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What to do with OutOfMemory error?

Question asked by nm_santos on Jul 5, 2012
Latest reply on Jul 10, 2012 by nm_santos
Hi,

How much memory should alfresco normally use?

I'm running alfresco 4.0 on a computer with 4gb of memory.

I created two amps, and a client that interacts with the web service api.

When I send a file, small sized (< 1MB), alfresco takes a longe time to process it, and the document library browsing is slow.

The error I get is
 Exception in thread "SolrTrackerScheduler_QuartzSchedulerThread" java.lang.OutOfMemoryError: GC overhead limit exceeded
2012-07-05 15:57:06,194  ERROR [extensions.webscripts.AbstractRuntime] [http-8080-3] Exception from executeScript - redirecting to status template error: 06050016 Exception in Transaction.
2012-07-05 15:57:32,638  WARN  [post.lookup.PostLookup] [DefaultScheduler_Worker-5] Still busy …
Exception in thread "JobAcquisitionThread" Exception in thread "DefaultScheduler_QuartzSchedulerThread"    at java.util.TreeMap.put(TreeMap.java:554)
   at java.util.TreeSet.add(TreeSet.java:238)
   at org.quartz.CronExpression.addToSet(CronExpression.java:1008)
   at org.quartz.CronExpression.storeExpressionVals(CronExpression.java:571)
   at org.quartz.CronExpression.buildExpression(CronExpression.java:430)
   at org.quartz.CronExpression.<init>(CronExpression.java:255)
   at org.quartz.CronExpression.clone(CronExpression.java:1571)
   at org.quartz.CronTrigger.clone(CronTrigger.java:464)
   at org.quartz.simpl.RAMJobStore.applyMisfire(RAMJobStore.java:1194)
   at org.quartz.simpl.RAMJobStore.acquireNextTrigger(RAMJobStore.java:1249)
   at org.quartz.core.QuartzSchedulerThread.run(QuartzSchedulerThread.java:264)
java.lang.OutOfMemoryError: GC overhead limit exceeded
2012-07-05 15:58:12,154  ERROR [extensions.webscripts.AbstractRuntime] [http-8443-2] Exception from executeScript - redirecting to status template error: 06050013 Wrapped Exception (with status template): GC overhead limit exceeded
org.springframework.extensions.webscripts.WebScriptException: 06050013 Wrapped Exception (with status template): GC overhead limit exceeded
   at org.springframework.extensions.webscripts.AbstractWebScript.createStatusException(AbstractWebScript.java:970)
   at org.springframework.extensions.webscripts.DeclarativeWebScript.execute(DeclarativeWebScript.java:171)
   at org.alfresco.repo.web.scripts.RepositoryContainer$2.execute(RepositoryContainer.java:393)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:388)
   at org.alfresco.repo.web.scripts.RepositoryContainer.transactionedExecute(RepositoryContainer.java:462)
   at org.alfresco.repo.web.scripts.RepositoryContainer.transactionedExecuteAs(RepositoryContainer.java:500)
   at org.alfresco.repo.web.scripts.RepositoryContainer.executeScript(RepositoryContainer.java:275)
   at org.springframework.extensions.webscripts.AbstractRuntime.executeScript(AbstractRuntime.java:372)
   at org.springframework.extensions.webscripts.AbstractRuntime.executeScript(AbstractRuntime.java:209)
   at org.springframework.extensions.webscripts.servlet.WebScriptServlet.service(WebScriptServlet.java:118)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
   at org.alfresco.web.app.servlet.GlobalLocalizationFilter.doFilter(GlobalLocalizationFilter.java:58)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
   at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:563)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
   at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
   at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
   at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
   at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.OutOfMemoryError: GC overhead limit exceeded
java.lang.OutOfMemoryError: GC overhead limit exceeded
   at java.lang.ThreadLocal$ThreadLocalMap.set(ThreadLocal.java:424)
   at java.lang.ThreadLocal$ThreadLocalMap.access$100(ThreadLocal.java:242)
   at java.lang.ThreadLocal.setInitialValue(ThreadLocal.java:145)
   at java.lang.ThreadLocal.get(ThreadLocal.java:131)
   at org.apache.ibatis.executor.ErrorContext.instance(ErrorContext.java:20)
   at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:83)
