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https://issues.apache.org/jira/browse/HTRACE-119?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin Patrick McCabe resolved HTRACE-119.
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Resolution: Fixed
Fix Version/s: 3.2.0
Committed to 3.2. Thanks, very good catch!
> detach of NullScope singleton should not fail
> ---------------------------------------------
>
> Key: HTRACE-119
> URL: https://issues.apache.org/jira/browse/HTRACE-119
> Project: HTrace
> Issue Type: Bug
> Affects Versions: master
> Reporter: Masatake Iwasaki
> Assignee: Masatake Iwasaki
> Fix For: 3.2.0
>
> Attachments: HTRACE-119.001.patch, HTRACE-119.002.patch,
> HTRACE-119.003.patch
>
>
> The {{detach}} method of NullScope singleton is possible to be called
> multiple times by users avoiding conditionals by the assumption that
> NullScope#close and NullScope#detach results in no-op. Calling {{detach}} of
> NullScope singleton multiple times throws RuntimeException by HTRACE-101 now.
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