Hi! It sounds like you want to write data to BigQuery and then load the same data back from BigQuery? Why? I'm particularly confused by your comment "nothing left in the PCollection" - writing a collection to BigQuery doesn't remove data from the collection, a PCollection is just a logical description of a dataset, not a mutable container. Transforms are like mathematical functions - they don't change their inputs, they only compute their outputs.
Perhaps that you're assuming that Beam pipelines can only be a strict linear sequence of transforms? That is not the case - pipelines are an arbitrary graph, you can use a collection multiple times, i.e. apply multiple transforms to it. E.g. you can both write the collection to bigquery (step 3) and apply some other transform to the same collection (step 5). Assuming you use Java: PCollection<Foo> foos = p.apply(TextIO.read().from(...)).apply(...some transform...); foos.apply(BigQueryIO.write().to(...)); PCollection<Bar> bars = foos.apply(...some other transform...); bars.apply(BigQueryIO.write().to(...)); Let me know if this helps. On Sat, Jun 10, 2017 at 3:42 PM Morand, Sebastien < [email protected]> wrote: > Hi, > > Is there any way to add some step after a Write, because Write return un > PDone, so I can't do anything, but I would like actually do something. > > Example : > > 1. Load data from gcs > 2. Some transform > 3. Write data into bigquery > => Nothing left in the pcollection, but when 3 is over => > 4. Load data from bigquery > 5. Some other transform > 6. Write data into bigquery > > Any way to do that? > > Thanks, > > *Sébastien MORAND* > Team Lead Solution Architect > Technology & Operations / Digital Factory > Veolia - Group Information Systems & Technology (IS&T) > Cell.: +33 7 52 66 20 81 / Direct: +33 1 85 57 71 08 > <+33%201%2085%2057%2071%2008> > Bureau 0144C (Ouest) > 30, rue Madeleine-Vionnet - 93300 Aubervilliers, France > *www.veolia.com <http://www.veolia.com>* > <http://www.veolia.com> > <https://www.facebook.com/veoliaenvironment/> > <https://www.youtube.com/user/veoliaenvironnement> > <https://www.linkedin.com/company/veolia-environnement> > <https://twitter.com/veolia> > > > > -------------------------------------------------------------------------------------------- > This e-mail transmission (message and any attached files) may contain > information that is proprietary, privileged and/or confidential to Veolia > Environnement and/or its affiliates and is intended exclusively for the > person(s) to whom it is addressed. If you are not the intended recipient, > please notify the sender by return e-mail and delete all copies of this > e-mail, including all attachments. Unless expressly authorized, any use, > disclosure, publication, retransmission or dissemination of this e-mail > and/or of its attachments is strictly prohibited. > > Ce message electronique et ses fichiers attaches sont strictement > confidentiels et peuvent contenir des elements dont Veolia Environnement > et/ou l'une de ses entites affiliees sont proprietaires. Ils sont donc > destines a l'usage de leurs seuls destinataires. Si vous avez recu ce > message par erreur, merci de le retourner a son emetteur et de le detruire > ainsi que toutes les pieces attachees. L'utilisation, la divulgation, la > publication, la distribution, ou la reproduction non expressement > autorisees de ce message et de ses pieces attachees sont interdites. > > -------------------------------------------------------------------------------------------- >
