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Inner join hive queries stuck at reduce phase in CDH 5.12

Inner join hive queries stuck at reduce phase in CDH 5.12

New Contributor

The hive query is getting stuck at reduce phase indefinitely. Some reduce tasks are stuck at 66.67% and some at 100%. After some time due to timeout the whole query fails.

 

Following is the query:

 

select a.*, b.*
from table1 b
inner join table2 a
on b.channel = a.channel.

 

One table is of around 100GB and other is of around 1GB.