That is correct. In fact I think the scenario is very general as long as we want Zeppelin to be scalable. Unifying storage is not going to be that useful without supporting updating single record. Without that multiple Zeppelin instances working in parallel would not be viable.
From: Jeff Zhang <zjf...@gmail.com> Reply-To: "users@zeppelin.apache.org" <users@zeppelin.apache.org> Date: Tuesday, October 17, 2017 at 1:07 AM To: "users@zeppelin.apache.org" <users@zeppelin.apache.org> Subject: Re: notebook-authorization.json file makes Zeppelin not scalable Unify storage could be done in 0.8.0. But for your scenario, it's not about storage, it's about how to update the storage. For now, for each change, the whole file needs to be updated. You scenario means each change only update one record. Tan, Jialiang <j...@ea.com<mailto:j...@ea.com>>于2017年10月17日周二 下午3:47写道： I went through those tickets. Are there any plans on those improvements? When will the storage layer unification be done approximately? From: Jeff Zhang <zjf...@gmail.com<mailto:zjf...@gmail.com>> Reply-To: "users@zeppelin.apache.org<mailto:users@zeppelin.apache.org>" <users@zeppelin.apache.org<mailto:users@zeppelin.apache.org>> Date: Tuesday, October 17, 2017 at 12:45 AM To: "users@zeppelin.apache.org<mailto:users@zeppelin.apache.org>" <users@zeppelin.apache.org<mailto:users@zeppelin.apache.org>> Subject: Re: notebook-authorization.json file makes Zeppelin not scalable Still in file format. Tan, Jialiang <j...@ea.com<mailto:j...@ea.com>>于2017年10月17日周二 下午3:38写道： Thanks for such quick reply. Does Zepplin 0.8.0-SNAPSHOT MONGO DB store autorizations in db or still in that json file? From: Jeff Zhang <zjf...@gmail.com<mailto:zjf...@gmail.com>> Reply-To: "users@zeppelin.apache.org<mailto:users@zeppelin.apache.org>" <users@zeppelin.apache.org<mailto:users@zeppelin.apache.org>> Date: Tuesday, October 17, 2017 at 12:28 AM To: "users@zeppelin.apache.org<mailto:users@zeppelin.apache.org>" <users@zeppelin.apache.org<mailto:users@zeppelin.apache.org>> Subject: Re: notebook-authorization.json file makes Zeppelin not scalable There's one ticket for unifying zeppelin storage layer. https://issues.apache.org/jira/browse/ZEPPELIN-2742 But for your case about sharing notebook-authorization across multiple zeppelin instances, I think this ticket is not enough, it would require more deep integration with shiro's authorization. Tan, Jialiang <j...@ea.com<mailto:j...@ea.com>>于2017年10月17日周二 下午3:14写道： We want to have a Zeppelin service that serves over 200 people in our company. So we plan to have around 10 – 15 Zeppelin instances behind an ELB. We use S3 as notebook storage, and hence all our Zeppelin instances are referring to the same S3 location for notebooks. But there is one thing that breaks the whole thing: Zeppelin is storing the notebook authorization information into a LOCAL file called notebook-authorization.json. In order to solve the problem we setup some NFS like thing to let every Zeppelin instance to refer to the same configuration location through FS mount. The method has following problems: 1. We cannot handle concurrency conditions where multiple Zeppelin instances are editing the files at the same time. Some unexpected behaviors will happen. 2. I found out that Zeppelin only reads the notebook-authorization.json file to memory on startup. After startup, it only treats the authorization in memory as the source of truth. Zeppelin will never read that file anymore unless you restart it. It only writes to it, from memory. Therefore even without the concurrency problem described in (1), it is not able to get the correct authorization for notebooks after other Zeppelin instances change the authorization file. I know the reasons behind for making authorizations separate from notebook but it actually brings up more serious problems like this. Any ideas how to tackle this problem and make Zeppelin scalable?