   at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSession(DefaultSqlSessionFactory.java:32)
   at org.activiti.engine.impl.db.DbSqlSession.<init>(DbSqlSession.java:86)
   at org.activiti.engine.impl.db.DbSqlSessionFactory.openSession(DbSqlSessionFactory.java:77)
   at org.activiti.engine.impl.interceptor.CommandContext.getSession(CommandContext.java:177)
   at org.activiti.engine.impl.persistence.AbstractManager.getSession(AbstractManager.java:56)
   at org.activiti.engine.impl.persistence.AbstractManager.getDbSqlSession(AbstractManager.java:52)
   at org.activiti.engine.impl.persistence.entity.JobManager.findNextJobsToExecute(JobManager.java:97)
   at org.activiti.engine.impl.cmd.AcquireJobsCmd.execute(AcquireJobsCmd.java:49)
   at org.activiti.engine.impl.cmd.AcquireJobsCmd.execute(AcquireJobsCmd.java:32)
   at org.activiti.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)
   at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:42)
   at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:42)
   at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130)
   at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:40)
   at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)
   at org.activiti.engine.impl.jobexecutor.JobAcquisitionThread.run(JobAcquisitionThread.java:63)
2012-07-05 15:58:12,221  INFO  [webscripts.connector.RemoteClient] [http-8080-1] Error status 499 Read timed out
java.net.SocketTimeoutException: Read timed out
   at java.net.SocketInputStream.socketRead0(Native Method)
   at java.net.SocketInputStream.read(SocketInputStream.java:129)
   at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
   at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
   at org.apache.commons.httpclient.HttpParser.readRawLine(HttpParser.java:78)
   at org.apache.commons.httpclient.HttpParser.readLine(HttpParser.java:106)
   at org.apache.commons.httpclient.HttpConnection.readLine(HttpConnection.java:1116)
   at org.apache.commons.httpclient.HttpMethodBase.readStatusLine(HttpMethodBase.java:1973)
   at org.apache.commons.httpclient.HttpMethodBase.readResponse(HttpMethodBase.java:1735)
   at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:1098)
   at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:398)
   at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
   at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
   at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)
   at org.springframework.extensions.webscripts.connector.RemoteClient.service(RemoteClient.java:966)
   at org.springframework.extensions.webscripts.connector.RemoteClient.service(RemoteClient.java:750)
   at org.springframework.extensions.webscripts.connector.RemoteClient.call(RemoteClient.java:498)
   at org.springframework.extensions.webscripts.connector.RemoteClient.call(RemoteClient.java:432)
   at org.springframework.extensions.webscripts.connector.HttpConnector.call(HttpConnector.java:70)
   at org.springframework.extensions.webscripts.RequestCachingConnector.call(RequestCachingConnector.java:88)
   at org.springframework.extensions.webscripts.connector.AuthenticatingConnector.call(AuthenticatingConnector.java:136)
   at org.springframework.extensions.webscripts.ScriptRemoteConnector.call(ScriptRemoteConnector.java:95)
   at org.springframework.extensions.webscripts.ScriptRemote.call(ScriptRemote.java:184)
   at sun.reflect.GeneratedMethodAccessor563.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:155)
   at org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:243)
   at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:66)
   at org.mozilla.javascript.gen.c14._c20(file:/D:/Alfresco/tomcat/webapps/share/WEB-INF/classes/alfresco/site-webscripts/org/alfresco/components/documentlibrary/data/surf-doclist.get.js:832)
   at org.mozilla.javascript.gen.c14.call(file:/D:/Alfresco/tomcat/webapps/share/WEB-INF/classes/alfresco/site-webscripts/org/alfresco/components/documentlibrary/data/surf-doclist.get.js)
   at org.mozilla.javascript.optimizer.OptRuntime.callName0(OptRuntime.java:108)
   at org.mozilla.javascript.gen.c14._c0(file:/D:/Alfresco/tomcat/webapps/share/WEB-INF/classes/alfresco/site-webscripts/org/alfresco/components/documentlibrary/data/surf-doclist.get.js:854)
