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From Bob Cook <bcook.the...@gmail.com>
Subject Re: Lib Directives in SolrConfig when using SolrCloud
Date Tue, 03 Jan 2017 15:29:58 GMT
Thanks Shawn.  So I'm not insane!

Is there a way to specify a "jar" load order?
I'm trying to use UIMA's concept mapper and it requires a particular load
order, otherwise it
doesn't instantiate and errors out.  I was able to do this with the "lib"
directives.


Thanks again.

Bob

On Tue, Jan 3, 2017 at 12:13 AM, Shawn Heisey <apache@elyograg.org> wrote:

> On 1/2/2017 7:07 PM, Bob Cook wrote:
> > I've create some custom plugin that I put in a lib directory at the
> > same level as the conf directory for the core which is loaded via the
> > lib directives in solrconfig.xml /solrdata/CoreName/conf
> > /solrdata/CoreName/lib /solrdata/CoreName/core.properties This works
> > great when using Solr. But when I use SolrCloud, I get an error when
> > creating the collection as it can't find the plugin libraries. Now
> > that Zookeeper is managing the conf directory (configuration files,
> > i.e. solrconfig.xml), what is the relative path in solrconfig.xml
> > pointing to?
>
> I actually do not know what the path for lib directives is relative to
> when running SolrCloud.  Most things in a core config are relative to
> the location of the config file itself, but in this case, the config
> file is not on the filesystem at all, it's in zookeeper, and I don't
> think Solr can use jars in zookeeper.  Also there's a size limit of one
> megabyte for items in zookeeper without special config, and increasing
> the limit is not recommended.
>
> > how do I specify the relative path, or do I need to specify an
> > absolute path? Or do I need to put the libraries somewhere else?
>
> My recommendation:  Do not use "lib" directives, or any other kind of
> jar-loading related config including sharedLib, at all.  On each
> machine, create a "lib" directory in the solr home and place all your
> extra jars there.  The solr home is where solr.xml lives and where the
> core directories normally go.  All jars in this lib directory will be
> loaded exactly once at startup and made available to all cores, without
> *any* config.
>
> You can also create a lib directory inside the core's instanceDir, which
> is also automatically loaded by Solr without config, but this presents a
> bit of a catch-22 problem where you can't create the lib directory until
> the core exists, but can't get the core to work properly until the lib
> directory exists.
>
> There is a feature in SolrCloud for loading jars from a distributed
> collection.  It doesn't work everywhere in Solr, but classes specified
> in solrconfig.xml, for things like request handlers, should work.
>
> https://cwiki.apache.org/confluence/display/solr/Blob+Store+API
>
> There is an enhancement request filed to allow the schema to use jars
> from the blob store, but it hasn't received much attention yet:
>
> https://issues.apache.org/jira/browse/SOLR-9175
>
> Thanks,
> Shawn
>
>

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