Wellington Chevreuil created HBASE-29168:
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Summary: Add configurable throttling of region moves in
CacheAwareLoadBalancer.
Key: HBASE-29168
URL: https://issues.apache.org/jira/browse/HBASE-29168
Project: HBase
Issue Type: Improvement
Reporter: Wellington Chevreuil
Assignee: Wellington Chevreuil
On use cases where cache hits are critical, such as when using cloud storage,
it might be preferable to slow down the execution of region moves from a
balancer plan, if the target RegionServer has low cache ratio for the given
region.
This implements a region move throttling logic in the CacheAwareLoadBalancer,
where if the cache ratio for the region in target RegionServer from the region
plan is below a configurable threshold, it sleeps the moving thread for a
configurable time in milliseconds.
This also overrides balanceCluster method in CacheAwareLoadBalancer, so that it
sorts the generated region plan by descending order of cache ratio in the
target server, so that regions with cache ratio above the configured threshold
can be move first without any throttling.
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