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Reduce the default block size from 512MB -> 128MB

Description

We previously set the default block size to 512MB to better leverage large sequential reads from memory. However, with tiered storage, it is not guaranteed that memory is the data source or even the most common data source. Also, columnar file formats do not really benefit from such large blocks due to their internal blocks.

Environment

None

Status

Assignee

Calvin Jia

Reporter

Calvin Jia

Labels

None

Components

Affects versions

1.8.1

Priority

Minor