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https://issues.apache.org/jira/browse/HADOOP-15566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16552907#comment-16552907
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Ben Sigelman commented on HADOOP-15566:
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[~elek] the projects have similar goals but take different approaches.
OpenTracing's surface area is intentionally "as narrow as possible" which means
that it brings in almost no dependencies (OpenCensus is more of a
fully-featured "agent" model, which necessarily gives it a larger footprint).
OpenTracing also makes no assumptions about the serialization formats (or
header names, etc) between peered processes in the distributed
system/application, or the serialization format of the tracing system itself.
This means that OpenTracing instrumentation can be used/reused for a wider
variety of things: straightforward distributed trace
collectors/indexers/viewers like Zipkin, Jaeger, etc, but also distributed
debuggers, security applications, and so forth.
Also, building a general-purpose adapter to convert OpenTracing instrumentation
into OpenCensus API calls would be straightforward (due to the relative
"thickness" and numbers of implementation assumptions made in each project).
Going the other way would be challenging or impossible, depending on reliance
on OpenCensus wire formats.
> Remove HTrace support
> ---------------------
>
> Key: HADOOP-15566
> URL: https://issues.apache.org/jira/browse/HADOOP-15566
> Project: Hadoop Common
> Issue Type: Improvement
> Components: metrics
> Affects Versions: 3.1.0
> Reporter: Todd Lipcon
> Priority: Major
> Attachments: Screen Shot 2018-06-29 at 11.59.16 AM.png,
> ss-trace-s3a.png
>
>
> The HTrace incubator project has voted to retire itself and won't be making
> further releases. The Hadoop project currently has various hooks with HTrace.
> It seems in some cases (eg HDFS-13702) these hooks have had measurable
> performance overhead. Given these two factors, I think we should consider
> removing the HTrace integration. If there is someone willing to do the work,
> replacing it with OpenTracing might be a better choice since there is an
> active community.
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