This provides the number of possible concurrent compactions for Cassandra. This can be configured, but would require a restart of Cassandra for that config to be reflected. This can also be increased using setconcurrentcompactors, but it will also be reset when Cassandra is restarted. It can be used as a quick fix during issues with nodes or while bootstrapping a node:
$CASSANDRA_HOME/bin/nodetool getconcurrentcompactors
The output of the preceding command is as follows:
Figure 7.13: getconcurrentcompactors
