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https://issues.apache.org/jira/browse/HADOOP-15566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16561322#comment-16561322
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mck commented on HADOOP-15566:
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bq. Thats this stuff:
https://github.com/apache/cassandra/tree/trunk/src/java/org/apache/cassandra/tracing
?
That's correct. It's a bit different i'm presuming for the hadoop ecosphere as
its tracing api is htrace.
So I'm speaking off-the-cuff but I wonder if it's would be worth evaluating
writing a htrace-api->opentracing-java or htace-api->census or
htrace-api->zipkin (as many backends now accept zipkin traces, in fact more
than opentracing last time i checked, so zipkin might well be considered thee
de facto standard atm) layer. But of these could form a template to help others
to write htrace->xyz plugins. While htrace may be disappearing, maintaining
just its api in this form for plugin, may not be a big deal, and provides
end-to-end tracing in many *existing* hadoop ecosystems.
bq. Could try re-emitting existing (h)traces to zipkin – it used to work – or
whatever sink.
Yup, that's what I was trying to explain above. But as a plugin. Folk will
appreciate that they only need to instrument one api rather than a whole
ecosystem again. And I wouldn't be comfortable betting on one abstraction layer
over another, not right now.
> 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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