org.apache.hadoop.zebra.mapreduce
Class TableRecordReader
java.lang.Object
org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.BytesWritable,Tuple>
org.apache.hadoop.zebra.mapreduce.TableRecordReader
- All Implemented Interfaces:
- Closeable
public class TableRecordReader
- extends org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.BytesWritable,Tuple>
Adaptor class to implement RecordReader on top of Scanner.
Constructor Summary |
TableRecordReader(org.apache.hadoop.zebra.mapreduce.TableExpr expr,
String projection,
org.apache.hadoop.mapreduce.InputSplit split,
org.apache.hadoop.mapreduce.JobContext jobContext)
|
Method Summary |
boolean |
atEnd()
Check if the end of the input has been reached |
void |
close()
|
org.apache.hadoop.io.BytesWritable |
getCurrentKey()
|
Tuple |
getCurrentValue()
|
long |
getPos()
|
float |
getProgress()
|
void |
initialize(org.apache.hadoop.mapreduce.InputSplit arg0,
org.apache.hadoop.mapreduce.TaskAttemptContext arg1)
|
boolean |
nextKeyValue()
|
boolean |
seekTo(org.apache.hadoop.io.BytesWritable key)
Seek to the position at the first row which has the key
or just after the key; only applicable for sorted Zebra table |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
TableRecordReader
public TableRecordReader(org.apache.hadoop.zebra.mapreduce.TableExpr expr,
String projection,
org.apache.hadoop.mapreduce.InputSplit split,
org.apache.hadoop.mapreduce.JobContext jobContext)
throws IOException,
ParseException
- Parameters:
expr
- Table expressionprojection
- projection schema. Should never be null.split
- the split to work onjobContext
- JobContext object
- Throws:
IOException
ParseException
close
public void close()
throws IOException
- Specified by:
close
in interface Closeable
- Specified by:
close
in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.BytesWritable,Tuple>
- Throws:
IOException
getPos
public long getPos()
throws IOException
- Throws:
IOException
getProgress
public float getProgress()
throws IOException
- Specified by:
getProgress
in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.BytesWritable,Tuple>
- Throws:
IOException
seekTo
public boolean seekTo(org.apache.hadoop.io.BytesWritable key)
throws IOException
- Seek to the position at the first row which has the key
or just after the key; only applicable for sorted Zebra table
- Parameters:
key
- the key to seek on
- Throws:
IOException
atEnd
public boolean atEnd()
throws IOException
- Check if the end of the input has been reached
- Returns:
- true if the end of the input is reached
- Throws:
IOException
getCurrentKey
public org.apache.hadoop.io.BytesWritable getCurrentKey()
throws IOException,
InterruptedException
- Specified by:
getCurrentKey
in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.BytesWritable,Tuple>
- Throws:
IOException
InterruptedException
getCurrentValue
public Tuple getCurrentValue()
throws IOException,
InterruptedException
- Specified by:
getCurrentValue
in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.BytesWritable,Tuple>
- Throws:
IOException
InterruptedException
initialize
public void initialize(org.apache.hadoop.mapreduce.InputSplit arg0,
org.apache.hadoop.mapreduce.TaskAttemptContext arg1)
throws IOException,
InterruptedException
- Specified by:
initialize
in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.BytesWritable,Tuple>
- Throws:
IOException
InterruptedException
nextKeyValue
public boolean nextKeyValue()
throws IOException,
InterruptedException
- Specified by:
nextKeyValue
in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.BytesWritable,Tuple>
- Throws:
IOException
InterruptedException
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