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https://issues.apache.org/jira/browse/HADOOP-15566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16752975#comment-16752975
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Elek, Marton commented on HADOOP-15566:
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Thanks the idea [~cmccabe]. It's interesting.
Fix me If I am wrong, but as I see the HTrace is not designed to be extensible.
For example the Span is an interface but Tracer always creates the MilliSpan
implementation. To use HTrace as a lightweight layer and support multiple
tracing implementation (such as opentracing or opencensus) we need to refactor
the HTrace code. I have two problems with this approach:
1) The new refactored HTrace won't be compatible the old HTrace. Would be hard
to support old HTrace.
2) It wold be equivalent to resurrect the HTrace which is voted to retire.
(The some thing can be done without importing HTrace code to the Hadoop but
refactor it on the HTrace side)
But it's a valid concern about creating a new layer (even if Cassandra also
followed this approach as @mck wrote it). For me it's hard to compare the
complexity of maintain an own lightweight abstraction layer and maintaining
HTrace. (Even if the first one seems to be easier).
I think the real alternative here is just to use OpenTracing (despite the
concerns about the governance raised by [~michaelsembwever]) And follow the
approach which is prototyped by [~jojochuang], [~fabbri], [~rizaon])
Or (as a first step) it could be added to the existing HTrace code,
side-by-side, to evaluate it.
> 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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