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https://issues.apache.org/jira/browse/HBASE-20545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16482964#comment-16482964
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Thiruvel Thirumoolan commented on HBASE-20545:
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Thanks [~apurtell], [~yuzhih...@gmail.com] and [~aoxiang] for reviews.
> 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: 1.4.4, 2.0.0
> Reporter: Thiruvel Thirumoolan
> Assignee: Thiruvel Thirumoolan
> Priority: Major
> Fix For: 3.0.0, 2.1.0, 1.5.0, 1.3.3, 1.4.5
>
> Attachments: HBASE-20545.branch-1.4.001.patch,
> HBASE-20545.branch-1.4.002.patch, HBASE-20545.branch-2.001.patch
>
>
> 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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