Hi Arne! The stack trace tells you that another thread has the global read/write lock. So, correctly speaking this is a "live lock". The reason most likely is a thread that still runs and has forgotten to release this lock.
Having said this, even switching to a deadlock free solution will not help, as you have no deadlocks here. Cheers Oliver 2007/4/17, Arne v.Irmer <[EMAIL PROTECTED]>:
Hi, we are using slide in our e-learning platform http://ews2.uni-dortmund.de in a production environment. We get into deep trouble with deadlocks in Slide! I checked out Silde 2.2pre1. In the RELEASE-NOTES-2.2 there is the sentence: "- New option for a fine grained, deadlock-less locking scheme" My question is: - Should I change to 2.2pre1 for my productive environment? How can I switch back if we discover other problems with this pre-release? - Is there a patch for version 2.1. that fixes these deadlocks? Please help. Thanks in advance Arne v.Irmer Our configuration: Slide 2.1 with fixed hasmap "suspendedLocks" in org.apache.slide.store.ExtendedStore. using a filestore in Tomcat 5.5 Here are some stacktraces from the jconsole in the case of the deadlocks: Name: http-129.217.205.43-8080-Processor3 State: TIMED_WAITING on [EMAIL PROTECTED] Total blocked: 273 Total waited: 332 Stack trace: java.lang.Object.wait(Native Method) org.apache.commons.transaction.locking.GenericLock.acquire(GenericLock.java:241) org.apache.commons.transaction.locking.GenericLock.acquire(GenericLock.java:165) org.apache.slide.webdav.method.AbstractWebdavMethod.assureGlobalWriteLock(AbstractWebdavMethod.java:847) org.apache.slide.webdav.method.AbstractWebdavMethod.run(AbstractWebdavMethod.java:362) org.apache.slide.webdav.WebdavServlet.service(WebdavServlet.java:155) javax.servlet.http.HttpServlet.service(HttpServlet.java:802) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) org.apache.slide.webdav.filter.LogFilter.doFilter(LogFilter.java:141) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:524) org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:419) org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799) org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705) org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80) org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) java.lang.Thread.run(Thread.java:595) Name: http-129.217.205.43-8080-Processor3 State: TIMED_WAITING on [EMAIL PROTECTED] Total blocked: 44 Total waited: 80 Stack trace: java.lang.Object.wait(Native Method) org.apache.commons.transaction.locking.GenericLock.acquire(GenericLock.java:241) org.apache.commons.transaction.locking.GenericLock.acquire(GenericLock.java:165) org.apache.slide.webdav.method.AbstractWebdavMethod.assureGlobalReadLock(AbstractWebdavMethod.java:838) org.apache.slide.webdav.method.AbstractWebdavMethod.run(AbstractWebdavMethod.java:360) org.apache.slide.webdav.WebdavServlet.service(WebdavServlet.java:155) javax.servlet.http.HttpServlet.service(HttpServlet.java:802) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) org.apache.slide.webdav.filter.LogFilter.doFilter(LogFilter.java:141) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:524) org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:419) org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799) org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705) org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80) org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) java.lang.Thread.run(Thread.java:595) -- Dipl.-Phys. Arne v.Irmer Medienzentrum Universität Dortmund Emil-Figge-Straße 50 44227 Dortmund Tel.: ++49 231 755 7127 Fax : ++49 231 755 4597
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