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https://issues.apache.org/jira/browse/HADOOP-15566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16553144#comment-16553144
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stack commented on HADOOP-15566:
--------------------------------
For me, the hard part is not which tracing lib to use -- if a tracing lib
discussion, lets do it out on dev? We should also invite others to the
discussion -- but rather discussion around resourcing:
* Ensuring traces tell a good narrative across the different code paths and
over processes, and that trace paths remain intact across code churn; they are
brittle and easily broken/disconnected as dev goes on.
* Instrumenting/coverage -- inserting trace points is time consuming whose
value is only realized down-the-road by operator/dev trying to figure a
slowdown (so the https://github.com/opentracing-contrib/java-tracerresolver
looks interesting).
* Tooling to enable tracing and visualize needs to be easy-to-deploy and use
else all will go to rot (Some orgs trace every transaction with a simple switch
for dumping to visualizer that is up and always available..)
* Ensuring traces are friction-free else they'll be removed or not taken-on in
the first place.
* Evangelizing and pushing trace across hadoop components; the more components
instrumented, the more we all will benefit.
Thanks.
> 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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