Question

My application does very frequent solr writes from multiple clients via REST. I’m using the autocommit feature by using the “commitWithin” attribute. LockObtainFailedException start appearing after couple of days of use. I’m having a hard time figuring out what the problem might be. Any help is appreciated. I’m using Solr 3.1 with tomcat 6

here is the error dump from solr

---

HTTP Status 500 - Lock obtain timed out:      NativeFSLock@/var/lib/solr/data/index/write.lock

org.apache.lucene.store.LockObtainFailedException: Lock obtain timed out: NativeFSLock@/var/lib/solr/data/index/write.lock
at org.apache.lucene.store.Lock.obtain(Lock.java:84)
at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:1097)
at org.apache.solr.update.SolrIndexWriter.<init>(SolrIndexWriter.java:83)
at org.apache.solr.update.UpdateHandler.createMainIndexWriter(UpdateHandler.java:102)
at org.apache.solr.update.DirectUpdateHandler2.openWriter(DirectUpdateHandler2.java:174)
at org.apache.solr.update.DirectUpdateHandler2.addDoc(DirectUpdateHandler2.java:222)
at org.apache.solr.update.processor.RunUpdateProcessor.processAdd(RunUpdateProcessorFactory.java:61)
at org.apache.solr.handler.XMLLoader.processUpdate(XMLLoader.java:147)
at org.apache.solr.handler.XMLLoader.load(XMLLoader.java:77)
at org.apache.solr.handler.ContentStreamHandlerBase.handleRequestBody(ContentStreamHandlerBase.java:55)
at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:1360)
at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:356)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:252)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:662)
</h1><HR size="1" noshade="noshade"><p><b>type</b> Status report</p><p><b>message</b> <u>Lock obtain timed out: NativeFSLock@/var/lib/solr/data/index/write.lock

Answer 1

I increased the writeLockTimeout in solrconfig.xml to 20 seconds and it appears to be working fine now. Earlier it was set to 1 sec