Nodetool compactionstats

compactionstats - Print statistics on compactions. Each row represent a running compaction.

For example:

nodetool compactionstats

Example output:

pending tasks: 2
compaction type  keyspace   column family   completed      total         unit   progress
major            nba        player_name     5770708712     55239418023   bytes  10.11%
minor            nba        player_stats    18569428       3610548974    bytes  51.43%
Parameter Description
pending tasks Number of pending compactions
compaction type Type of compaction
keyspace The keyspace name
column family (table) The column family (table) name
completed Completed bytes out of the total
total Total size of the compaction
unit Compaction unit type
progress Compaction progress %

Nodetool Reference