Clara Xiong created HBASE-26178:
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Summary: Improve data structure for BalanceClusterState to improve
computation speed for large cluster
Key: HBASE-26178
URL: https://issues.apache.org/jira/browse/HBASE-26178
Project: HBase
Issue Type: Bug
Reporter: Clara Xiong
With ~800 node and ~500 regions per node on our large production cluster,
balancer cannot complete within hours even after we just add 2% servers after
maintenance.
The unit tests with larger number of regions are taking longer and longer with
changes to balancer with recent changes too, evident with the increment of the
time limit recent PR's included.
It is time to replace some of the data structure for better time complexity
including:
int[][] regionsPerServer; // serverIndex -> region list
int[][] regionsPerHost; // hostIndex -> list of regions
int[][] regionsPerRack; // rackIndex -> region list
// serverIndex -> sorted list of regions by primary region index
ArrayList<HashSet<Integer>> primariesOfRegionsPerServer;
// hostIndex -> sorted list of regions by primary region index
int[][] primariesOfRegionsPerHost;
// rackIndex -> sorted list of regions by primary region index
int[][] primariesOfRegionsPerRack;
which needs O(n) time to update for every move test iteration. (n = number of
regions per server/host/rack).
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