Hi Tiziano, Indeed, this looks like a bug - good catch! Please file a Jira issue, I’ll get to it soon.
> On 23 Apr 2020, at 00:19, Tiziano Degaetano <tiziano.degaet...@conweaver.com> > wrote: > > Hello, > > 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 > > Regards, > Tiziano >
