Re: fts-flatcurve 2.4.4: after "doveadm fts optimize" a mailbox stops indexing new mail (empty current.<id> shard, missing iamglass)

> On 08/07/2026 10:22 AM MDT Ihor Rusyn via dovecot <[email protected]> wrote:
>
> Hello,
> 
> "doveadm fts optimize" leaves the mailbox in a state where no new mail can
> be
> indexed. The existing index survives and searches over already-indexed mail
> keep
> working, so the damage is invisible until the next message arrives.
> 
> Version:      2.4.4 (8b687aa65c), packaged in a container image
> FTS:          fts_flatcurve, substring_search = yes, min_term_size default
> (2)
>               fts_autoindex = yes, fts_search_add_missing = yes
> Index store:  NFSv3 (rsize/wsize 32768, local_lock=none)
> Mail store:   NFSv3, maildir

[snip]

I cannot reproduce this, probably due to some combination of NFS latency and semantics.  (Xapian itself notes that NFS operation can be problematic. https://xapian.org/docs/admin_notes.html)

It's likely fixed by adding fts_flatcurve_xapian_refresh() in  fts_flatcurve_xapian_optimize_box_do(), but I am unable to verify.

michael

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