HIVE_CANNOT_OPEN_SPLIT: Error opening Hive split s3://bucket_1/parquet_sample/data_10720000_1 (offset=0, length=16981465): org.apache.parquet.io.GroupColumnIO cannot be cast

Question

I converted a couple of compressed json files into parquet files with default snappy compression. The resulting files total less than 50MB. I am not sure why Athena throws this error. I read the background behind the error but I don't understand how Athena is querying several thousands of files which result in this error.
I can run a simple select count(*) from table but a select * from table query fails

The json file had to be read line by line due to trailing error I encountered in Python.

Any idea why this occurs?

Accepted Answer

Hi There

I don't think this is related to the S3 rate-limiting topic that comes up when you search this error.  You would see something like "Slow Down" if that was the case.  The key is in the last part of the error

`org.apache.parquet.io.GroupColumnIO cannot be cast`

This error is probably caused by  a parquet schema mismatch.  Check your table creation query and test with a smaller subset of the data.  There may be some issues with the data format or the table config.  see https://docs.aws.amazon.com/athena/latest/ug/troubleshooting-athena.html

Answer

Thanks for the response!

HIVE_CANNOT_OPEN_SPLIT: Error opening Hive split s3://bucket_1/parquet_sample/data_10720000_1 (offset=0, length=16981465): org.apache.parquet.io.GroupColumnIO cannot be cast

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