[ http://issues.apache.org/jira/browse/IBATIS-223?page=comments#action_12360732 ]
Clinton Begin commented on IBATIS-223: -------------------------------------- Can you try the LRU or FIFO cache provided by iBATIS instead of OSCache, just for testing? Can you recreate the problem without OSCache? We just want to be sure it's an iBATIS bug, and not OSCache. Thanks, Clinton > Thread deadlock due to CacheModel.flush() > ----------------------------------------- > > Key: IBATIS-223 > URL: http://issues.apache.org/jira/browse/IBATIS-223 > Project: iBatis for Java > Type: Bug > Components: SQL Maps > Versions: 2.1.5 > Environment: Redhat Linux ES 3.0 + Weblogic 8.1SP4+iBatis 2.1.5 + OSCache > 2.2 + JGroups 2.2.8 > Reporter: Vincent Royer > Priority: Minor > > As shown by the following thread dump, a deadlock occurs between thead 7 and > 10. As the result, almost all theads were locked due to this deadlock. > It seems that thread 10 locks the [EMAIL PROTECTED] object in > CacheModel.getObject() then is locked on [EMAIL PROTECTED] in > CacheModel.flush(). In the same time, thread 7 locks [EMAIL PROTECTED] in > CachingStatement.executeQueryForList(), then is lock on [EMAIL PROTECTED] > when calling CacheModel.getLockKey() from CacheModel.putObject(). > Of course, such deadlock occur when 2 threads work with the same cached > object and when this object is often flushed. > Thread-0xc00 "ExecuteThread: '10' for queue: > 'ExecutionAsynchroneThreadQueue'" <Active, priority=5, DAEMON> { > java/util/HashMap.get(Ljava/lang/Object;)Ljava/lang/Object;(Optimized > Method) > > com/ibatis/sqlmap/engine/cache/CacheModel.getObject(Lcom/ibatis/sqlmap/engine/cache/CacheKey;)Ljava/lang/Object;(Optimized > Method) > ^-- Holding lock: com/ibatis/sqlmap/engine/cache/[EMAIL PROTECTED] lock] > > com/ibatis/sqlmap/engine/mapping/statement/CachingStatement.executeQueryForList(Lcom/ibatis/sqlmap/engine/scope/RequestScope;Lcom/ibatis/s > > qlmap/engine/transaction/Transaction;Ljava/lang/Object;II)Ljava/util/List;(Optimized > Method) > > com/ibatis/sqlmap/engine/impl/SqlMapSessionImpl.queryForList(Ljava/lang/String;Ljava/lang/Object;)Ljava/util/List;(Optimized > Method) > > cofidis/fwk/ancestor/DaoAncestor$3.executeSqlAction(Lcom/ibatis/sqlmap/client/SqlMapSession;)Ljava/lang/Object;(Optimized > Method) > .... > Thread-0xa80 "ExecuteThread: '7' for queue: 'ExecutionAsynchroneThreadQueue'" > <Active, priority=5, DAEMON> { > -- Blocked trying to get lock: com/ibatis/sqlmap/engine/cache/[EMAIL > PROTECTED] lock] > jrockit/vm/Threads.shortNap(I)V(Native Method) > jrockit/vm/Locks.waitForThinRelease(Ljava/lang/Object;I)I(Optimized > Method) > > jrockit/vm/Locks.monitorEnterSecondStage(Ljava/lang/Object;I)Ljava/lang/Object;(Optimized > Method) > > jrockit/vm/Locks.monitorEnter(Ljava/lang/Object;)Ljava/lang/Object;(Native > Method) > > com/ibatis/sqlmap/engine/cache/CacheModel.getLock(Lcom/ibatis/sqlmap/engine/cache/CacheKey;)Ljava/lang/Object;(CacheModel.java:324) > > > com/ibatis/sqlmap/engine/cache/CacheModel.putObject(Lcom/ibatis/sqlmap/engine/cache/CacheKey;Ljava/lang/Object;)V(CacheModel.java:313) > > > com/ibatis/sqlmap/engine/mapping/statement/CachingStatement.executeQueryForList(Lcom/ibatis/sqlmap/engine/scope/RequestScope;Lcom/ibatis/s > > qlmap/engine/transaction/Transaction;Ljava/lang/Object;II)Ljava/util/List;(Optimized > Method) > ^-- Holding lock: java/lang/[EMAIL PROTECTED] lock] > > com/ibatis/sqlmap/engine/impl/SqlMapSessionImpl.queryForList(Ljava/lang/String;Ljava/lang/Object;)Ljava/util/List;(Optimized > Method) > > cofidis/fwk/ancestor/DaoAncestor$3.executeSqlAction(Lcom/ibatis/sqlmap/client/SqlMapSession;)Ljava/lang/Object;(Optimized > Method) > > cofidis/fwk/ancestor/DaoAncestor.execute(Lcofidis/fwk/ancestor/DaoAncestor$DaoCallback;)Ljava/lang/Object;(Optimized > Method) > > cofidis/fwk/ancestor/DaoAncestor.executeWithListResult(Lcofidis/fwk/ancestor/DaoAncestor$DaoCallback;)Ljava/util/List;(Optimized > Method) > > cofidis/fwk/ancestor/DaoAncestor.queryForList(Ljava/lang/String;Ljava/lang/Object;)Ljava/util/List;(Optimized > Method) > .... > Thread-0xa00 "ExecuteThread: '6' for queue: 'ExecutionAsynchroneThreadQueue'" > <Active, priority=5, DAEMON> { > -- Blocked trying to get lock: com/ibatis/sqlmap/engine/cache/[EMAIL > PROTECTED] lock] > jrockit/vm/Threads.shortNap(I)V(Native Method) > jrockit/vm/Locks.waitForThinRelease(Ljava/lang/Object;I)I(Optimized > Method) > > jrockit/vm/Locks.monitorEnterSecondStage(Ljava/lang/Object;I)Ljava/lang/Object;(Optimized > Method) > > com/ibatis/sqlmap/engine/cache/CacheModel.getObject(Lcom/ibatis/sqlmap/engine/cache/CacheKey;)Ljava/lang/Object;(Optimized > Method) > > com/ibatis/sqlmap/engine/mapping/statement/CachingStatement.executeQueryForList(Lcom/ibatis/sqlmap/engine/scope/RequestScope;Lcom/ibatis/s > > qlmap/engine/transaction/Transaction;Ljava/lang/Object;II)Ljava/util/List;(Optimized > Method) -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
