<Text,Text>
public Text getCurrentValue()
RecordReader
getCurrentValue
in class RecordReader<Text,Text>
public float getProgress() throws IOException
RecordReader
getProgress
in class RecordReader<Text,Text>
IOException
public void close() throws IOException
RecordReader
close
in interface Closeable
close
in class RecordReader<Text,Text>
IOException
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