Multi tenant event tracking/replay

Raoul · October 19, 2022, 5:11am

Hi,

I’ve been playing around with the different event tracking processors and some questions regarding best practices for multi tenant support for event tracking and replaying.

I’ve read through some of the existing questions in regards to this but I am still a bit confused as the best way to implement it ( Multitenant tracking event processor based on Hibernate multitenancy support & Multi tenancy event processors)

From everything I’ve read it looks like using Tracking instead of Subscribing is the way to go and I’ve implemented a basic event tracking, replaying and up casting into our current application but the tracking tokens seem to be universal with no clear way of separating them.

Would it be possible to have tracking tokens split between the different tenants so when I go to reset tokens I could specify which tenant i would like to replay, it would also help the situation to not have a tenants data replayed if they want their data scrubbed but us still needing to keep axon events as a auditing trail.

We are currently using the EventHandlerInterceptor to set a ThreadLocal tenant id that is stored in the event payload which we then use to specify which mongo collection to save data into. Could I hook something into that?

Thanks

stefand · October 19, 2022, 5:45am

If you would use multi tenant extension this would be possible, check following example:

github.com

AxonIQ/code-samples/blob/master/multitenant-application/src/main/java/io/axoniq/multitenancy/web/ResetService.java

/*
 * Copyright (c) 2020-2020. AxonIQ
 *
 * Licensed under the Apache License, Version 2.0 (the &quot;License&quot;)
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an &quot;AS IS&quot; BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package io.axoniq.multitenancy.web;

import io.axoniq.axonserver.connector.AxonServerConnection;
import io.axoniq.axonserver.grpc.admin.CreateContextRequest;
import org.axonframework.axonserver.connector.AxonServerConnectionManager;

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Raoul · October 19, 2022, 5:51am

Thanks I’ll have a look into it, I have no idea how I’ve completely missed the multi tenant extension.

stefand · October 19, 2022, 5:53am

It was released recently, not blaming you

Raoul · October 19, 2022, 7:33am

Thats good to know, I thought my googling skills were declining

stefand · October 19, 2022, 8:45am

This Extension is only for Axon Framework <> Axon Server. But if you are not using Axon Server, you should disable MultiTenancyAxonServerAutoConfiguration auto-configuration and implement the same factory beans from this class with equivalents using desired technology

Raoul · October 20, 2022, 6:16am

Thanks, yeah we are using Axon Framework and Server together so this is looking really good so far.

Raoul · October 20, 2022, 8:31am

Should the multitenant extension work with Axon Server SE?
Some of the documentation have Axon Server EE as a requirement while some just have Axon Server 4.6+ as a requirement.

I’ve setup a test environment and while its not straight out throwing an error about not having EE I’m getting io.grpc.StatusRuntimeException: UNIMPLEMENTED: Method not found: io.axoniq.axonserver.grpc.admin.ContextAdminService/GetContexts but GetContexts doesn’t look like a specific EE method to me.

stefand · October 20, 2022, 1:50pm

It’s only for Axon Server Enterprise (supports multiple contexts), as the Standard edition supports only a single context, therefor can’t use context per tenant approach.

You may read more in the blog. But you are right, it does not mention the Enterprise version which is a mistake.

If you are interested I can provide you a trial Enterprise license to test the multitenancy app.

Raoul · October 20, 2022, 2:11pm

That makes a lot of sense, thanks for clearing that up for me.

I would really appreciate a trial licence in order to test it out. What do you need from me?