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https://issues.apache.org/jira/browse/HBASE-20546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16505127#comment-16505127
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Thiruvel Thirumoolan commented on HBASE-20546:
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I can move this map to ServerManager, so its always updated. Would that be ok?
Since its called from picker, its significant. It came up when I profiled
balancer on our cluster setup.
> Improve perf of RegionLocationFinder.mapHostNameToServerName
> ------------------------------------------------------------
>
> Key: HBASE-20546
> URL: https://issues.apache.org/jira/browse/HBASE-20546
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 1.4.4, 2.0.0
> Reporter: Thiruvel Thirumoolan
> Assignee: Thiruvel Thirumoolan
> Priority: Major
> Fix For: 1.5.0, 2.0.1, 1.4.6
>
> Attachments: HBASE-20546.branch-1.4.001.patch
>
>
> RegionLocationFinder.getTopBlockLocations() is called multiple times during
> balancer. While profiling on a large table balance, mapHostNameToServerName()
> seem to take a lot of time. One of the maps is repeatedly created for each
> iteration, while we can just initialize it once.
> Goes into both branch-1 and branch-2, although patches differ slightly.
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