Re: Deadlocks in the Filestore of Silde 2.1

Using the latest source from SVN you can set the "sequential-mode" to
"fail-fast" now. This checks for read/write conflicts, but does not
block anything in case of a conflict. It will instead fail immedeatly
with a conflict error.

HTH

Oliver

2007/4/18, aslam bari <[email protected]>:
> I was also facing this problem before. After that i did a small change and now it is working fine. What i did is:-
>
> 1) In domain.xml change sequential-mode parameter to "full" from "fine-grain" like this:-
> <parameter name="sequential-mode">full</parameter>
>
> 2)If you are using (Lucenen Indexing) then  In Domain.xml  use asyncron mode for this and also set priority to lowest like 1:- like this:-
>
>
> <contentindexer classname="org.apache.slide.index.lucene.LuceneContentIndexer">
> <parameter name="indexpath">${filespath}/../data/store/index_content</parameter>
> <parameter name="asynchron">false</parameter>
> <parameter name="priority">1</parameter>
> <parameter name="analyzer">org.apache.lucene.analysis.standard.StandardAnalyzer</parameter>
> <parameter name="max-field">100000</parameter>
> </contentindexer>
>
> Thanks....
>
>
> ----- Original Message ----
> From: Oliver Zeigermann <[email protected]>
> To: Slide Users Mailing List <[email protected]>; [email protected]
> Sent: Wednesday, 18 April, 2007 12:31:42 AM
> Subject: Re: Deadlocks in the Filestore of Silde 2.1
>
>
> I was just having a look at the 2.2 code and it looks that you can
> even switch off locking completely. Otherwise the locking code in 2.2
> looks much better than the code in 2.1
>
> Oliver
>
> 2007/4/17, Oliver Zeigermann <[email protected]>:
> > 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
> > > org.apache.commons.transaction.locking.GenericLock@76e9f537
> > > 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
> > > org.apache.commons.transaction.locking.GenericLock@667aeb85
> > > 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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