org.apache.hadoop.hive.ql.io.rcfile.stats
Class PartialScanMapper

java.lang.Object
  org.apache.hadoop.mapred.MapReduceBase
      org.apache.hadoop.hive.ql.io.rcfile.stats.PartialScanMapper

All Implemented Interfaces:

Closeable, org.apache.hadoop.mapred.JobConfigurable, org.apache.hadoop.mapred.Mapper<Object,RCFileValueBufferWrapper,Object,Object>

public class PartialScanMapper
extends org.apache.hadoop.mapred.MapReduceBase
implements org.apache.hadoop.mapred.Mapper<Object,RCFileValueBufferWrapper,Object,Object>

PartialScanMapper. It reads through block header and aggregates statistics at the end. https://issues.apache.org/jira/browse/HIVE-3958

Field Summary

static org.apache.commons.logging.Log

LOG

Constructor Summary

PartialScanMapper()

Method Summary

void	close()
void	configure(org.apache.hadoop.mapred.JobConf job)
void	map(Object k, RCFileValueBufferWrapper value, org.apache.hadoop.mapred.OutputCollector<Object,Object> output, org.apache.hadoop.mapred.Reporter reporter)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOG

public static final org.apache.commons.logging.Log LOG

Constructor Detail

PartialScanMapper

public PartialScanMapper()

Method Detail

configure

public void configure(org.apache.hadoop.mapred.JobConf job)

Specified by:

configure in interface org.apache.hadoop.mapred.JobConfigurable

Overrides:

configure in class org.apache.hadoop.mapred.MapReduceBase

map

public void map(Object k,
                RCFileValueBufferWrapper value,
                org.apache.hadoop.mapred.OutputCollector<Object,Object> output,
                org.apache.hadoop.mapred.Reporter reporter)
         throws IOException

Specified by:

map in interface org.apache.hadoop.mapred.Mapper<Object,RCFileValueBufferWrapper,Object,Object>

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Overrides:

close in class org.apache.hadoop.mapred.MapReduceBase

Throws:

IOException