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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-4171) Update to htrace-core4
Date Thu, 07 Jul 2016 04:54:10 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15365608#comment-15365608
] 

Christopher Tubbs commented on ACCUMULO-4171:
---------------------------------------------

Of the options, I think it'd be better to bump our version with Hadoop updates. But, I think
that by doing so, we should also bump our Hadoop version, and recommend newer Hadoop for newer
Accumulo versions. That'd be a short-term thing. Long-term, I think we really do want to convince
Hadoop to be more careful about bumping their dependencies when the dependencies aren't compatible...
and I think we want to try to convince the HTrace community to at least have some strong API
guarantees, like Semver. I think both of those things will not only help us, but will help
their larger communities of users as well.

And, of those two long-term actions, I think convincing HTrace to adopt Semver or some other
strong API guarantees, is most important... in particular because Hadoop has already suffered
from using really old dependencies, and I wouldn't want to encourage them to be even more
reluctant to bump them.

> Update to htrace-core4
> ----------------------
>
>                 Key: ACCUMULO-4171
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4171
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: trace
>            Reporter: Mike Drob
>             Fix For: 1.9.0
>
>
> We are currently using HTrace 3.1.0-incubating. There were some API changes and improvements
on the way to HTrace 4.x-incubating, and we should stay up to date with those changes.
> Currently you can extend Accumulo tracing down into HDFS if you're using Accumulo 1.7
and Hadoop 2.7. This ticket is for continuing to make that work for versions of Hadoop >
2.7.



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