Run a tablet rebalancing tool on a rack-aware cluster
It is possible to use the kudu cluster rebalance
tool to establish
the placement policy on a cluster. This might be necessary when the rack awareness feature is
first configured or when re-replication violated the placement policy.
-
The rack-aware rebalancer tries to establish the placement policy. Use the
‑‑disable_policy_fixer
flag to skip this phase. -
The rebalancer tries to balance load by location, moving tablet replicas between
locations in an attempt to spread tablet replicas among locations evenly. The load
of a location is measured as the total number of replicas in the location divided by
the number of tablet servers in the location. Use the
‑‑disable_cross_location_rebalancing
flag to skip this phase. -
The rebalancer tries to balance the tablet replica distribution within each
location, as if the location were a cluster on its own. Use the
‑‑disable_intra_location_rebalancing
flag to skip this phase.
By using the ‑‑report_only
flag, it’s also possible to check if
all tablets in the cluster conform to the placement policy without attempting any
replica movement.