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Posted to dev@lucene.apache.org by "Tommaso Teofili (Commented) (JIRA)" <ji...@apache.org> on 2012/03/20 21:49:39 UTC
[jira] [Commented] (SOLR-2983) Unable to load custom MergePolicy
[ https://issues.apache.org/jira/browse/SOLR-2983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13233731#comment-13233731 ]
Tommaso Teofili commented on SOLR-2983:
---------------------------------------
Agreed, I'm going to do the needed updates to changes.txt and upgrade/backcompat.
> 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
> Assignee: Tommaso Teofili
> Priority: Minor
> Fix For: 3.6, 4.0
>
> Attachments: SOLR-2983.patch
>
>
> 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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