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From "Ben Sigelman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15566) Remove HTrace support
Date Sat, 07 Jul 2018 16:35:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16535828#comment-16535828

Ben Sigelman commented on HADOOP-15566:

[~stevel@apache.org] I agree that a new field (for the tracing context) makes the most sense
from a compatibility standpoint.

[~jojochuang]: are there specific blockers or questions you have about the OT port? If so,
let me know and I'll do my best to address/answer them. I'm also happy to help with the mechanics
of the change (or find someone with more cycles in the OT community to do the same). This
can be a really positive thing for HDFS, HBase, etc, as the traces within the datastore/filesystem
can be connected to the traces in the application above, regardless of the particular tracing
system in use. (I know that at google, it was valuable for both the bigtable core team and
for bigtable users to see traces that wend their way from app code into bigtable and back,
esp for slow / poorly-constructed queries).


> 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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