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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15566) Remove HTrace support
Date Fri, 06 Jul 2018 09:46:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16534634#comment-16534634
] 

Steve Loughran commented on HADOOP-15566:
-----------------------------------------

Nice screenshots

* The HDFS team need to be involved in all discussions w.r.t tracing and wire protocols; I
see Anu is watching; [~jnp] should keep an eye on it too
* And hbase, eg @stack.

I don't see the existing field being reusable unless there's no risk that an htrace client
-> opentrace server or opentrace client to htrace-enabled server isn't going to do bad
things. Even if we don't know of anything in production, it's part of our [compatibility definition|http://hadoop.apache.org/docs/r3.0.3/hadoop-project-dist/hadoop-common/Compatibility.html#Wire_Protocols].
Making it a new optional field & ignoring the htrace one is the safe route.

> 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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