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https://issues.apache.org/jira/browse/JAMES-3979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17813200#comment-17813200
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Zhivko Vasilev commented on JAMES-3979:
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This doesn't look right to me.

This violates what RFC says
https://datatracker.ietf.org/doc/html/rfc8620
state: "String"
If the data changes, this string MUST change. If the Foo data is unchanged, 
servers SHOULD return the same state string on subsequent requests for this 
data type.

I've added a retry mechanism, but even with 20 iterations of 250 milliseconds 
each, it sometimes fails. This makes integration tests very unstable.

I have not taken a look at how JAMES implements this. However, several years 
ago, I had to implement similar logic with Cassandra. One additional table with 
TTL.

timed-uuid/mailbox-uuid/folder-uuid/msg-uuid or
mailbox-uuid/timed-uuid/folder-uuid/msg-uuid
I do not remember the details, but it was something like that, where 
mailbox-uuid/timed-uuid had the role of the state. 
Each mutation just added an entry in that table with a lightweight transaction.

But it is up to you , I'll stick with what works :)

> "Email/import" doesn't change the state
> ---------------------------------------
>
>                 Key: JAMES-3979
>                 URL: https://issues.apache.org/jira/browse/JAMES-3979
>             Project: James Server
>          Issue Type: Bug
>          Components: JMAP
>            Reporter: Zhivko Vasilev
>            Assignee: Antoine Duprat
>            Priority: Minor
>         Attachments: james_email_import_response.json
>
>
> I have created an automated test in which two app instances run on one 
> account. In this test, app1 imports emails into different folders or changes 
> email properties (read/unread/etc.), and the other app syncs and checks that 
> they are okay.
> However, it seems that "Email/import" doesn't change the state. As a result, 
> the sync from the other app instance cannot detect the changes.



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