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 *This email and the information it contains are intended for the intended recipient only, are confidential and may be privileged information exempt from disclosure by law.* *If you have received this email in error, please notify us immediately by reply email and delete this message from your computer.* *Please do not retain, copy or distribute this email.*
