[Akonadi] [Bug 502560] [Office365][Imap][akonadi] failure to sync/pull all messages from an Inbox with 10GB of e-mails. (infinite loop)

[Daniel Vrátil]

https://bugs.kde.org/show_bug.cgi?id=502560

Daniel Vrátil <dvratil at kde.org> changed:

           What    |Removed                     |Added
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     Ever confirmed|0                           |1
             Status|REPORTED                    |CONFIRMED
                 CC|                            |dvratil at kde.org

--- Comment #1 from Daniel Vrátil <dvratil at kde.org> ---
It's not really a loop.  In the past we had problems with GMail having really
broken support for RFC4551/CONDSTORE extension
(https://datatracker.ietf.org/doc/html/rfc4551), which allows us to ask the
email server to give us all messages that have changed since the last time we
checked. Without CONDSTORE, we are able to easily find new messages, but to
check a flag change of an existing message (e.g. if you marked some older
message as read/unread), we need to list *all* messages in the mailbox and
compare their flags with what we have cached in Akonadi. If a massive mailbox,
this takes ages....

There are two steps that we should take:
1) Check whether GMail have fixed their CONDSTORE support and re-enable it.
This would fix the problem instantly for you.
2) Get rid of the SEARCH - it was an optimization to ensure that we always get
a batch of 2000 valid UIDs. Unfortunately on most IMAP servers (incl. Gmail),
SEARCH takes ages. We can still do batching for the search, if we do a regular
FETCH instead of UID FETCH, and have UIDs included in the response. We can
possibly even increase the batch size if we process things more efficiently.
That should be much much much faster. Even if CONDSTORE is still broken on
Gmail, this should speed up the sync massively.

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