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java.lang.Object org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text> org.apache.hadoop.mapreduce.lib.input.LineRecordReader
@InterfaceAudience.LimitedPrivate(value={"MapReduce","Pig"}) @InterfaceStability.Evolving public class LineRecordReader
Treats keys as offset in file and value as line.
Field Summary | |
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static String |
MAX_LINE_LENGTH
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Constructor Summary | |
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LineRecordReader()
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LineRecordReader(byte[] recordDelimiter)
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Method Summary | |
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void |
close()
Close the record reader. |
org.apache.hadoop.io.LongWritable |
getCurrentKey()
Get the current key |
org.apache.hadoop.io.Text |
getCurrentValue()
Get the current value. |
float |
getProgress()
Get the progress within the split |
void |
initialize(InputSplit genericSplit,
TaskAttemptContext context)
Called once at initialization. |
boolean |
nextKeyValue()
Read the next key, value pair. |
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 MAX_LINE_LENGTH
Constructor Detail |
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public LineRecordReader()
public LineRecordReader(byte[] recordDelimiter)
Method Detail |
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public void initialize(InputSplit genericSplit, TaskAttemptContext context) throws IOException
RecordReader
initialize
in class RecordReader<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text>
genericSplit
- the split that defines the range of records to readcontext
- the information about the task
IOException
public boolean nextKeyValue() throws IOException
RecordReader
nextKeyValue
in class RecordReader<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text>
IOException
public org.apache.hadoop.io.LongWritable getCurrentKey()
RecordReader
getCurrentKey
in class RecordReader<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text>
public org.apache.hadoop.io.Text getCurrentValue()
RecordReader
getCurrentValue
in class RecordReader<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text>
public float getProgress() throws IOException
getProgress
in class RecordReader<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text>
IOException
public void close() throws IOException
RecordReader
close
in interface Closeable
close
in class RecordReader<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text>
IOException
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