nodetool upgradesstables 

Rewrites SSTables for tables that are not running the current version of Cassandra.

Rewrites SSTables for tables that are not running the current version of Cassandra.

Synopsis 

$ nodetool <options> upgradesstables
 ( -a | --include-all-sstables ) 
 -- <keyspace>  <table> ... 
DataStax Enterprise 5.0 Installer No-Services and tarball installations:
installation_location/resources/cassandra/bin
Options
Short Long Description
-h --host Hostname or IP address.
-j --job Number of sstables to upgrade simultaneously; 0 uses all available threads.
-p --port Port number.
-pwf --password-file Password file path.
-pw --password Password.
-u --username Remote JMX agent username.
-a --include-all-sstables Snapshot name.
keyspace Name of keyspace.
table One or more table names, separated by a space.
-- Separates an option from an argument that could be mistaken for a option.

Description 

Rewrites SSTables on a node that are incompatible with the current version. Use this command when upgrading your server or changing compression options.