org.apache.hadoop.hive.ql.stats

Class BasicStatsTask

java.lang.Object

org.apache.hadoop.hive.ql.stats.BasicStatsTask

All Implemented Interfaces:

Serializable, IStatsProcessor

public class BasicStatsTask
extends Object
implements Serializable, IStatsProcessor

StatsTask implementation. StatsTask mainly deals with "collectable" stats. These are stats that require data scanning and are collected during query execution (unless the user explicitly requests data scanning just for the purpose of stats computation using the "ANALYZE" command. All other stats are computed directly by the MetaStore. The rationale being that the MetaStore layer covers all Thrift calls and provides better guarantees about the accuracy of those stats.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected SessionState.LogHelper	console
boolean	followedColStats

Constructor Summary

Constructors

Constructor and Description
BasicStatsTask(HiveConf conf, BasicStatsWork work)

Method Summary

Modifier and Type	Method and Description
static String	getAggregationPrefix(Table table, Partition partition)
Collection<Partition>	getDpPartSpecs()
String	getName()
StageType	getType()
void	initialize(CompilationOpContext opContext)
int	process(Hive db, Table tbl)
void	setDpPartSpecs(Collection<Partition> dpPartSpecs)

Methods inherited from class java.lang.Object

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

Field Detail

followedColStats

public boolean followedColStats

console

protected transient SessionState.LogHelper console

Constructor Detail

BasicStatsTask

public BasicStatsTask(HiveConf conf,
                      BasicStatsWork work)

Method Detail

process

public int process(Hive db,
                   Table tbl)
            throws Exception

Specified by:

process in interface IStatsProcessor

Throws:

Exception

initialize

public void initialize(CompilationOpContext opContext)

Specified by:

initialize in interface IStatsProcessor

getType

public StageType getType()

getName

public String getName()

getDpPartSpecs

public Collection<Partition> getDpPartSpecs()

setDpPartSpecs

public void setDpPartSpecs(Collection<Partition> dpPartSpecs)

Specified by:

setDpPartSpecs in interface IStatsProcessor

getAggregationPrefix

public static String getAggregationPrefix(Table table,
                                          Partition partition)
                                   throws org.apache.hadoop.hive.metastore.api.MetaException

Throws:

org.apache.hadoop.hive.metastore.api.MetaException