Hi all,
I was trying to use the new 'shareSchema=true' feature in solr 1.4 and
it appears as though this will only happen in one configuration. I'd like
someone to confirm this for me and then we can file a bug on it.
This all happens in CoreContainer.create().
When you have shareSchema=true in solr.xml then an instance variable
indexSchemaCache is created in the CoreContainer instance.
This snippet is from CoreContainer.create
if (indexSchemaCache != null){
//schema sharing is enabled. so check if it already is loaded
[1] File schemFile = new File(solrLoader.getInstanceDir() + "conf" +
File.separator + dcore.getSchemaName());
if(schemFile. exists()){
[2] String key = schemFile.getAbsolutePath()+":"+new
SimpleDateFormat("yyyyMMddhhmmss").format(new Date(schemFile.lastModified()));
schema = indexSchemaCache.get(key);
if(schema == null){
log.info("creating new schema object for core: " + dcore.name);
schema = new IndexSchema(config, dcore.getSchemaName(), null);
indexSchemaCache.put(key,schema);
} else {
log.info("re-using schema object for core: " + dcore.name);
}
}
}
if(schema == null){
schema = new IndexSchema(config, dcore.getSchemaName(), null);
}
A couple of points:
[1] dcore.getSchemaName() is the value that is in the 'schema'
<core /> element in the solr.xml. This means that the this MUST
be relative to the core-instance-dir/conf directory. Putting an
absolute path in the xml means that schemFile.exists() will always
return false. That is, if I put in
<core name="core0"
schema="/opt/search/solr/conf/multicore-common-schema.xml" />
then schemFile will have a path of:
/path/to/core0/instanceDir/conf/opt/search/solr/conf/multicore-common-schema.xml
Which never exists.
[2] If you do use a relative path to the schema.xml file, then the key will
always be
unique, since each schemFile is relative to a core's instanceDir, the core
name is
in the path and schemFile.getAbsolutePathe() will always be unique for
every core.
The result of this is, if I wanted to use shareSchema, it looks like the
only way for that to happen, is if two cores are using the same instanceDir
but different dataDir.
I tried a test with this solr.xml in the example multicore configurae, and this
appears to be the only way to reuse the schema instance, and to me this has a
bit of a smell:
<solr persistent="false">
<cores adminPath="/admin/cores" shareSchema="true" >
<core name="core0" instanceDir="mcore" schema="schema-common.xml"
dataDir="core0/data" />
<core name="core1" instanceDir="mcore" schema="schema-common.xml"
dataDir="core1/data" />
</cores>
</solr>
In my initial playing with this feature, I assumed that just putting in
the full path to a common schema.xml file would do the trick. That is
evidently not the way it works.
What is the way that shareSchema=true is supposed to work?
enjoy,
-jeremy
--
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Jeremy Hinegardner jer...@hinegardner.org
