Biju Nair created HBASE-22306:
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Summary: Improve SLB to distribute table regions across all region
servers
Key: HBASE-22306
URL: https://issues.apache.org/jira/browse/HBASE-22306
Project: HBase
Issue Type: Improvement
Components: Balancer
Reporter: Biju Nair
Noticed in clusters that distribution of regions of tables are skewed. From
quick tests, it looks like that the current table skew cost may not be having
any influence on selecting the target "cluster" candidate.
{noformat}
Cluster:
Nodes regions Tables
5 50 5
Test 1: Initial Distribution
———————————
Table 0 regions [1, 1, 2, 4, 2]
Table 1 regions [1, 2, 4, 2, 2]
Table 2 regions [0, 2, 2, 0, 4]
Table 3 regions [0, 5, 0, 2, 3]
Table 4 regions [0, 2, 4, 4, 1]
Test 1: After Balancer Run
———————————
Table 0 regions [2, 2, 2, 2, 2]
Table 1 regions [2, 2, 3, 2, 2]
Table 2 regions [1, 2, 2, 2, 1]
Table 3 regions [2, 3, 0, 2, 3]
Table 4 regions [3, 1, 3, 2, 2]
Test 2: Initial Distribution
———————————
Table 0 regions [2, 1, 0, 1, 2]
Table 1 regions [5, 1, 1, 2, 1]
Table 2 regions [2, 4, 0, 2, 4]
Table 3 regions [1, 4, 1, 3, 1]
Table 4 regions [2, 2, 0, 4, 4]
Test 2: After Balancer Run
———————————-
Table 0 regions [1, 2, 2, 1, 0]
Table 1 regions [2, 2, 2, 2, 2]
Table 2 regions [3, 3, 1, 2, 3]
Table 3 regions [2, 2, 2, 2, 2]
Table 4 regions [2, 1, 3, 3, 3]{noformat}
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