Doc update to indicate HTrace is unfinished is fine. Phoenix uses HTrace to support query tracing. It "works". 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. 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. 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. On Tue, Aug 15, 2017 at 12:10 PM, Stack <[email protected]> wrote: > On Tue, Aug 15, 2017 at 11:22 AM, Andrew Purtell <[email protected]> > wrote: > > > -1 to removing HTrace from HBase. > > > > Upgrade to the desired version, that would be fine. > > > > > âtâ > > What you thinking Andrew? > > Trace is broke whether we upgrade or not. As is, we mislead. We give off > 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 <[email protected]> > 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 and > 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 want 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
