Thiruvel Thirumoolan created HBASE-20545:
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Summary: Improve performance of BaseLoadBalancer.retainAssignment
Key: HBASE-20545
URL: https://issues.apache.org/jira/browse/HBASE-20545
Project: HBase
Issue Type: Improvement
Components: Balancer
Affects Versions: 2.0.0, 1.4.4
Reporter: Thiruvel Thirumoolan
Assignee: Thiruvel Thirumoolan
Fix For: 1.5.0, 2.0.1, 1.4.5
I was measuring perf at scale with a 1m region table and noticed some
improvements can be made to BaseLoadBalancer.retainAssignment().
retainAssignment() spends a few mins to enable a 1m regions table and also
generates a lot of objects unnecessarily. This jira is to make the most common
case go faster with very minimal changes. A slightly modified version of this
patch takes about 5 seconds for a 1m region table ignoring the time spent in
createCluster(). I think locality can be refreshed during master startup in
different ways without taking time in retainAssignment, but will follow up on
that in subsequent jiras. Leaving it untouched here, but wanted to call out the
time taken without that method.
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