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From: Stack <stack@duboce.net>
Date: Tue, 15 Aug 2017 14:28:31 -0700
Message-ID: <CADcMMgGDgOzRUEFFrCKsqzMrZzSjPmf9Mt87PUXHO=ZNErNUBA@mail.gmail.com>
Subject: Re: [DISCUSS] Remove HTrace 3.2.0-incubating from HBase
To: HBase Dev List <dev@hbase.apache.org>
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archived-at: Tue, 15 Aug 2017 21:28:45 -0000

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On Tue, Aug 15, 2017 at 12:38 PM, Andrew Purtell <apurtell@apache.org>
wrote:

> Doc update to indicate HTrace is unfinished is fine.
>
>
We could do this. Update jar and doc it as broke.


> Phoenix uses HTrace to support query tracing. It "works".


Nit: I didn't think this was htrace. It was an old version pulled into
phoenix world where it lives storing to phoenix table reporting on
phoenix-only spans.


> A colleague made
> a contribution to HDFS to fix a case where spans could get muddied around
> the WAL. We are carrying that patch on top of 2.7 for the moment but IIRC
> it's in 2.8.
>
> Removing all of our HBase level spans doesn't make sense to me when spans
> at HDFS level will not be removed, nor at the Phoenix level.


The spans in hbase are just hanging until they get the htrace-4 revamp and
the dots get connected.


> We hollow out
> the middle. I think this is worse than leaving things at a half finished
> state. At least in the half finished state it might get finished.
>
>
Nod.


> What are the most pressing issues? I'm up for supporting an "HTrace" get
> well. I'll need your (community) help for getting patches into Hadoop if
> need be.
>
>
HTrace needs care and a viewer (zipkin I think now it has come back alive).

HBase needs a couple of narratives wired through.

Ditto HDFS.

St.Ack


>
> On Tue, Aug 15, 2017 at 12:10 PM, Stack <stack@duboce.net> wrote:
>
> > On Tue, Aug 15, 2017 at 11:22 AM, Andrew Purtell <apurtell@apache.org>
> > wrote:
> >
> > > -1 to removing HTrace from HBase.
> > >
> > > Upgrade to the desired version, that would be fine.
> > >
> > >
> > =E2=80=8Bt=E2=80=8B
> >
> > What you thinking Andrew?
> >
> > Trace is broke whether we upgrade or not. As is, we mislead. We give of=
f
> > the impression that hooking up hbase and hdfs via trace tells a story
> about
> > request traversals when it at best you'd get a wonky view.
> >
> > HTrace needs work. HBase and HDFS also need work before we can suggest =
to
> > our users this system is viable debugging.
> >
> > What you reckon Andrew?
> > Thanks,
> > S
> >
> >
> >
> >
> > >
> > > On Tue, Aug 15, 2017 at 5:54 AM, Tamas Penzes <tamaas@cloudera.com>
> > wrote:
> > >
> > > > Hi All,
> > > >
> > > > As far as I know the actual integration of HTrace 3.2 into HBase is
> far
> > > > from satisfying.
> > > >
> > > > This version of the library is old, buggy, not really maintained an=
d
> > the
> > > > migration to version 4.x is quite hard (
> > > > https://issues.apache.org/jira/browse/HBASE-14451) and looks like
> the
> > > task
> > > > is not getting much closer to the goal.
> > > >
> > > > This is why I think we should remove HTrace now and if we still wan=
t
> to
> > > > have some art of tracing (I think it would be useful) then start it
> > from
> > > > the baseline.
> > > > I have created a ticket for this task:
> > > > https://issues.apache.org/jira/browse/HBASE-18601
> > > > The removal could be quite fast and reach version 2.0.0 too.
> > > >
> > > > What do you all think?
> > > >
> > > > Thanks, Tamaas
> > > >
> > >
> > >
> > >
> > > --
> > > Best regards,
> > > Andrew
> > >
> > > Words like orphans lost among the crosstalk, meaning torn from truth'=
s
> > > decrepit hands
> > >    - A23, Crosstalk
> > >
> >
>
>
>
> --
> Best regards,
> Andrew
>
> Words like orphans lost among the crosstalk, meaning torn from truth's
> decrepit hands
>    - A23, Crosstalk
>

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