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https://issues.apache.org/jira/browse/HADOOP-15566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16530630#comment-16530630
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Ben Sigelman commented on HADOOP-15566:
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The screenshots are really nice to see!
I'm not sure how you all like to work, but I am happy to help discuss how to
make all of this work from an OpenTracing best-practices standpoint (and/or try
to find people to help with the instrumentation or porting effort).
There was a question about about Tracer impls:
{quote}I can see people might want an implementation that is more neutral, For
example, Jaeger comes from Uber, and people might not want to use it (hey, any
Lyft developers here? :))
{quote}
Typically the idiom is to let the user pass in a `Tracer` impl dynamically, but
fall back on the `GlobalTracer` mechanism if no user-specified `Tracer` was
provided. There's also a contributed (and wholly optional) OpenTracing utility
to do `Tracer` injection dynamically (i.e., with zero code modification):
[https://github.com/opentracing-contrib/java-tracerresolver]
Also, re wire protocols: OpenTracing is designed to be intentionally agnostic
about wire protocols and abstracts serialization ("injection") and
deserialization ("extraction") into the `Tracer` implementation. If there are
questions about best practices around this, please @-mention me and I'll do my
best to help.
(Thanks again, all)
> 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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