org.apache.accumulo.core.client.mapred
Class AbstractInputFormat.AbstractRecordReader<K,V>
java.lang.Object
org.apache.accumulo.core.client.mapred.AbstractInputFormat.AbstractRecordReader<K,V>
- All Implemented Interfaces:
- org.apache.hadoop.mapred.RecordReader<K,V>
- Direct Known Subclasses:
- InputFormatBase.RecordReaderBase
- Enclosing class:
- AbstractInputFormat<K,V>
protected abstract static class AbstractInputFormat.AbstractRecordReader<K,V>
- extends Object
- implements org.apache.hadoop.mapred.RecordReader<K,V>
An abstract base class to be used to create RecordReader
instances that convert from Accumulo
Key
/Value
pairs to the user's K/V types.
Subclasses must implement RecordReader.next(Object, Object)
to update key and value, and also to update the following variables:
Method Summary |
void |
close()
|
long |
getPos()
|
float |
getProgress()
|
void |
initialize(org.apache.hadoop.mapred.InputSplit inSplit,
org.apache.hadoop.mapred.JobConf job)
Initialize a scanner over the given input split using this task attempt configuration. |
protected abstract void |
setupIterators(org.apache.hadoop.mapred.JobConf job,
Scanner scanner,
String tableName,
RangeInputSplit split)
Configures the iterators on a scanner for the given table name. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface org.apache.hadoop.mapred.RecordReader |
createKey, createValue, next |
numKeysRead
protected long numKeysRead
scannerIterator
protected Iterator<Map.Entry<Key,Value>> scannerIterator
split
protected RangeInputSplit split
currentKey
protected Key currentKey
AbstractInputFormat.AbstractRecordReader
protected AbstractInputFormat.AbstractRecordReader()
setupIterators
protected abstract void setupIterators(org.apache.hadoop.mapred.JobConf job,
Scanner scanner,
String tableName,
RangeInputSplit split)
- Configures the iterators on a scanner for the given table name.
- Parameters:
job
- the Hadoop job configurationscanner
- the scanner for which to configure the iteratorstableName
- the table name for which the scanner is configured- Since:
- 1.6.0
initialize
public void initialize(org.apache.hadoop.mapred.InputSplit inSplit,
org.apache.hadoop.mapred.JobConf job)
throws IOException
- Initialize a scanner over the given input split using this task attempt configuration.
- Throws:
IOException
close
public void close()
- Specified by:
close
in interface org.apache.hadoop.mapred.RecordReader<K,V>
getPos
public long getPos()
throws IOException
- Specified by:
getPos
in interface org.apache.hadoop.mapred.RecordReader<K,V>
- Throws:
IOException
getProgress
public float getProgress()
throws IOException
- Specified by:
getProgress
in interface org.apache.hadoop.mapred.RecordReader<K,V>
- Throws:
IOException
Copyright © 2015 Apache Accumulo Project. All rights reserved.