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https://issues.apache.org/jira/browse/SOLR-14450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17096635#comment-17096635
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Andrzej Bialecki commented on SOLR-14450:
-----------------------------------------
Indeed, this iwRef should be called regardless of the withCoreInfo option.
> SegmentsInfoRequestHandler doesn't properly close ref-counted IW
> ----------------------------------------------------------------
>
> Key: SOLR-14450
> URL: https://issues.apache.org/jira/browse/SOLR-14450
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 8.5
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Minor
>
> As reported on the mailing list by Tiziano Degaetano:
> I’m digging in an issue getting timeouts doing a managed schema change using
> the schema api.
> The call hangs reloading the cores (does not recover until restarting the
> node):
> sun.misc.Unsafe.park(Native Method)
> java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source)
>
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireNanos(Unknown
> Source)
>
> java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireNanos(Unknown
> Source)
> java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.tryLock(Unknown
> Source)
>
> org.apache.solr.update.DefaultSolrCoreState.lock(DefaultSolrCoreState.java:179)
>
> org.apache.solr.update.DefaultSolrCoreState.newIndexWriter(DefaultSolrCoreState.java:230)
> org.apache.solr.core.SolrCore.reload(SolrCore.java:696)
> org.apache.solr.core.CoreContainer.reload(CoreContainer.java:1558)
> org.apache.solr.schema.SchemaManager.doOperations(SchemaManager.java:133)
>
> org.apache.solr.schema.SchemaManager.performOperations(SchemaManager.java:92)
>
> org.apache.solr.handler.SchemaHandler.handleRequestBody(SchemaHandler.java:90)
>
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:211)
> org.apache.solr.core.SolrCore.execute(SolrCore.java:2596)
> org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:802)
> org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:579)
> After a while I realized it was only deadlocked, after I used the AdminUI to
> view the segments info of the core.
> So my question: is this line correct? If withCoreInfo is false iwRef.decref()
> will not be called to release the reader lock, preventing any further writer
> locks.
>
> [https://github.com/apache/lucene-solr/blob/3a743ea953f0ecfc35fc7b198f68d142ce99d789/solr/core/src/java/org/apache/solr/handler/admin/SegmentsInfoRequestHandler.java#L144]
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