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https://issues.apache.org/jira/browse/HBASE-12557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14221643#comment-14221643
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stack commented on HBASE-12557:
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I'd suggest also breaking dns so you get long timeout and seeing if the cancel
actual cancels the ongoing lookup and doesn't leave resources laying around
> Introduce timeout mechanism for IP to rack resolution
> -----------------------------------------------------
>
> Key: HBASE-12557
> URL: https://issues.apache.org/jira/browse/HBASE-12557
> Project: HBase
> Issue Type: Improvement
> Reporter: Ted Yu
> Assignee: Ted Yu
> Attachments: 12557-v1.txt
>
>
> Config parameter, "hbase.util.ip.to.rack.determiner", determines the class
> which does IP to rack resolution.
> The actual resolution may be lengthy.
> This JIRA is continuation of HBASE-12554 where a mock DNSToSwitchMapping is
> used for rack resolution.
> A timeout parameter, "hbase.ip.to.rack.determiner.timeout", is proposed whose
> value governs the duration which RackManager waits before rack resolution is
> stopped.
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