org.apache.hadoop.hive.ql.exec.mr
Class ExecMapper
java.lang.Object
org.apache.hadoop.mapred.MapReduceBase
org.apache.hadoop.hive.ql.exec.mr.ExecMapper
- All Implemented Interfaces:
- Closeable, org.apache.hadoop.mapred.JobConfigurable, org.apache.hadoop.mapred.Mapper
public class ExecMapper
- extends org.apache.hadoop.mapred.MapReduceBase
- implements org.apache.hadoop.mapred.Mapper
ExecMapper is the generic Map class for Hive. Together with ExecReducer it is
the bridge between the map-reduce framework and the Hive operator pipeline at
execution time. It's main responsabilities are:
- Load and setup the operator pipeline from XML
- Run the pipeline by transforming key value pairs to records and forwarding them to the operators
- Stop execution when the "limit" is reached
- Catch and handle errors during execution of the operators.
Method Summary |
void |
close()
|
void |
configure(org.apache.hadoop.mapred.JobConf job)
|
static boolean |
getDone()
|
boolean |
isAbort()
|
void |
map(Object key,
Object value,
org.apache.hadoop.mapred.OutputCollector output,
org.apache.hadoop.mapred.Reporter reporter)
|
void |
setAbort(boolean abort)
|
static void |
setDone(boolean done)
|
l4j
public static final org.apache.commons.logging.Log l4j
memoryMXBean
public static MemoryMXBean memoryMXBean
ExecMapper
public ExecMapper()
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 key,
Object value,
org.apache.hadoop.mapred.OutputCollector output,
org.apache.hadoop.mapred.Reporter reporter)
throws IOException
- Specified by:
map
in interface org.apache.hadoop.mapred.Mapper
- Throws:
IOException
close
public void close()
- Specified by:
close
in interface Closeable
- Overrides:
close
in class org.apache.hadoop.mapred.MapReduceBase
getDone
public static boolean getDone()
isAbort
public boolean isAbort()
setAbort
public void setAbort(boolean abort)
setDone
public static void setDone(boolean done)
Copyright © 2014 The Apache Software Foundation. All rights reserved.