Desired number of blocks (each ~1 MB before compression) in a mini-segment before merge. Mini-segments will get closed earlier if expired due to FLUSH_BLOCK_SECONDS. The value in BLOCKS_PER_MINISEGMENT is used as the default value for MINISEGMENT_PREMERGE_MAX_BLOCKS.

See BLOCKS_PER_SEGMENT below for an example of this variable and more information.