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https://issues.apache.org/jira/browse/SOLR-5323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13792824#comment-13792824
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Mark Miller commented on SOLR-5323:
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I also think this was a mistake - I don't know that we need another solr.home
type thing to address it though.
The root of the issue is that the clustering is not "really" lazy loading
clustering - and the current policy is to lazy load the contrib modules - and
that is because of the component. I think Erik is on to the right path with
lazy SearchComponents. I think that if the only request handlers that refer to
a search component are lazy, they should probably also init lazily. I have not
looked into how hard that is to do, but it seems like the correct fix to bring
clustering in line with the other contribs. I also think the whole enabled flag
we had is no good.
> Solr requires -Dsolr.clustering.enabled=false when pointing at example config
> -----------------------------------------------------------------------------
>
> Key: SOLR-5323
> URL: https://issues.apache.org/jira/browse/SOLR-5323
> Project: Solr
> Issue Type: Bug
> Components: contrib - Clustering
> Affects Versions: 4.5
> Environment: vanilla mac
> Reporter: John Berryman
> Assignee: Dawid Weiss
> Fix For: 4.6, 5.0
>
>
> my typical use of Solr is something like this:
> {code}
> cd SOLR_HOME/example
> cp -r solr /myProjectDir/solr_home
> java -jar -Dsolr.solr.home=/myProjectDir/solr_home start.jar
> {code}
> But in solr 4.5.0 this fails to start successfully. I get an error:
> {code}
> org.apache.solr.common.SolrException: Error loading class
> 'solr.clustering.ClusteringComponent'
> {code}
> The reason is because solr.clustering.enabled defaults to true now. I don't
> know why this might be the case.
> you can get around it with
> {code}
> java -jar -Dsolr.solr.home=/myProjectDir/solr_home
> -Dsolr.clustering.enabled=false start.jar
> {code}
> SOLR-4708 is when this became an issue.
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