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From Daniel Haviv <>
Subject Insert into dynamic partitions performance
Date Sat, 06 Dec 2014 14:27:23 GMT
I'm executing an insert statement that goes over 1TB of data.
The map phase goes well but the reduce stage only used one reducer which becomes a great bottleneck.

 I've tried to set the number of reducers to four and added a distribute by clause to the
statement but I'm still using just one reducer.

How can I increase the reducer's parallelism?

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