jcoffey-dev is traveling from Thursday 1 October through Sunday 4 October. Issues and pull requests are welcome, and will get an answer after that. Thanks for your patience.
IMAP import wrote a whole folder in one transaction and stopped the folder
at the first message it could not import. A crash near the end of a large
INBOX kept nothing, and one bad INTERNALDATE lost the rest of the folder.
Worse, when a folder stopped early, fetches still in flight for it could be
filed into the next folder's mailbox.
- The transaction is committed after every fetch chunk. Each message is
written in its own savepoint, so what is committed is always whole, and a
rerun fetches only the UIDs still missing.
- A message that cannot be imported is rolled back on its own, logged with
its folder and UID, and counted as failed; the folder carries on, and the
message stays out of the UID map so the next run tries it again. Archive
and I/O errors still stop the run.
- Fetch jobs and events carry a folder generation. Moving to a new folder
cancels queued work for older ones, and any event from an older
generation is dropped, never filed. Shutdown drains in-flight events
before joining the workers, so it cannot hang on a blocked worker.
- INTERNALDATE month names are matched in any case.
- Maildir import gets the same per-message savepoint, and commits every 500
new messages instead of once per folder.
jcoffey-dev