# Nodetool cluster repair

**cluster repair** - A process that runs in the background and synchronizes the data between nodes. It only repairs keyspaces with tablets enabled (default).
To repair keyspaces with tablets disabled (vnodes-based), see [nodetool repair](https://docs.scylladb.com/manual/master/operating-scylla/nodetool-commands/repair.md).

Running `cluster repair` on a **single node** synchronizes all data on all nodes in the cluster.

To synchronize all data in clusters that have both tablets-based and vnodes-based keyspaces, run [nodetool repair -pr](https://docs.scylladb.com/manual/master/operating-scylla/nodetool-commands/repair.md) on **all**
of the nodes in the cluster, and [nodetool cluster repair](https://docs.scylladb.com/manual/master/operating-scylla/nodetool-commands/cluster/repair.md) on  **any** of the nodes in the cluster.

#### WARNING
[Colocated Tables](https://docs.scylladb.com/manual/master/reference/glossary.md#term-Colocated-Table) cannot be synchronized using cluster repair in this version.

To check if a keyspace enables tablets, use:

```cql
DESCRIBE KEYSPACE `keyspace_name`
```

ScyllaDB node will ensure the exclusivity of tablet repair and maintenance operations (add/remove/decommission/replace/rebuild).

ScyllaDB nodetool cluster repair command supports the following options:

- `-dc` `--in-dc` syncs data between all nodes in a list of Data Centers (DCs).

  #### WARNING
  This command leaves part of the data subset (all remaining DCs) out of sync.

  For example:
  ```default
  nodetool cluster repair -dc US_DC
  nodetool cluster repair --in-dc US_DC, EU_DC
  ```
- `-hosts` `--in-hosts` syncs the data only between a list of nodes, using host ID.

  #### WARNING
  this command leaves part of the data subset (on nodes that are *not* listed) out of sync.

  For example:
  ```default
  nodetool cluster repair -hosts cdc295d7-c076-4b07-af69-1385fefdb40b,2dbdf288-9e73-11ea-bb37-0242ac130002
  nodetool cluster repair --in-hosts cdc295d7-c076-4b07-af69-1385fefdb40b,2dbdf288-9e73-11ea-bb37-0242ac130002,3a5993f8-9e73-11ea-bb37-0242ac130002
  ```
- `--tablet-tokens` selects which tablets to repair. When the listed token belongs to a tablet, the whole tablet that owns the token will be repaired. By default, all tablets are repaired.

  #### WARNING
  this command leaves part of the data subset (on nodes that are *not* listed) out of sync.

  For example:
  ```default
  nodetool cluster repair --tablet-tokens 1,10474535988
  ```
- `--incremental-mode` specifies the incremental repair mode. Can be ‘disabled’, ‘incremental’, or ‘full’. ‘incremental’: The incremental repair logic is enabled. Unrepaired sstables will be included for repair. Repaired sstables will be skipped. The incremental repair states will be updated after repair. ‘full’: The incremental repair logic is enabled. Both repaired and unrepaired sstables will be included for repair. The incremental repair states will be updated after repair. ‘disabled’: The incremental repair logic is disabled completely. The incremental repair states, e.g., repaired_at in sstables and sstables_repaired_at in the system.tablets table, will not be updated after repair. When the option is not provided, it defaults to incremental.

  For example:
  ```default
  nodetool cluster repair --incremental-mode disabled
  ```
- `keyspace` executes a repair on a specific keyspace. The default is all keyspaces.

  For example:
  ```default
  nodetool cluster repair <my_keyspace>
  ```
- `table` executes a repair on a specific table or a list of space-delimited table names. The default is all tables.

  For example:
  ```default
  nodetool cluster repair <my_keyspace> <my_table>
  ```

See also [ScyllaDB Manager](https://manager.docs.scylladb.com/).