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From Alexandre Rafalovitch <>
Subject Re: "Missing" Docs in Solr
Date Fri, 16 Aug 2019 10:51:15 GMT
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....


On Thu, Aug 15, 2019, 6:02 PM Brian Lininger, <>

> 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

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