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From Alexandre Rafalovitch <>
Subject Re: (ANNOUNCEMENT) Solr Examples reading group
Date Wed, 05 Oct 2016 16:15:06 GMT
I have an nearly minimal config for Solr 4.9, 5.5 and 6.2 at: . They are _quite_
feature minimal (6.2 does not even have ID or version), but they will
import and search example/exampledocs/*.xml without fuss

I challenge you to guess number of lines they take before looking :-)

As to minimal examples, I think that's absolutely the next step. Did
you ever notice that we don't even get too many question on the Solr
Users mailing list about the example - I suspect it is because people
get lost so fast they don't even know how to ask the questions.
SOLR-9601 will be my next experiment for that.

As to kitchen-sync vs the examples, maybe we need a "configuration"
configset that will have all the definitions and then have
Admin/Velocity/whatever UI that allows user pick a definition and
existing core on the same server and it will the
type/field/configuration command to that core. It is definitely doable
for schema. For solrconfig it is a bit more challenging as not
everything is API controlled yet and API itself - in my mind - is
still very raw. The support files is a small challenge too for
non-cloud mode. But this could be the dogfood project to fix that.

So, as a workflow, it would be:
1) bin/solr create -c mycore -d minimal_config
2) Experiment to the limit of that core's configuration (initial types, etc)
3) bin/solr create -c config -d configuration
4) Use the new core's enhanced UI to do whatever is needed to mycore
5) bin/solr delete -c config
6) Continue working with mycore

The other similar idea is a 3rd party solr config wizard that walks
the user through the choices and generates config files with/without
comments/links to ref guide. Then, it is not limited to Solr file
layout. On the other hand, people need to know the tool exists....

P.s. I will try very hard to be at the meetup on Tuesday, so will be
very happy to have an in-depth discussion about this topic

Newsletter and resources for Solr beginners and intermediates:

On 5 October 2016 at 21:15, Erick Erickson <> wrote:
> Charlie:
> I like that idea. It's bewildering how much stuff is in the config. I
> do think there's value in having it all there though since people
> won't even know to look in, say, "kitchen-sink-solrconfig.xml" for all
> the _other_ things that can be done....
> Perhaps comment out all the "extra stuff" and move it to the end of
> the config files?
> And how many people have been tripped up by un-defining the "text"
> field in the schema and still having things break by the "df" field
> being set to text in solrconfig.xml?
> Erick
> On Wed, Oct 5, 2016 at 1:29 AM, Charlie Hull <> wrote:
>> On 05/10/2016 02:19, Walter Underwood wrote:
>>> I’m trying to bring up 6.2.1 after experience with 1.2 through 5.5, and it
>>> is a mess.
>>> I’ve done solid good practice (Zookeeper ensemble, chroot, data on EBS
>>> volume),
>>> but I’m stuck with a completely non-instructive stack trace.
>>> We run a separate data directory and SOLR_HOME, which is poorly supported
>>> by
>>> the startup script. I gave up and used a symlink to make it sorta happy.
>>> Still, I’m stuck with this.
>>> org.apache.solr.common.SolrException: Error processing the request.
>>> CoreContainer is either not initialized or shutting down.
>>>         at
>>> org.apache.solr.servlet.SolrDispatchFilter.doFilter(
>>>         at
>>> org.apache.solr.servlet.SolrDispatchFilter.doFilter(
>>> I’ve tried loading configs with bin/solr and with I get useless
>>> error messages
>>> from each of them.
>>> I worked on a commercial search product for ten years, and this wouldn’t
>>> pass basic QA.
>>> We need to do some work, people.
>> Last week I had to upgrade a proof-of-concept demo that ran on Solr 4 to
>> 6.2.1, using the Sunburnt client. I thought I'd use the Files example to get
>> started. This wasn't exactly painless: I ended up having to disable Managed
>> Schemas (I couldn't get Solr to use the old schema.xml), mess around with
>> Sunburnt (which assumed a certain URL structure to read schema.xml) and
>> generally chop large chunks out solrconfig.xml until it began to work.
>> When we see clients with Solr issues the problems often stem from there
>> being *too much* in their configuration - they've started with one of the
>> example configs and added often conflicting settings, there's all kinds of
>> irrelevant stuff hanging around (you probably don't need a Hungarian stemmer
>> unless you're Hungarian), a zillion schema types you'll never need...I'm
>> beginning to wonder if an absolutely minimal Solr example configuration
>> might be a good idea. It's going to have to make assumptions (e.g. it's
>> probably going to assume English content) and it won't do anything
>> particularly clever, but I feel it might be a better place to start than
>> wondering what on earth all that commented-out XML does, especially the bits
>> that say 'you probably shouldn't use this in production'. You can always
>> copy those bits back in later...
>> I'll be in Boston next week if anyone wants to chat about this. Maybe I'll
>> have a go at our Lucene Hackday on Tuesday (still some places free!)
>> Cheers
>> Charlie
>>> wunder
>>> Walter Underwood
>>>  (my blog)
>>>> On Oct 4, 2016, at 5:59 PM, Alexandre Rafalovitch <>
>>>> wrote:
>>>> Hello,
>>>> Three weeks ago I asked this list whether there was an interest in
>>>> running a virtual examples reading group, with "all questions
>>>> welcome". The response was sufficient to start planning the first
>>>> study group.
>>>> The current projected date is start of November. You can register for
>>>> it at: (it is the same survey
>>>> as the first time - no need to do that again if you responded before).
>>>> The first run is free.
>>>> Regards,
>>>>    Alex.
>>>> P.s. If you have Solr-using customers (e.g. you are running a Solr
>>>> cloud business), feel free to announce this to them and/or run your
>>>> own outreach and contact me directly with bulk emails of those
>>>> interested.
>>>> P.p.s. I am also presenting on Solr examples at the Lucene/Solr
>>>> Revolution in about a week. If you have very strong opinions about
>>>> Solr examples, feel free to reach out directly and share them via
>>>> email or in person. The opinions do not have to be positive, though
>>>> having them constructive would be an nice. :-)
>>>> ----
>>>> Newsletter and resources for Solr beginners and intermediates:
>> --
>> Charlie Hull
>> Flax - Open Source Enterprise Search
>> tel/fax: +44 (0)8700 118334
>> mobile:  +44 (0)7767 825828
>> web:

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