Incremental repairs 

Overview of incremental repairs, including considerations and limitations when running and configuring incremental repairs within OpsCenter.

OpsCenter performs an incremental repair on a user-configured set of tables every time a subrange repair on the mutually exclusive set of other tables is run on a given node. A user-configurable option (incremental_range_repair) controls whether to repair just the subrange or the entire range of the node. The default is to repair the entire range of the node.

Note: If a cluster is multi-datacenter and there is a keyspace that only exists in one datacenter, it might be a while between incremental repairs in that datacenter because the Repairs Service currently repairs an entire datacenter at a time.

After manually migrating a table to use incremental repair, update the user-configured list of tables in the incremental_repair_tables configuration option. Any incorrectly formatted table logs an error. Read more about efficient incremental repairs in the DataStax Developer blog post. For information on migrating to incremental repairs in Cassandra, see migrating to incremental repairs.

opscenterd.conf 

The location of the opscenterd.conf file depends on the type of installation:

  • Package installations: /etc/opscenter/opscenterd.conf
  • Tarball installations: install_location/conf/opscenterd.conf

cluster_name.conf 

The location of the cluster_name.conf file depends on the type of installation:

  • Package installations: /etc/opscenter/clusters/cluster_name.conf
  • Tarball installations: install_location/conf/clusters/cluster_name.conf

Configuration options for incremental repair

The following is currently configurable by adding a [repair_service] section to the opscenterd.conf file to apply to all clusters, or per cluster by adding the section to the cluster_name.conf file. Settings in cluster_name.conf override any settings in opscenterd.conf.

[repair_service] incremental_repair_tables
The list of keyspaces and tables to include in incremental repairs. (e.g. Keyspace1.Standard1, Keyspace1.Standard2)
[repair_service] incremental_range_repair
Determines whether incremental repairs run as subrange repairs (True) or repair the node's entire range (False). Default: False.
[repair_service] incremental_err_alert_threshold
The threshold for the number of errors during incremental repair to ignore before alerting that incremental repair seems to be failing more than an acceptable amount.