[HBASE-24418] Consolidate Normalizer implementations

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha-1, 2.3.0
• Fix Version/s: 3.0.0-alpha-1, 2.3.0
• Component/s: master, Normalizer

Release Note

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This change extends the Normalizer with a handful of new configurations. The configuration points supported are:
* `hbase.normalizer.split.enabled` Whether to split a region as part of normalization. Default: `true`.
* `hbase.normalizer.merge.enabled` Whether to merge a region as part of normalization. Default `true`.
* `hbase.normalizer.min.region.count` The minimum number of regions in a table to consider it for merge normalization. Default: 3.
* `hbase.normalizer.merge.min_region_age.days` The minimum age for a region to be considered for a merge, in days. Default: 3.
* `hbase.normalizer.merge.min_region_size.mb` The minimum size for a region to be considered for a merge, in whole MBs. Default: 1.

• Assignee: Nick Dimiduk
• Reporter: Nick Dimiduk
• Created: 22/May/20 16:04
• Updated: 25/Mar/21 15:06
• Resolved: 03/Jun/20 23:45

Description

After HBASE-22285, we have two implementations of RegionNormalizer, that have different feature sets and different configurations. I think these can be combined into a single implementation, with clear, decoupled configuration parameters. At least on branch-2.3, there's too many subsequent changes for HBASE-22285 to revert cleanly, so I'll use this ticket to consolidate the implementations.

If you have issues with the current normalizer, speak up here and we can include them, or add them as sub-tasks.

Issue Links

• supercedes: HBASE-22285 A normalizer which merges very small size regions with adjacent regions.(MergeToNormalize)
• links to: GitHub Pull Request #1786
• links to: GitHub Pull Request #1833
• links to: GitHub Pull Request #1834