Issue:
IndexWriter of a specific core has been closed as a result of
NullPointerException at "SchemaSimilarityFactory.SchemaSimilarity.get" when
updating one of the documents.
After this exception, Solr stops indexing the next documents to this
specific core and we have to restart the Solr process in order to reopen
IndexWriter of this specific core.
Cause:
Raise condition between multiple threads that perform read/write to the same
object.
In this case, it is *volatile SolrCore core* in SchemaSimilarityFactory.
One thread calls inform() of SchemaSimilarityFactory with the new object of
SolrCore that is still under initialization (write operation)
When at the same time, another thread performs core.getLatestSchema() (at
SchemaSimilarityFactory.SchemaSimilarity.get) of this new SolrCore object
that still has not been fully initialized (read operation)
When inform of SchemaSimilarityFactory is called (write operation):
• During the creation of the new core
• During uploading transient core to transient cache
• During loading non-transient core to the memory (during Solr startup by
coreLoadExecutor thread)
When SchemaSimilarityFactory.SchemaSimilarity.get Similarity is called
(read operation)
• During indexing document
It seems like a bug in SolrCore.setLatestSchema()
The infrom() is called before initialization of schema
Stack of thread that performs inform:
at
org.apache.solr.search.similarities.SchemaSimilarityFactory.inform(SchemaSimilarityFactory.java:97)
at org.apache.solr.core.SolrCore.setLatestSchema(SolrCore.java:319)
at org.apache.solr.core.SolrCore.initSchema(SolrCore.java:1139)
at org.apache.solr.core.SolrCore.<init>(SolrCore.java:947)
at org.apache.solr.core.SolrCore.<init>(SolrCore.java:870)
at
org.apache.solr.core.CoreContainer.createFromDescriptor(CoreContainer.java:1189)
at org.apache.solr.core.CoreContainer.getCore(CoreContainer.java:1721)
at org.apache.solr.servlet.HttpSolrCall.init(HttpSolrCall.java:249)
at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:469)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:395)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:341)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1602)
at
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
at
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
at
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1588)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1345)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
at
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480)
at
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1557)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
at
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1247)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
at
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:220)
Stack of thread that performs get:
org.apache.solr.common.SolrException: Exception writing document id *** to
the index; possible analysis error.
at
org.apache.solr.update.DirectUpdateHandler2.addDoc(DirectUpdateHandler2.java:250)
at
org.apache.solr.update.processor.RunUpdateProcessor.processAdd(RunUpdateProcessorFactory.java:67)
at
org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:55)
at
org.apache.solr.update.processor.DistributedUpdateProcessor.doLocalAdd(DistributedUpdateProcessor.java:1002)
at
org.apache.solr.update.processor.DistributedUpdateProcessor.doVersionAdd(DistributedUpdateProcessor.java:1233)
at
org.apache.solr.update.processor.DistributedUpdateProcessor.lambda$versionAdd$2(DistributedUpdateProcessor.java:1082)
at
org.apache.solr.update.processor.DistributedUpdateProcessor$$Lambda$344/00000000A4008F60.apply(Unknown
Source)
at
org.apache.solr.update.VersionBucket.runWithLock(VersionBucket.java:50)
at
org.apache.solr.update.processor.DistributedUpdateProcessor.versionAdd(DistributedUpdateProcessor.java:1082)
at
org.apache.solr.update.processor.DistributedUpdateProcessor.processAdd(DistributedUpdateProcessor.java:694)
at
org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:55)
...............
Caused by: java.lang.NullPointerException
at
org.apache.solr.search.similarities.SchemaSimilarityFactory$SchemaSimilarity.get(SchemaSimilarityFactory.java:145)
at
org.apache.lucene.search.similarities.PerFieldSimilarityWrapper.computeNorm(PerFieldSimilarityWrapper.java:45)
at
org.apache.lucene.index.DefaultIndexingChain$PerField.finish(DefaultIndexingChain.java:752)
at
org.apache.lucene.index.DefaultIndexingChain.processDocument(DefaultIndexingChain.java:400)
at
org.apache.lucene.index.DocumentsWriterPerThread.updateDocument(DocumentsWriterPerThread.java:251)
at
org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:494)
at
org.apache.lucene.index.IndexWriter.updateDocument(IndexWriter.java:1616)
at
org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1235)
at
org.apache.solr.update.DirectUpdateHandler2.allowDuplicateUpdate(DirectUpdateHandler2.java:326)
at
org.apache.solr.update.DirectUpdateHandler2.addDoc0(DirectUpdateHandler2.java:291)
at
org.apache.solr.update.DirectUpdateHandler2.addDoc(DirectUpdateHandler2.java:235)
... 71 more
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