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https://issues.apache.org/jira/browse/HBASE-26366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17539463#comment-17539463
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Nick Dimiduk commented on HBASE-26366:
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In fact this is not just Master startup, but Region Server startup as well.
> ZK interaction during Master startup produces loads of root-less spans
> ----------------------------------------------------------------------
>
> Key: HBASE-26366
> URL: https://issues.apache.org/jira/browse/HBASE-26366
> Project: HBase
> Issue Type: Improvement
> Components: tracing
> Affects Versions: 2.5.0, 3.0.0-alpha-2
> Reporter: Nick Dimiduk
> Assignee: Nick Dimiduk
> Priority: Major
> Fix For: 2.6.0, 3.0.0-alpha-3
>
> Attachments: image.png,
> regroup-spans-for-recoverablezookeeper.create.png
>
>
> Enable tracing with {{-Dotel.traces.sampler=always_on}} and launch the
> standalone master, check the trace store. We see lots of single-span traces,
> each a call to different {{RecoverableZooKeeper}} methods, like {{create}}
> and {{exists}}. Whatever master startup thread this is should define its own
> root span.
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