Uwe Schindler created SOLR-3716:
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Summary: Make SolrResourceLoaders ClassLoader available as context
class loader
Key: SOLR-3716
URL: https://issues.apache.org/jira/browse/SOLR-3716
Project: Solr
Issue Type: Bug
Components: scripts and tools
Reporter: Uwe Schindler
Fix For: 4.0, 5.0
SOLR-1725 and other issues (recent changes to analysis factories and codecs)
make it possible to plug in extensions like analyzer factories, codecs,
scripting engines or TIKA parsers (TIKA extraction plugin!!!) as SPIs. The
current problem (we solved this alreeady for codecs and analyzer factories with
a classloader-reload hack: LUCENE-4259) is the following:
You have to unpack WAR file and repack with the missing JAR files. If you would
do it the "solr way" and put those jars into the $SOLR_HOME/lib folder like
plugins, they are not seen. The problem is that plugins loaded by solr are
loaded using SolrResourceLoader's classloader (configureable via
solrconfig.xml), but as this classloader is not also context classloader, SPI
does not look into it, so scripting engines, TIKA plugins, (previously codecs)
are not seen.
We should investigate how to manage setting the context classloader of all
threads solr ever sees to point to our own solr classloader.
When we do this, I also suggest to only ship with TIKA core libs but not
tika-parsers and the big dependency hell. TIKA parsers are also loaded via SPI,
so user can download the TIKA parser distribution and drop into $SOLR_HOME/lib.
By that a user can also use only those extraction plugins really needed. The
current solr distribution only consists of mostly useless JAR files (for many
users) for Solr Extraction handler. We dont need to ship with all of them, we
can just tell the user how to "install" the needed SPIs. The same for
analysis-extras (user only needs to copy morphologic JAR or smartchinese JAR
into $SOLR_HOME/lib - this works already!!!). No need for the "hull contrib".
Scripting engines is the same.
We should just ship with some scripts (ANT based) to download the JAR files
into $SOLR_HOME.
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