Region Balancer

This plugin balances the write load of regions across datanodes, using specified window sizes and load thresholds to prevent frequent region migrations.

[[plugins]]
[plugins.region_balancer]

window_size = "45s"

window_stability_threshold = 2

min_load_threshold = "10MB"

tick_interval = "45s"

Configuration Parameters

• window_size: string
  • Description: Defines the time span for the sliding window used to calculate the short-term average load of a region. This window helps smooth out temporary spikes in load, reducing the chance of unnecessary rebalancing.
  • Units: Time (e.g., "45s" represents 45 seconds).
  • Recommendation: Adjust according to load volatility. Larger values smooth more effectively but may delay load balancing responses.
• window_stability_threshold: integer
  • Description: Specifies the number of consecutive windows that must meet the load-balancing criteria before a region migration is triggered. This threshold helps prevent frequent balancing actions, ensuring region migration only occurs when imbalance is sustained.
  • Recommendation: Higher values delay rebalancing triggers and suit environments with volatile loads; a value of 2 means that at least two consecutive windows must meet the threshold before triggering.
• min_load_threshold: string
  • Description: Minimum write load threshold (in bytes per second) to trigger region migration. Nodes with load below this value will not trigger rebalancing.
  • Units: Bytes (e.g., "10MB" represents 10 MiB).
  • Recommendation: Set an appropriate minimum to avoid triggering region migration with low load. Adjust based on typical traffic.
• tick_interval: string
  • Description: Interval at which the balancer checks and potentially triggers a rebalancing task.
  • Units: Time (e.g., "45s" represents 45 seconds).
  • Recommendation: Set based on desired responsiveness and load volatility. Shorter intervals allow faster responses but may increase overhead.