I did try that, yes. I tried that first in fact! It seems to fall back to a ./data directory relative to the _main_ solr directory (the one above all the cores), not the core instancedir. Which is not what I expected either.

I wonder if this should be considered a bug? I wonder if anyone has considered this and thought of changing/fixing it?

On 3/1/2011 4:23 AM, Jan Høydahl wrote:
Have you tried removing the<dataDir>  tag from solrconfig.xml? Then it should 
fall back to default ./data relative to core instancedir.

--
Jan Høydahl, search solution architect
Cominvent AS - www.cominvent.com

On 1. mars 2011, at 00.00, Jonathan Rochkind wrote:

Unless I'm doing something wrong, in my experience in multi-core Solr in 1.4.1, 
you NEED to explicitly provide an absolute path to the 'data' dir.

I set up multi-core like this:

<cores adminPath="/admin/cores">
<core name="some_core" instanceDir="some_core">
</core>
</cores>


Now, setting instanceDir like that works for Solr to look for the 'conf' 
directory in the default location you'd expect, ./some_core/conf.

You'd expect it to look for the 'data' dir for an index in ./some_core/data 
too, by default.  But it does not seem to. It's still looking for the 'data' 
directory in the _main_ solr.home/data, not under the relevant core directory.

The only way I can manage to get it to look for the /data directory where I 
expect is to spell it out with a full absolute path:

<core name="some_core" instanceDir="some_core">
<property name="dataDir" value="/path/to/main/solr/some_core/data" />
</core>

And then in the solrconfig.xml do a<dataDir>${dataDir}</dataDir>

Is this what everyone else does too? Or am I missing a better way of doing this?  I would 
have thought it would "just work", with Solr by default looking for a ./data 
subdir of the specified instanceDir.  But it definitely doesn't seem to do that.

Should it? Anyone know if Solr in trunk past 1.4.1 has been changed to do what 
I expect? Or am I wrong to expect it? Or does everyone else do multi-core in 
some different way than me where this doesn't come up?

Jonathan


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