Configuring the Parquet Block Size

The default value for the store.parquet.block-size parameter is 268435456 (256 MB), the same size as filesystem chunk sizes. In previous versions of Drill, the default value was 536870912 (512 MB).

If you change the filesystem chunk size, change the Parquet block size to match using the ALTER SYSTEM or SET commands, as shown:
ALTER SYSTEM SET `store.parquet.block-size` = <value>;  
[ALTER SESSION] SET `store.parquet.block-size` = <value>
Alternatively, you can override the default setting in the <DRILL_HOME>/conf/drill-override.conf file, as shown:
drill.exec: {
  ... = 268435456

For information about setting the filesystem chunk size, see Setting Chunk Size.