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https://issues.apache.org/jira/browse/HADOOP-15566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16831360#comment-16831360
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Wei-Chiu Chuang commented on HADOOP-15566:
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I spent past few months thinking about the ways to add opentracing.
[~carlosalberto] and my PoC are ok (for the record, here's what [~fabbri],
[~rizaon] and I did before
https://github.com/jojochuang/hadoop-common/commits/hac-271), but the problems
are (1) the work were not backward compatible (2) the change were too much,
hard to review.
[~smeng] is working on a patch to approach this, with minimal code change as
possible. I will post a design doc soon.
Recently, while I worked on KMS-o-meter tool, a workload replay tool for KMS, I
added opentracing in it and in KMS server/client.(courtesy of [~elek]'s tracing
work in ozone, I simply took part of it). The ability to understand system
performance in such details is unprecedented. We were able to fix a system
scalability bug, verify it in record time. Will file a jira and contribute the
opentracing code in KMS server/client back to the community.
> Support Opentracing
> -------------------
>
> Key: HADOOP-15566
> URL: https://issues.apache.org/jira/browse/HADOOP-15566
> Project: Hadoop Common
> Issue Type: New Feature
> 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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