On Mar 16, 2009, at 4:15 AM, Richard Grantham wrote: > Hi list, > > I've posted before with regards to problems with clustered sessions, > but > I've had session-db related outages on two production servers within > half-an-hour of each other. I'm running Resin 3.1.8 with a clustered > persistent session configuration. I took a stacktrace when both > servers > stopped responding and analysed then with TDA. What I found was many > threads waiting on the internal Resin database, like this: > > "hmux-10.1.1.102:6800-10944$21858188" daemon prio=10 tid=0x5bc17800 > nid=0x7a9b waiting for monitor entry [0x59f7c000..0x59f7d120] > java.lang.Thread.State: BLOCKED (on object monitor) > at com.caucho.db.store.Store.writeBlock(Store.java:1730) > - locked <0x79f2aaa0> (a java.lang.Object) > at com.caucho.db.store.Block.writeImpl(Block.java:228) > at com.caucho.db.store.Block.write(Block.java:215) > at com.caucho.db.store.Block.commit(Block.java:178)
Can you send me the full thread dump? I'd need to look through the other threads to see what's holding that lock. -- Scott > > at > com.caucho.db.store.Transaction.writeData(Transaction.java:580) > at com.caucho.db.sql.QueryContext.unlock(QueryContext.java:537) > at com.caucho.db.sql.UpdateQuery.execute(UpdateQuery.java:118) > at > com > .caucho.db.jdbc.PreparedStatementImpl.execute(PreparedStatementImpl.j > ava:345) > at > com > .caucho.db.jdbc.PreparedStatementImpl.executeUpdate(PreparedStatement > Impl.java:313) > at > com.caucho.server.cluster.FileBacking.updateAccess(FileBacking.java: > 353) > at > com > .caucho.server.cluster.ClusterStore.updateAccess(ClusterStore.java:79 > 1) > at > com > .caucho.server.hmux.HmuxClusterRequest.accessObject(HmuxClusterReques > t.java:473) > at > com > .caucho.server.hmux.HmuxClusterRequest.handleRequest(HmuxClusterReque > st.java:215) > at > com.caucho.server.hmux.HmuxRequest.scanHeaders(HmuxRequest.java:655) > at > com.caucho.server.hmux.HmuxRequest.handleRequest(HmuxRequest.java:363) > at > com.caucho.server.port.TcpConnection.run(TcpConnection.java:682) > - locked <0xaf6462c8> (a java.lang.Object) > at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:730) > at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:649) > at java.lang.Thread.run(Thread.java:619) > > The session database currently stands at the 33Mb mark, which doesn't > seem excessive to me. Is there anything I can do to get to the > bottom of > the and solve this. I'm unable to switch to database backed sessions > due > to issues with expired sessions not being pushed out to all nodes in > the > cluster (I've pressed logout but I'm still logged in - posted about > this > before). > > Any help would be greatly appreciated. > > rgds, > > Richard > > > > Richard Grantham > Development > > ------------------------------- > rgrant...@limehousesoftware.co.uk > Limehouse Software Ltd > > DDI: (020) 7566 3324 > Main: (020) 7566 3320 > Fax: (020) 7566 3321 > > Limehouse Software Ltd > Bridewell Gate > 9 Bridewell Place > London > EC4V 6AW > > > Check out Limehouse Software's innovative solutions > www.limehousesoftware.co.uk - Transforming the way you publish and > consult on information > > The information contained in this e-mail or in any attachments is > confidential and is intended solely for the named addressee only. > Access to this e-mail by anyone else is unauthorised. If you are not > the intended recipient, please notify Limehouse Software Ltd > immediately by returning this e-mail to sender or calling 020 7566 > 3320 and do not read, use or disseminate the information. Opinions > expressed in this e-mail are those of the sender and not necessarily > the company. Although an active anti-virus policy is operated, the > company accepts no liability for any damage caused by any virus > transmitted by this e-mail, including any attachments. > > > _______________________________________________ > resin-interest mailing list > resin-interest@caucho.com > http://maillist.caucho.com/mailman/listinfo/resin-interest _______________________________________________ resin-interest mailing list resin-interest@caucho.com http://maillist.caucho.com/mailman/listinfo/resin-interest
