Align nuxeo-replication for 10.10 and master

Context

Nuxeo Replication was initially coded and released against 9.10:

• package is here
• code is here and package is here
• doc is available in here

The goal is to align this addon on recent versions of the platform.

Addon Alignment

There are different aspects and scope of alignment.

Code Alignment

The nuxeo-replication code needs to be aligned both on 10.10 and on master.

Leverage nuxeo-stream improvements

We have done several improvements inside nuxeo-stream, for example in terms of error handling and retry policy: it would make sense to leverage this in the context of the replication addon.

Remove Blob Replication

The replication initially contains 3 aspects: Repository Documents, Elasticsearch and Blob.

The Blob part should probably never have been done so we should remove this code.

Deeper code integration

nuxeo-replication was built as a pure addon and as is it relies only on existing interfaces and pluggability points:

• listen directly to changes at the MongoDB level
• intercepts (wraps) ES client calls to gather commands

We will need to do the same for 10.10, however, on master, we may want to go futher:

• have an explicit API to listen or replay repository changeset
• rely on native nuxeo-stream support for indexing rather than intercepting calls

CI and Testing

Here again, we can isolate different scopes.

Build and Unit tests

nuxeo-replication addons needs to be built and tested by maintained pipeline.

End to End Testing

The end-to-end testing that was done on OCP against 9.10 should ideally be done on K8S with a fully automated pipeline.

HA testing for Nuxeo

Part of the end-to-end testing involves killing Nuxeo nodes and verify that the Nuxeo Cluster still works.
These tests could be interesting for nuxeo platform even outside of the nuxeo-replication scope.