CODEWITHSUNDEEP
sqlhadoophive
Lin Ma
Lin Ma

Reputation: 10159

Hive query execution issue

When executing a hive query, here is the output, wondering for "Map 1" and "Reducer 2", what does the 1 and 2 mean? 

Map 1: 21/27    Reducer 2: 0/1
Map 1: 22/27    Reducer 2: 0/1
Map 1: 23/27    Reducer 2: 0/1
Map 1: 24/27    Reducer 2: 0/1
Map 1: 26/27    Reducer 2: 0/1
Map 1: 27/27    Reducer 2: 0/1
Map 1: 27/27    Reducer 2: 1/1

thanks in advance, Lin

Upvotes: 0

Views: 78

Answers (1)

Vamsi Prabhala
Vamsi Prabhala

Reputation: 49270

The hive query is interpreted by the MapReduce framework as a Map-Reduce task. The task gets assigned mappers and reducers based on the input. When the task is in progress you can see the output displayed in terms of mappers and reducers progress.

Upvotes: 1

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