Hi Anthony, Thank you for reporting the issue. It does look like that the exception is coming from greenplum.
A few follow up questions:- 1. Did you compile madlib from source? If yes, which branch? 2. What version of gcc did you use to compile madlib? Please note that madlib does not work with gcc5 and up. 3. Did you run madlib install-check? 4. As Luis mentioned, you may want to try using CentOS 6/7. Thanks, Nikhil Kak On Mon, Dec 4, 2017 at 3:32 PM Luis Macedo <lmac...@pivotal.io> wrote: > Yep... Greenplum had an issue with that job. Maybe you could also post on > GPDB user list. > > Check greenplum.org for the instructions. > > Not sure about running on Ubuntu... Ubuntu support is new so you might > want to try on CentOS if you can. > > Tks > > *Luis Macedo | Sr Platform Architect | **Pivotal Inc * > > *Call Me @ **+55 11 97616-6438 <+55%2011%2097616-6438>* > *Take care of the customers and the rest takes care of itself* > *---* > *Pivotal POV Blog* <https://content.pivotal.io/blog> > > *Pivotal Mission: Help Developers Do What They Love > <https://www.youtube.com/watch?v=xdw_9dADM-4&list=PLAdzTan_eSPQ1fuLSBhyB4eEZF7JQM0Mx>* > *Big Data Problems? Go here!* <https://pivotal.io/pivotal-greenplum> > *Latency Issues? No more! <https://pivotal.io/pivotal-gemfire>* > <https://pivotal.io/pivotal-gemfire> > --- > > > 2017-12-04 15:07 GMT-08:00 Anthony Thomas <ahtho...@eng.ucsd.edu>: > >> Hi MADLib Users, >> >> I'm running MADLib on Greenplum 5.1.0 under Ubuntu 16.04. If I try to run >> the example for KMeanspp given here >> <http://madlib.apache.org/docs/latest/group__grp__kmeans.html>, I get >> the following error message: >> >> NOTICE: Releasing segworker groups to finish aborting the transaction. >> ERROR: could not connect to segment: initialization of segworker group >> failed (cdbgang.c:236) >> CONTEXT: PL/Python function "internal_compute_kmeanspp_seeding" >> SQL statement "SELECT ( SELECT madlib.internal_compute_kmeanspp_seeding( >> '_madlib_kmeanspp_args', '_madlib_kmeanspp_state', textin(regclassout( $1 >> )), $2 ) )" >> PL/pgSQL function "kmeanspp_seeding" line 79 at assignment >> SQL statement "SELECT madlib.kmeans( $1 , $2 , >> madlib.kmeanspp_seeding( $1 , $2 , $3 , $4 , NULL, $5 ), $4 , $6 , >> $7 , $8 )" >> PL/pgSQL function "kmeanspp" line 4 at assignment >> >> I've tried running a few other built-in ML algorithms and they all seem >> to work fine. The error message seems to suggest its a problem with >> Greenplum, but some preliminary Googling has not yielded useful results. Has >> anyone seen this error before or have any ideas about how to diagnose it? >> >> Thanks, >> >> Anthony >> > >
