[HBASE-26649] Support meta replica LoadBalance mode for RegionLocator#getAllRegionLocations() - ASF JIRA

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Details

Type: Improvement
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: 2.4.9
Fix Version/s: 2.5.0, 3.0.0-alpha-3, 2.4.13
Component/s: meta replicas
Labels:
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Release Note:

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When setting 'hbase.locator.meta.replicas.mode' to "LoadBalance" at HBase client, RegionLocator#getAllRegionLocations() now load balances across all Meta Replica Regions. Please note, results from non-primary meta replica regions may contain stale data.

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When setting 'hbase.locator.meta.replicas.mode' to "LoadBalance" at HBase client, RegionLocator#getAllRegionLocations() now load balances across all Meta Replica Regions. Please note, results from non-primary meta replica regions may contain stale data.

Description

When HBase application restarts, its meta cache is empty. Normally, it will fill the meta cache one region at a time by scanning the meta region. This will cause huge pressure to the region server hosting meta during application restart.

It can prefetching all region locations by calling RegionLocator#getAllRegionLocations().Meta replica LoadBalance mode is support in 2.4, it will be nice to load balance RegionLocator#getAllRegionLocations() to all meta replica regions so batch scan can spread across all meta replica regions.