Hi everyone, Yet another following up on our recent Postgres work.
In the last sprint, our team successfully migrated the mailbox core module `apache-james-mailbox-postgres` fully from JPA to Postgres. We did some performance tests with the IMAP server backed by Postgres-app and the result was very impressive: postgres-app outperformed JPA about 20 times (at least look at the 99 percentile) with even less resource usage (CPU and memory) compared to the jpa-app. For more details: https://github.com/linagora/james-project/issues/4936 We are working on an ADR to explain our schema decision on the core tables like mailbox and message tables, and also solving the flags concurrently update issue. In the coming time, we plan to: - Migrate other remaining minor components from JPA code to Postgres. - Plug the RabbitMQ, S3, OpenSearch into the Postgres-app. On that, we would try to implement alternative implementations with Postgres e.g. BlobStore backed by Postgres. We would provide configurable module choosers so users are free to choose the implementation. Best regards, Quan Vào Th 2, 27 thg 11, 2023 vào lúc 19:55 Benoit TELLIER < btell...@apache.org> đã viết: > Thanks for the write up Quan! > > I would add that we shall rights ADRs about important decisions on the > PostgreSQL implementation. > > So far I identified... > > - table structure for the postgresql mailbox > - how deletes are handled > - concurrency control for flag updates > > Those ADR would be opened on the postgresql branch and eventually make > it to the James master branch. > > Best regards, > > Benoit TELLIER > > On 27/11/2023 12:47, Quan tran hong wrote: > > Hi everyone, > > > > This is a follow-up on the Postgres implementation topic. We have been > > working on this topic for a while and your feedback and expertise about > > Postgres would be helpful :-) > > > > For short: > > - On the progress: We have implemented the SubscriptionMapper, > > UsersRepository, DomainList, and MailboxMapper. We are working on > replacing > > MessageMapper (a big one) and other components. We planned to have a > > fully functional Postgres mailbox before moving to other blocks like > object > > storage, search, JMAP support... Of course, we are hungry to have a > > performance test for the Postgres mailbox, but it is too early ATM while > > the core components are not ready. > > - We use jOOQ library + r2dbc-postgresql so far, and the development > > experience is overall good. The jOOQ documentation and examples are not > > always ready TBH, but by doing a bit of research and ChatGPT, we managed > to > > get jOOQ work so far. > > - Sometimes Guice binding for Postgres code is not easy because we are > > mixing up the JPA and Postgres code for now, which leads to some > dependent > > issues. > > > > So far developing James, at least for me, I experienced mostly NoSQL and > > not SQL. So your SQL expertise would definitely help us with its best > > practices. > > For more details on what we did and plan to do on the Postgres topic, you > > can kindly review them at: > > > https://github.com/linagora/james-project/issues?q=is%3Aopen+is%3Aissue+label%3APostgresql > > > > Best regards, > > > > Quan > > > > > > Vào Th 6, 13 thg 10, 2023 vào lúc 16:32 Matthieu Baechler < > > matth...@baechler-craftsmanship.fr> đã viết: > > > >> Hi Benoit, > >> > >> This topic has been discussed for years, I'm happy you finally draw a > plan > >> for it. > >> > >> To me, the aim for Postgres is small to middle size deployment with > >> minimal dependencies. > >> > >> In that regard, having an implementation that spans across all > >> infrastructure needs is a must have. > >> > >> So my take would be let's implement everything with PG: blob storage, > >> search, messaging and various data storage like Event Sourcing and plain > >> data. > >> > >> For a user, it will always be possible to plug another piece of > >> infrastructure if need be (like having better search or store more > blobs, > >> etc). > >> > >> The only nice-to-have to me would be the multi-tenant goal as you can > >> always spawn another James instance by domain (and you can use the same > PG > >> if you want by using several databases). > >> > >> To answer the last questions: I would definitely be interested in using > >> this implementation (I use JPA for now). I could marginally contribute > to > >> it as I have experience with PG but my time is very limited (unless > someone > >> wants to sponsor my work, of course). I can donate some code related to > >> Event Sourcing has I have an implementation of an Event Store on top of > PG > >> and some code around messaging. Let me know if you are interested in > that > >> contributation. > >> > >> In term of strategy, I think that would help James gain popularity among > >> hobbyist and small businesses, so I think it worth trying. > >> > >> Cheers, > >> > >> -- Matthieu Baechler > >> > >> ------- Original Message ------- > >> On Friday, October 6th, 2023 at 23:48, Benoit TELLIER < > >> btell...@linagora.com> wrote: > >> > >> > >>> > >>> Hey there! > >>> > >>> The goal: deliver James "stateless email server" concept to smaller > >> deployments than those addressable with the Distributed server. > >>> Why Postgres? Rock solid. And more options than other SQL stores (see > >> below) > >>> The requirements would be: > >>> - Leverage the blobStore for binary storage (email bodies + > >> attachements). Those big binaries are not meant to be stored into SQL > rows > >> - blaming you, JPA! > >>> - Bring choice on blob store : PGSQL native solution ( > >> https://www.postgresql.org/docs/7.4/jdbc-binary-data.html ) for small > >> deployments OR S3 > >>> - Bring choice on search: PGSQL native solution ( > >> https://www.postgresql.org/docs/current/textsearch.html ) for small > >> deployments OR OpenSearch > >>> - Bring choice on PubSub: PGSQL native solution ( > >> https://www.postgresql.org/docs/current/plpgsql-trigger.html ) OR > RabbitMQ > >>> - Enforce strict tenant isolation: domain A won't access domain B data > >> even if we screw up James access control layer. This can be done with > Row > >> security https://www.postgresql.org/docs/current/ddl-rowsecurity.html . > >>> - Be reactive. This can be achieved by using a reactive firendly driver > >> like r2dbc... > >>> - Ensure that we can easily run on some largely scaling postgres... > >> CitusData ? > >>> An other outcome might be to drop JPA implementation, ideally... (we > >> provide something similar but waaaay better) > >>> Ideally I would like to deliver this before september 2024... > >>> > >>> Thoughts? > >>> Would this be something interesting people in here? > >>> Would some people be interested contributing to this effort? > >>> Would some people desire sponsoring this effort? > >>> > >>> If this is non consensual, I can also contribute this into > >> https://github.com/linagora/tmail-backend/ without annoying people in > >> here... > >>> > >>> > >>> -- > >>> > >>> Best regards, > >>> > >>> Benoit TELLIER > >>> > >>> General manager of Linagora VIETNAM. > >>> Product owner for Team-Mail product. > >>> Chairman of the Apache James project. > >>> > >>> Mail: btell...@linagora.com > >>> Tel: (0033) 6 77 26 04 58 (WhatsApp, Signal) > >>> > >>> > >> > >> > >> --------------------------------------------------------------------- > >> To unsubscribe, e-mail: server-dev-unsubscr...@james.apache.org > >> For additional commands, e-mail: server-dev-h...@james.apache.org > >> > >> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: server-dev-unsubscr...@james.apache.org > For additional commands, e-mail: server-dev-h...@james.apache.org > >
