Dear Ratis devs and users, I’m investigating use of Ratis for HA of RDF4J. In particular I’m wondering about implementation patterns/advice on the stream feature. I’ve read e.g., https://blog.cloudera.com/ozone-write-pipeline-v2-with-ratis-streaming/ and I’ve got a small prototype working. But as the javadoc of org.apache.ratis.statemachine.StateMachine.DataApi#link indicates, the stream _may_ not be available.
I understand there might be error cases that need to be handled. But what about when a node is added to a group? In my investigation so far it seems that also in that case the stream is unavailable. I reckon that replication/recovery of such stream needs to be done ‘outside’ of Ratis; is that correct? I didn’t see such facilities in the file store example: https://github.com/apache/ratis/blob/master/ratis-examples/src/main/java/org/apache/ratis/examples/filestore/FileStoreStateMachine.java. I’ve also tried to figure out how Ozone implements this, but this codebase is a bit to big to easily wrap my head around how this would work. I would appreciate any pointers with regards to this matter. Thanks! Frens Jan Award-winning OSINT partner for Law Enforcement and Defence. Frens Jan Rumph Data platform engineering lead phone: site: pgp: +31 50 21 11 622 web-iq.com <https://web-iq.com/> CEE2 A4F1 972E 78C0 F816 86BB D096 18E2 3AC0 16E0 The content of this email is confidential and intended for the recipient(s) specified in this message only. It is strictly forbidden to share any part of this message with any third party, without a written consent of the sender. If you received this message by mistake, please reply to this message and follow with its deletion, so that we can ensure such a mistake does not occur in the future.
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