nodetool scrub 

Rebuild SSTables for one or more Cassandra tables.

Rebuild SSTables for one or more Cassandra tables.

Synopsis 

$ nodetool <options> scrub <keyspace> --  -ns | --no-snapshot   -s | --skip-corrupted   <table> ... 
Options
Short Long Description
-h --host Hostname or IP address.
-j --job Number of sstables to scrub simultaneously; 0 uses all available compaction threads.
-p --port Port number.
-pwf --password-file Password file path.
-pw --password Password.
-u --username Remote JMX agent username.
-s --skip-corrupted Skip corrupted partitions even when scrubbing counter tables (default false).
-n --no-validate Do not validate columns using column validator.
-ns --no-snapshot Triggers a snapshot of the scrubbed table first assuming snapshots are not disabled (default).
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 

Rebuilds SSTables on a node for the named tables and snapshots data files before rebuilding as a safety measure. If possible use nodetool upgradesstables. While scrub rebuilds SSTables, it also discards data that it deems broken and creates a snapshot, which you have to remove manually. If the --no-snapshot option is specified, snapshot creation is disabled. If scrub can't validate the column value against the column definition's data type, it logs the partition key and skips to the next partition. Skipping corrupted partitions in tables having counter columns results in under-counting. By default the scrub operation stops if you attempt to skip such a partition. To force the scrub to skip the partition and continue scrubbing, re-run nodetool scrub using the --skip-corrupted option.