is there several 0 results in a row as an anomaly. Or really just one?
You could nearly add SolrJ code to rerun 0-result query with full debug on
if it is a rare enough event.
Regards,
Alex
On Fri, Aug 16, 2019, 12:05 PM Brian Lininger, <brian.linin...@veeva.com>
wrote:
> Yeah, I thought of those same problems at first and expected to find
> something but no luck.
> There are no errors in the solr log for the hour before/after the time that
> we saw the issue, the only warnings I see are "PERFORMANCE WARNING:
> Overlapping onDeckSearchers=2" but these are for other Collections.... and
> as I understand it, this is really just a load issue not a potential
> functional issue.
>
> We're getting a valid response sent back from Solr (the search is logged
> with 0 hits) & SolrJ, so it doesn't seem to be a network issue. We're not
> using aliases, but that shouldn't be a problem as updates to aliases are
> atomic as I understand them. GC's also are fine during that period.
>
> It's really weird....
>
> On Fri, Aug 16, 2019 at 3:51 AM Alexandre Rafalovitch <arafa...@gmail.com>
> wrote:
>
> > I would take the server log for those 10 seconds (plus buffer) and really
> > try to see if something happens in that period.
> >
> > I am thinking an unexpected commit, index large, alias switch. That may
> > help you to narrow down the kind of error.
> >
> > Another option is whether you got empty result or a connection error. I
> am
> > thinking firewall that held on but then dropped a connection.
> >
> > Both of these are unlikely but since you seem to be stuck....
> >
> > Regards,
> > Alex
> >
> > On Thu, Aug 15, 2019, 6:02 PM Brian Lininger, <brian.linin...@veeva.com>
> > wrote:
> >
> > > Hi All,
> > > I'm seeing some odd behavior that I'm hoping someone might have
> > encountered
> > > before. We're using Solr 6.6.6 and very infrequently (happened twice
> in
> > > the past year) we're getting 0 hits returned for a query that I know
> > should
> > > have results. We've hit this issue once over the past year in 2
> separate
> > > collections (both with a single shard), each with several million
> > > documents, where a query will return 0 hits. I see a similar query run
> > > 5-10s later and it will get the expected # of hits (~1M hits) so I know
> > > that we haven't reindexed a million docs between the two queries.
> > Besides
> > > that I can see that between the 2 queries we only added 150-200 docs
> > with a
> > > single commit so I don't see how that could affect the results in this
> > > manner.
> > >
> > > We have a moderate indexing load during the time we see this, we seen
> > much
> > > higher indexing loads without issue but it's also not idle either.
> I've
> > > spent a bunch of time trying to reproduce this, tinkering with queries
> > > because I assumed that the problem had to be with the search query and
> > not
> > > with Solr. Search times for both queries (those with 0 hits and those
> > with
> > > 10k+ hits) are taking 30-40ms.
> > >
> > > Anyone run into something like this? Any ideas on something to look
> for?
> > >
> > > Thanks,
> > > Brian Lininger
> > >
> >
>
>
> --
>
>
> *Brian Lininger*
> Technical Architect, Infrastructure & Search
> *Veeva Systems *
> brian.linin...@veeva.com
> www.veeva.com
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