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Impala query parquet files from S3

Impala query parquet files from S3

New Contributor

Hi, 

 

I am curious, for using Impala to query parquet files from S3, does it seek only download the needed columns, or it download the whole file first? I remember S3 files being an object so that it doesnt allow to seek specific bytes which is needed to efficiently use parquet files.

 

 

Thanks.

1 REPLY 1
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Re: Impala query parquet files from S3

Cloudera Employee

Impala uses a range get via the S3A connector to download only the column chunks needed.