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https://issues.apache.org/jira/browse/HTRACE-275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14940641#comment-14940641
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Colin Patrick McCabe commented on HTRACE-275:
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A few notable things:
* We implement this via a subclass, but we don't make the subclass public (in
case we want to switch to a different implementation later)
* Can't "pull the rug out" from another thread by closing {{NullTracer}}... its
close method does nothing.
* Can't add {{Sampler}} objects to {{NullTracer}}
* {{NullTracer}} is in its own {{SamplerPool}} to avoid causing issues for
applications that iterate over the main sampler pool (like Hadoop once we add
the ability to modify samplers via RPC)
> Add NullTracer which never creates a trace span
> -----------------------------------------------
>
> Key: HTRACE-275
> URL: https://issues.apache.org/jira/browse/HTRACE-275
> Project: HTrace
> Issue Type: Improvement
> Components: api
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Attachments: HTRACE-275.001.patch
>
>
> [~iwasakims] suggested adding a {{NullTracer}} which never creates a trace
> span. This would be more convenient than checking tracer objects against
> null in some cases.
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