Package org.apache.hadoop.hive.ql.exec.mr

Interface Summary

Interface	Description
HadoopJobExecHook

Class Summary

Class	Description
ExecDriver	ExecDriver is the central class in co-ordinating execution of any map-reduce task.
ExecMapper	ExecMapper is the generic Map class for Hive.
ExecMapper.ReportStats	reportStats.
ExecMapperContext
ExecMapRunner<K1,V1,K2,V2>
ExecReducer	ExecReducer is the generic Reducer class for Hive.
HadoopJobExecHelper
HashTableLoader	HashTableLoader for MR loads the hashtable for MapJoins from local disk (hashtables are distributed by using the DistributedCache.
JobDebugger	JobDebugger takes a RunningJob that has failed and grabs the top 4 failing tasks and outputs this information to the Hive CLI.
JobTrackerURLResolver	JobTrackerURLResolver.
MapredLocalTask	MapredLocalTask represents any local work (i.e.: client side work) that hive needs to execute.
MapRedTask	Extension of ExecDriver: - can optionally spawn a map-reduce task from a separate jvm - will make last minute adjustments to map-reduce job parameters, viz: * estimating number of reducers * estimating whether job should run locally
ObjectCache	ObjectCache.
Throttle	Intelligence to make clients wait if the cluster is in a bad state.