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java.lang.Object org.apache.hadoop.mapred.lib.MultithreadedMapRunner<K1,V1,K2,V2>
@InterfaceAudience.Public @InterfaceStability.Stable public class MultithreadedMapRunner<K1,V1,K2,V2>
Multithreaded implementation for @link org.apache.hadoop.mapred.MapRunnable.
It can be used instead of the default implementation,
Constructor Summary | |
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MultithreadedMapRunner()
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Method Summary | |
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void |
configure(JobConf jobConf)
Initializes a new instance from a JobConf . |
void |
run(RecordReader<K1,V1> input,
OutputCollector<K2,V2> output,
Reporter reporter)
Start mapping input <key, value> pairs. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public MultithreadedMapRunner()
Method Detail |
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public void configure(JobConf jobConf)
JobConfigurable
JobConf
.
configure
in interface JobConfigurable
jobConf
- the configurationpublic void run(RecordReader<K1,V1> input, OutputCollector<K2,V2> output, Reporter reporter) throws IOException
MapRunnable
Mapping of input records to output records is complete when this method returns.
run
in interface MapRunnable<K1,V1,K2,V2>
input
- the RecordReader
to read the input records.output
- the OutputCollector
to collect the outputrecords.reporter
- Reporter
to report progress, status-updates etc.
IOException
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