Unable to load custom MergePolicy
---------------------------------
Key: SOLR-2983
URL: https://issues.apache.org/jira/browse/SOLR-2983
Project: Solr
Issue Type: Bug
Reporter: Mathias Herberts
As part of a recent upgrade to Solr 3.5.0 we encountered an error related to
our use of LinkedIn's ZoieMergePolicy.
It seems the code that loads a custom MergePolicy was at some point moved into
SolrIndexConfig.java from SolrIndexWriter.java, but as this code was copied
verbatim it now contains a bug:
try {
policy = (MergePolicy)
schema.getResourceLoader().newInstance(mpClassName, null, new
Class[]{IndexWriter.class}, new Object[]{this});
} catch (Exception e) {
policy = (MergePolicy)
schema.getResourceLoader().newInstance(mpClassName);
}
'this' is no longer an IndexWriter but a SolrIndexConfig, therefore the call to
newInstance will always throw an exception and the catch clause will be
executed. If the custom MergePolicy does not have a default constructor (which
is the case of ZoieMergePolicy), the second attempt to create the MergePolicy
will also fail and Solr won't start.
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