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https://issues.apache.org/jira/browse/STANBOL-1081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13675626#comment-13675626
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Rupert Westenthaler commented on STANBOL-1081:
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The changed SolrServerAdapter now overrides the following Methods of the
CoreContainer
* create(CoreDescriptior): To ensure that the OsgiSolrResourceLoader is used to
init the SolrCore. NOTE: that ZooKeeper maanaged cores are not yet supported.
If a ZooKeeper Controller is present, the supoer implementation is called (what
will likely cause Exceptions during initialisation of the Core)
* register(Map<String,SolrCore>, String, SolrCore, boolesn): To ensure that
registered SolrCores are registered as OSGI services. NOTE the special case
where registration is posponed during the initial creation of the SolrCore
because this can cause a deadlock (see comments in the source for details)
* swap(String, String): To ensure that the OSGI serviceRegistration are updated
accordingly
Additional Changes:
* The methods of the SolrServerAdapter corresponding to the now overridden
methods of the wrapped CoreContainer where accordingly adapted
* The SolrServerAdapter does now hold an reference count on managed SolrCores.
This prevents the close of SolrCores shortly after the first registration (In
previous versions users should have noticed the same SolrCore to be initialised
twice because of that)
* The SolrServerAdapter does no longer decrease the reference count until it
reaches zero. This will avoid the Solr Error Messages about negative reference
counts, but also requires that other OSGI components to correctly call
SolrCore#close(). However an investigation of the current usage as shown that
mist likely EmbeddedSolrServers will be used to use obtained CoreContainers and
the EmbeddedSolrServer does correctly call close() on each obtained SolrCore.
> ReferencedSolrServer does not work with Solr 4
> ----------------------------------------------
>
> Key: STANBOL-1081
> URL: https://issues.apache.org/jira/browse/STANBOL-1081
> Project: Stanbol
> Issue Type: Bug
> Components: Commons
> Reporter: Rupert Westenthaler
> Assignee: Rupert Westenthaler
>
> The ReferencedSolrServer is not yet functional to the Solr 4 related changes
> in the commons.solr module. This is because in the case of the
> ReferencedSolrServer SolrCores are initialized in the constructor of the
> SolrServerAdapter (commons.solr.core), but this does not yet ensure that the
> OsgiSolrResourceLoader is used in that process. Because of that the
> ReferencedSolrServer can not load SolrCores that do use Analyzers that are
> not directly contained in the commons.solr.core bundle (e.g. ICU, SmartCN,
> ...)
> To solve this on needs to generalize the solution used to manually register
> SolrCores so that it does work for any SolrCore created by the CoreContainer
> (wrapped by the SolrServerAdapter).
> After some investigation it looks like overriding the "create(CoreDescriptor
> cd) : SolrCore" would be the best option to achieve this goal. Parsing the
> OsgiSolrResourceLoader in the constructor of the CoreContainer does not work
> as this is overridden by the CoreContainer.load(..) method.
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