[FTS Xapian] Status & Questions

[Joan Moreau]

STATUS 

- Alpha code is written and compiling now. (attached) 

- I would like to start testing. However, there is an error when
starting dovecot (git) : 

 Error: Couldn't load required plugin
/usr/lib/dovecot/lib21_fts_xapian_plugin.so: dlopen() failed:
/usr/lib/dovecot/lib21_fts_xapian_plugin.so: undefined symbol:
_Z30fts_backend_default_can_lookupP11fts_backendPK15mail_search_arg 

ldd shows that  fts lib is properly linked: 
# ldd /usr/lib/dovecot/lib21_fts_xapian_plugin.so 
(...) 
lib20_fts_plugin.so => /usr/lib/dovecot/lib20_fts_plugin.so
(0x00007f25f75e0000)
(...) 
libxapian.so.30 => /usr/lib/libxapian.so.30 (0x00007fe3a51e2000) 

Your help very welcome 

PENDING QUESTIONS 

1 - WHat does represent "subargs" in mail_search_args 

2 - for rescan : who is responsible for passing again the new email ? Is

the Dovecot core sending again all the emails to index ? or the fts 
shall somehow access the mailbox and read all emails ? Wouldn't just be 
saying "delete all index and get_last_uid is now 0" the easy way ? or 
the fts must process all emails (and block the current thread as a 
mailbx maybe quite large) 

3 - for get_last_uid : this uncertainity is very unclear. "If there is a

gap, then indexer first indexes all the missing" -> this mean at a 
certain point, indexer maybe rebuilding a previous email, so *last* uid 
is something different than max. And how indexer does know whther there 
is a gap wihtout callong the fts backend (whch it does not as there are 
no function for that) ? 

Thank you
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