Improve RegionSplitter Performance
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Key: HBASE-3610
URL: https://issues.apache.org/jira/browse/HBASE-3610
Project: HBase
Issue Type: Improvement
Reporter: Nicolas Spiegelberg
Assignee: Nicolas Spiegelberg
Priority: Trivial
When running RegionSplitter on a 100-node cluster with 900 regions (and plenty
of data), the utility took around 72 hours to run. Analysis revealed two major
bottlenecks:
1. We are serialized on the logical split (i.e. waiting for the split request
to be registered). Parallelizing this step will align configured and actual
outstanding splits.
2. Outstanding splits are modeled like a queue. Changing this to a list with a
scanner will allow handling splits that finish out of order.
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