Noa created UNOMI-345:
-------------------------
Summary: Support Elasticsearch external versioning
Key: UNOMI-345
URL: https://issues.apache.org/jira/browse/UNOMI-345
Project: Apache Unomi
Issue Type: New Feature
Components: core
Reporter: Noa
Since updating events is now possible, there's a need to make sure that an
event won't be updated with it's older version. e.g - when you created an event:
{
"foo": "bar",
"version": 1
}
and then sent an event update:
{
"foo": "baz",
"version": 2
}
You need to make sure that the older version, "bar", is saved *before* the
update, or not saved at all, so eventually the document will contain the "baz".
Currently, there's no way of implementing that in Unomi, but Elasicsearch does
have a solution for that. It's called external versioning. By default,
Elasticsearch uses an internal documents versioning that increments the version
+1 every document update. If you prefer managing your versions on your own,
Elastic allows that by using external versioning -
[https://www.elastic.co/blog/elasticsearch-versioning-support]
External versioning is the solution because Elasticsearch throws an exception
(409) if you try to save a document with an older version then the one that is
currently stored. This way, if we go back to our example, the "baz" will be
saved first and when the "bar" will arrive it will be rejected because it's an
older version.
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