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https://issues.apache.org/jira/browse/JAMES-2919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gautier DI FOLCO updated JAMES-2919:
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    Attachment: adr-0002-precompute-jmap-preview.md
                adr-0001-jmap-partial-reads.md

> Allow partial message read in JMAP DRAFT
> ----------------------------------------
>
>                 Key: JAMES-2919
>                 URL: https://issues.apache.org/jira/browse/JAMES-2919
>             Project: James Server
>          Issue Type: Wish
>          Components: JMAP
>            Reporter: Benoit Tellier
>            Assignee: Antoine Duprat
>            Priority: Major
>         Attachments: adr-0001-jmap-partial-reads.md, 
> adr-0001-jmap-partial-reads.md, adr-0002-precompute-jmap-preview.md, 
> adr-0002-precompute-jmap-preview.md
>
>
> Please find attached the two technical decisions being proposed.
> h1. Objectives:
>  - Reduce the pressure exerced by JMAP on underlying data stores
>  - Improve network usage between James & JMAP client
> h2. Proposal for JMAP partial reads
> Introduce two projections for JMAP messages:
>  - One with only metadata
>  - One with metadata + headers
> Given the properties requested by the client, the most appropriate message 
> projection will be returned.
> Finally, we should nullify JSON fields not requested by the client before 
> sending it to the client.
> h2. Proposal for JMAP preview computation
> We should pre-compute message preview.
> A MailboxListener will compute the preview and store it in a 
> MessagePreviewStore.
> We should have a Cassandra and memory implementation.
> When the preview is precomputed then for these messages we can consider the 
> "preview" property as a metadata.
> We should provide a webAdmin task allowing to rebuild the projection.



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