   at org.mozilla.javascript.gen.c14.call(file:/D:/Alfresco/tomcat/webapps/share/WEB-INF/classes/alfresco/site-webscripts/org/alfresco/components/documentlibrary/data/surf-doclist.get.js)
   at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:393)
   at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:2834)
   at org.mozilla.javascript.gen.c14.call(file:/D:/Alfresco/tomcat/webapps/share/WEB-INF/classes/alfresco/site-webscripts/org/alfresco/components/documentlibrary/data/surf-doclist.get.js)
   at org.mozilla.javascript.gen.c14.exec(file:/D:/Alfresco/tomcat/webapps/share/WEB-INF/classes/alfresco/site-webscripts/org/alfresco/components/documentlibrary/data/surf-doclist.get.js)
   at org.springframework.extensions.webscripts.processor.JSScriptProcessor.executeScriptImpl(JSScriptProcessor.java:318)
   at org.springframework.extensions.webscripts.processor.JSScriptProcessor.executeScript(JSScriptProcessor.java:192)
   at org.springframework.extensions.webscripts.AbstractWebScript.executeScript(AbstractWebScript.java:1193)
   at org.springframework.extensions.webscripts.DeclarativeWebScript.execute(DeclarativeWebScript.java:86)
   at org.springframework.extensions.webscripts.PresentationContainer.executeScript(PresentationContainer.java:70)
   at org.springframework.extensions.webscripts.LocalWebScriptRuntimeContainer.executeScript(LocalWebScriptRuntimeContainer.java:239)
   at org.springframework.extensions.webscripts.AbstractRuntime.executeScript(AbstractRuntime.java:372)
   at org.springframework.extensions.webscripts.AbstractRuntime.executeScript(AbstractRuntime.java:209)
   at org.springframework.extensions.webscripts.servlet.mvc.WebScriptView.renderMergedOutputModel(WebScriptView.java:99)
   at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
   at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047)
   at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817)
   at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
   at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
   at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
   at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
   at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
   at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
   at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
   at org.tuckey.web.filters.urlrewrite.NormalRewrittenUrl.doRewrite(NormalRewrittenUrl.java:195)
   at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:159)
   at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:141)
   at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:90)
   at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:417)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
   at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:470)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
   at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:861)
   at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
   at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1584)
   at java.lang.Thread.run(Thread.java:662)
2012-07-05 15:58:12,335  ERROR [activities.feed.AbstractFeedGenerator] [DefaultScheduler_Worker-9] Exception during generation of feeds
java.lang.IllegalStateException: lockToken is not null
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator$LockTracker.refreshLock(AbstractFeedGenerator.java:231)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator.acquireLock(AbstractFeedGenerator.java:210)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator.execute(AbstractFeedGenerator.java:161)
   at org.alfresco.repo.activities.feed.FeedGeneratorJob.execute(FeedGeneratorJob.java:50)
   at org.quartz.core.JobRunShell.run(JobRunShell.java:216)
   at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:563)
2012-07-05 15:58:12,450  ERROR [quartz.core.JobRunShell] [DefaultScheduler_Worker-6] Job DEFAULT.feedGeneratorJobDetail threw an unhandled Exception:
org.alfresco.repo.lock.LockAcquisitionException: 06050018 Failed to release lock '{http://www.alfresco.org/model/system/1.0}activityfeedgenerator' using token '2fcea96a-0c93-43bd-81df-41f70e62a569'.  The lock has expired and been taken by another process.
