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From Tale Firefly <>
Subject Mechanism when doing a select *
Date Mon, 21 Mar 2016 14:26:36 GMT
Hello guys !

I'm trying to understand the mechanism for a simple query select * from
my_table when using HiveServer2.

I'm using the hortonworks ODBC Driver for HiveServer2.
I just do a select * from my_table.
my_table is an ORC table based on files divised into blocks located on all
my datanodes.
I have 50 datanodes.

My question is the following :
Does all the data go from the datanodes to the node hosting the hiveserver2
before coming back to my client ?
Or does all the data go directly from the datanodes to my client ?

Hope you can help me o/

Thank you


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