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https://issues.apache.org/jira/browse/HBASE-22306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16825615#comment-16825615
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Biju Nair commented on HBASE-22306:
-----------------------------------
Attached a modified {{TableSkewCostFunction}} (TableSkewCostFunctionNew.rtf)
and quick test results similar to the one documented in the description of the
ticket. The tests shows improvement in the distribution but require additional
tests. Any comments/suggestions and other alternative approaches?
{noformat}
Cluster:
Nodes regions Tables
5 50 5
Test 1: Initial Distribution
—————————
Table 0 regions [2, 2, 1, 2, 0]
Table 1 regions [4, 2, 2, 4, 1]
Table 2 regions [2, 2, 3, 1, 0]
Table 3 regions [2, 3, 3, 4, 1]
Table 4 regions [2, 3, 3, 1, 0]
Test 1: After Balancer Run
—————————
Table 0 regions [1, 2, 1, 2, 1]
Table 1 regions [3, 2, 2, 3, 3]
Table 2 regions [2, 1, 2, 1, 2]
Table 3 regions [2, 3, 3, 3, 2]
Table 4 regions [2, 2, 2, 1, 2]
Test 2: Initial Distribution
—————————
Table 0 regions [3, 0, 3, 2, 1]
Table 1 regions [5, 0, 2, 3, 5]
Table 2 regions [2, 0, 2, 2, 3]
Table 3 regions [2, 1, 1, 0, 1]
Table 4 regions [0, 1, 4, 5, 2]
Test 2: After Balancer Run
—————————
Table 0 regions [2, 2, 2, 2, 1]
Table 1 regions [3, 3, 3, 3, 3]
Table 2 regions [2, 2, 2, 1, 2]
Table 3 regions [1, 1, 1, 1, 1]
Table 4 regions [2, 2, 2, 3, 3]{noformat}
> 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
> Priority: Major
> Labels: balancer
> Attachments: TableSkewCostFunctionNew.rtf
>
>
> 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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