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java.lang.Objectorg.apache.hadoop.mapreduce.RecordReader<ImmutableBytesWritable,Result>
org.apache.hadoop.hbase.mapreduce.TableRecordReader
@InterfaceAudience.Public @InterfaceStability.Stable public class TableRecordReader
Iterate over an HBase table data, return (ImmutableBytesWritable, Result) pairs.
| Constructor Summary | |
|---|---|
TableRecordReader()
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| Method Summary | |
|---|---|
void |
close()
Closes the split. |
ImmutableBytesWritable |
getCurrentKey()
Returns the current key. |
Result |
getCurrentValue()
Returns the current value. |
float |
getProgress()
The current progress of the record reader through its data. |
void |
initialize(org.apache.hadoop.mapreduce.InputSplit inputsplit,
org.apache.hadoop.mapreduce.TaskAttemptContext context)
Initializes the reader. |
boolean |
nextKeyValue()
Positions the record reader to the next record. |
void |
restart(byte[] firstRow)
Restart from survivable exceptions by creating a new scanner. |
void |
setHTable(HTable htable)
Sets the HBase table. |
void |
setScan(Scan scan)
Sets the scan defining the actual details like columns etc. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public TableRecordReader()
| Method Detail |
|---|
public void restart(byte[] firstRow)
throws IOException
firstRow - The first row to start at.
IOException - When restarting fails.public void setHTable(HTable htable)
htable - The HTable to scan.public void setScan(Scan scan)
scan - The scan to set.public void close()
close in interface Closeableclose in class org.apache.hadoop.mapreduce.RecordReader<ImmutableBytesWritable,Result>RecordReader.close()
public ImmutableBytesWritable getCurrentKey()
throws IOException,
InterruptedException
getCurrentKey in class org.apache.hadoop.mapreduce.RecordReader<ImmutableBytesWritable,Result>IOException
InterruptedException - When the job is aborted.RecordReader.getCurrentKey()
public Result getCurrentValue()
throws IOException,
InterruptedException
getCurrentValue in class org.apache.hadoop.mapreduce.RecordReader<ImmutableBytesWritable,Result>IOException - When the value is faulty.
InterruptedException - When the job is aborted.RecordReader.getCurrentValue()
public void initialize(org.apache.hadoop.mapreduce.InputSplit inputsplit,
org.apache.hadoop.mapreduce.TaskAttemptContext context)
throws IOException,
InterruptedException
initialize in class org.apache.hadoop.mapreduce.RecordReader<ImmutableBytesWritable,Result>inputsplit - The split to work with.context - The current task context.
IOException - When setting up the reader fails.
InterruptedException - When the job is aborted.RecordReader.initialize(
org.apache.hadoop.mapreduce.InputSplit,
org.apache.hadoop.mapreduce.TaskAttemptContext)
public boolean nextKeyValue()
throws IOException,
InterruptedException
nextKeyValue in class org.apache.hadoop.mapreduce.RecordReader<ImmutableBytesWritable,Result>true if there was another record.
IOException - When reading the record failed.
InterruptedException - When the job was aborted.RecordReader.nextKeyValue()public float getProgress()
getProgress in class org.apache.hadoop.mapreduce.RecordReader<ImmutableBytesWritable,Result>RecordReader.getProgress()
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