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https://issues.apache.org/jira/browse/HADOOP-15566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16623548#comment-16623548
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Carlos Alberto Cortez commented on HADOOP-15566:
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Hi all,
I went ahead and did a Proof-Of-Concept migration from HTrace to OpenTracing
(using Zipkin as the backend). You can inspect (and play with the code) here:
[https://github.com/apache/hadoop/compare/trunk...carlosalberto:ot_initial_integration]
Some notes:
1. It creates by default a Tracer instance based on Zipkin running in localhost
(for simplicity purposes).
2. It uses the notion of a GlobalTracer so create and register and use the
Tracer from a single place.
3. As Wei-Chiu mentioned, it needed some small extra work to pass around the
parent-child relationship (which is done trough `SpanId` in HTrace, and
`SpanContext` in OpenTracing).
4. Added a new SpanContext field in the clases using protobuf to pass trace
info.
As mentioned, this is a POC, but hope this can throw light into this (and I'm
happy to answer questions or contribute with this as an actual migration ;) )
> 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
> Labels: security
> 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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