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https://issues.apache.org/jira/browse/CONNECTORS-100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12919481#action_12919481
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Karl Wright commented on CONNECTORS-100:
----------------------------------------
While I was unable to reproduce the hang, a possibly related problem
(CONNECTORS-111) I was able to reproduce. It seems plausible that the solution
to that problem also may fix this one.
My overall sense, though, is that Derby is simply not stable enough in a
multithreaded environment to rely on. I will be opening a ticket for using
HSQLDB instead for the example.
> DB lock timeout
> ---------------
>
> Key: CONNECTORS-100
> URL: https://issues.apache.org/jira/browse/CONNECTORS-100
> Project: ManifoldCF
> Issue Type: Bug
> Components: Framework core
> Environment: Running unmodified dist/example from trunk/ using the
> default configuration.
> Reporter: Andrzej Bialecki
> Assignee: Karl Wright
> Fix For: LCF Release 0.5
>
>
> When a job is started and running (via crawler-ui) occasionally it's not
> possible to display a list of running jobs. The problem persists even after
> restarting ACF. The following exception is thrown in the console:
> {code}
> org.apache.acf.core.interfaces.ACFException: Database exception: Exception
> doing query: A lock could not be obtained within the time requested
> at
> org.apache.acf.core.database.Database.executeViaThread(Database.java:421)
> at
> org.apache.acf.core.database.Database.executeUncachedQuery(Database.java:465)
> at
> org.apache.acf.core.database.Database$QueryCacheExecutor.create(Database.java:1072)
> at
> org.apache.acf.core.cachemanager.CacheManager.findObjectsAndExecute(CacheManager.java:144)
> at
> org.apache.acf.core.database.Database.executeQuery(Database.java:167)
> at
> org.apache.acf.core.database.DBInterfaceDerby.performQuery(DBInterfaceDerby.java:727)
> at
> org.apache.acf.crawler.jobs.JobManager.makeJobStatus(JobManager.java:5611)
> at
> org.apache.acf.crawler.jobs.JobManager.getAllStatus(JobManager.java:5549)
> at
> org.apache.jsp.showjobstatus_jsp._jspService(showjobstatus_jsp.java:316)
> at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
> at
> org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
> at
> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
> at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
> at
> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)
> at
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
> at
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
> at
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
> at
> org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
> at
> org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
> at
> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
> at org.mortbay.jetty.Server.handle(Server.java:326)
> at
> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
> at
> org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
> at
> org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
> at
> org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
> Caused by: java.sql.SQLTransactionRollbackException: A lock could not be
> obtained within the time requested
> at
> org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown
> Source)
> at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown
> Source)
> at
> org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown
> Source)
> at
> org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown
> Source)
> at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
> at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
> at org.apache.acf.core.database.Database.execute(Database.java:526)
> at
> org.apache.acf.core.database.Database$ExecuteQueryThread.run(Database.java:381)
> Caused by: java.sql.SQLException: A lock could not be obtained within the
> time requested
> at
> org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
> at
> org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown
> Source)
> ... 11 more
> Caused by: ERROR 40XL1: A lock could not be obtained within the time requested
> at org.apache.derby.iapi.error.StandardException.newException(Unknown
> Source)
> at
> org.apache.derby.impl.services.locks.ConcurrentLockSet.lockObject(Unknown
> Source)
> at
> org.apache.derby.impl.services.locks.ConcurrentLockSet.zeroDurationLockObject(Unknown
> Source)
> at
> org.apache.derby.impl.services.locks.AbstractPool.zeroDurationlockObject(Unknown
> Source)
> at
> org.apache.derby.impl.services.locks.ConcurrentPool.zeroDurationlockObject(Unknown
> Source)
> at
> org.apache.derby.impl.store.raw.xact.RowLocking2nohold.lockRecordForRead(Unknown
> Source)
> at
> org.apache.derby.impl.store.access.heap.HeapController.lockRow(Unknown Source)
> at
> org.apache.derby.impl.store.access.heap.HeapController.lockRow(Unknown Source)
> at
> org.apache.derby.impl.store.access.btree.index.B2IRowLocking3.lockRowOnPage(Unknown
> Source)
> at
> org.apache.derby.impl.store.access.btree.index.B2IRowLocking3._lockScanRow(Unknown
> Source)
> at
> org.apache.derby.impl.store.access.btree.index.B2IRowLockingRR.lockScanRow(Unknown
> Source)
> at
> org.apache.derby.impl.store.access.btree.BTreeForwardScan.fetchRows(Unknown
> Source)
> at
> org.apache.derby.impl.store.access.btree.BTreeScan.fetchNextGroup(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.BulkTableScanResultSet.reloadArray(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.BulkTableScanResultSet.getNextRowCore(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.getNextRowCore(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.GroupedAggregateResultSet.getRowFromResultSet(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.GroupedAggregateResultSet.getNextRowFromRS(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.GroupedAggregateResultSet.loadSorter(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.GroupedAggregateResultSet.openCore(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.openCore(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.open(Unknown Source)
> at
> org.apache.derby.impl.sql.GenericPreparedStatement.executeStmt(Unknown Source)
> at org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown
> Source)
> ... 5 more
> {code}
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