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Impala concurrent refresh & query

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Impala concurrent refresh & query

New Contributor

I'm using Impala with parquet table and staging phase described here:

 
All looks good but I'm wondering how Impala actually handles concurrent read/write? 
I mean, what will happen if  I overwrite a parquet file in the data warehouse and refresh the corresponding table while another person's querying that table?
 
Thanks!