When the search plugin is enabled, with the options:

# search plugin
# path to the omega cgi program
omega_cgi: /usr/lib/cgi-bin/omega/omega
# use google site search rather than internal xapian index?
google_search: 0

Then we see the following error when editing a page from the web browser UI or running ikiwiki --rebuild:

Error: Exception: Db block overwritten - are there multiple writers?

The issue goes away when we disable the 'search' plugin.

We're running ikiwiki version 3.20180228-1.

Every time? I used to see an error (this one, I think) intermittently on OS X, on incremental rebuilds only. Haven't seen it in a while, though. Maybe something got fixed upstream. What OS, and what version of Xapian and Omega? (1.4.11 for me.) Maybe worth blowing away .ikiwiki/xapian/, as described in inside dot ikiwiki?


We've removed the .ikiwiki/xapian directory before performing a rebuild, including actually rebooting the host OS. The search appears to work for a while, but once the wiki has been live for a while (and subject to edits on the web interface), the issue reappears.

  • OS: Ubuntu 18.04.2 LTS (GNU/Linux 4.15.0-47-generic x86_64)
  • xapian-tools/bionic-updates,bionic-security,now 1.4.5-1ubuntu0.1 amd64
  • xapian-omega/bionic,now 1.4.5-1 amd64

I've upgraded our installations of both Xapian components and will let you know if that fixes it. -- jsewell

Updating appeared to fix it. Sorry for not trying that sooner. Thanks for the help. -- jsewell