Am 23.09.2019 um 09:36 schrieb Filip Hanes <filip.hanes@ringier.sk>:

št 19. 9. 2019 o 15:30 Fabian via dovecot <dovecot@dovecot.org> napísal(a):

Are there any other hints or tips regarding this „invalid uid ‚0‘"-message?

from fts-solr source:

    case SOLR_XML_CONTENT_STATE_UID:

        if (uint32_parse(str, len, &ctx->uid) < 0 || ctx->uid == 0) {

            i_error("fts_solr: received invalid uid '%s'", t_strndup(str, len));

It means that plugin tries to parse '0' when in state of parsing uid in xml response from solr or there is a bug in xml response parser.

I would enable rawlog_dir in config and look there for unusual response or extra tags near usual uid in xml response. For example:

plugin {
  fts = solr
  fts_solr = url=... rawlog_dir=/var/log/fts-solr/
}