   at org.alfresco.repo.domain.locks.AbstractLockDAOImpl.updateLocks(AbstractLockDAOImpl.java:218)
   at org.alfresco.repo.domain.locks.AbstractLockDAOImpl.releaseLock(AbstractLockDAOImpl.java:172)
   at org.alfresco.repo.lock.JobLockServiceImpl$3.execute(JobLockServiceImpl.java:428)
   at org.alfresco.repo.lock.JobLockServiceImpl$3.execute(JobLockServiceImpl.java:425)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:388)
   at org.alfresco.repo.lock.JobLockServiceImpl.releaseLock(JobLockServiceImpl.java:432)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator$LockTracker.releaseLock(AbstractFeedGenerator.java:241)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator.releaseLock(AbstractFeedGenerator.java:220)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator.execute(AbstractFeedGenerator.java:198)
   at org.alfresco.repo.activities.feed.FeedGeneratorJob.execute(FeedGeneratorJob.java:50)
   at org.quartz.core.JobRunShell.run(JobRunShell.java:216)
   at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:563)
2012-07-05 15:58:12,450  ERROR [quartz.core.JobRunShell] [DefaultScheduler_Worker-9] Job DEFAULT.feedGeneratorJobDetail threw an unhandled Exception:
org.alfresco.repo.lock.LockAcquisitionException: 06050019 Failed to release lock '{http://www.alfresco.org/model/system/1.0}activityfeedgenerator' using token '2fcea96a-0c93-43bd-81df-41f70e62a569'.  The lock has expired and been taken by another process.
   at org.alfresco.repo.domain.locks.AbstractLockDAOImpl.updateLocks(AbstractLockDAOImpl.java:218)
   at org.alfresco.repo.domain.locks.AbstractLockDAOImpl.releaseLock(AbstractLockDAOImpl.java:172)
   at org.alfresco.repo.lock.JobLockServiceImpl$3.execute(JobLockServiceImpl.java:428)
   at org.alfresco.repo.lock.JobLockServiceImpl$3.execute(JobLockServiceImpl.java:425)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:388)
   at org.alfresco.repo.lock.JobLockServiceImpl.releaseLock(JobLockServiceImpl.java:432)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator$LockTracker.releaseLock(AbstractFeedGenerator.java:241)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator.releaseLock(AbstractFeedGenerator.java:220)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator.execute(AbstractFeedGenerator.java:198)
   at org.alfresco.repo.activities.feed.FeedGeneratorJob.execute(FeedGeneratorJob.java:50)
   at org.quartz.core.JobRunShell.run(JobRunShell.java:216)
   at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:563)
2012-07-05 15:58:12,461  ERROR [quartz.core.ErrorLogger] [DefaultScheduler_Worker-6] Job (DEFAULT.feedGeneratorJobDetail threw an exception.
org.quartz.SchedulerException: Job threw an unhandled exception. [See nested exception: org.alfresco.repo.lock.LockAcquisitionException: 06050018 Failed to release lock '{http://www.alfresco.org/model/system/1.0}activityfeedgenerator' using token '2fcea96a-0c93-43bd-81df-41f70e62a569'.  The lock has expired and been taken by another process.]
   at org.quartz.core.JobRunShell.run(JobRunShell.java:227)
   at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:563)
Caused by: org.alfresco.repo.lock.LockAcquisitionException: 06050018 Failed to release lock '{http://www.alfresco.org/model/system/1.0}activityfeedgenerator' using token '2fcea96a-0c93-43bd-81df-41f70e62a569'.  The lock has expired and been taken by another process.
   at org.alfresco.repo.domain.locks.AbstractLockDAOImpl.updateLocks(AbstractLockDAOImpl.java:218)
   at org.alfresco.repo.domain.locks.AbstractLockDAOImpl.releaseLock(AbstractLockDAOImpl.java:172)
   at org.alfresco.repo.lock.JobLockServiceImpl$3.execute(JobLockServiceImpl.java:428)
   at org.alfresco.repo.lock.JobLockServiceImpl$3.execute(JobLockServiceImpl.java:425)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:388)
   at org.alfresco.repo.lock.JobLockServiceImpl.releaseLock(JobLockServiceImpl.java:432)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator$LockTracker.releaseLock(AbstractFeedGenerator.java:241)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator.releaseLock(AbstractFeedGenerator.java:220)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator.execute(AbstractFeedGenerator.java:198)
   at org.alfresco.repo.activities.feed.FeedGeneratorJob.execute(FeedGeneratorJob.java:50)
   at org.quartz.core.JobRunShell.run(JobRunShell.java:216)
   … 1 more
2012-07-05 15:58:12,463  ERROR [quartz.core.ErrorLogger] [DefaultScheduler_Worker-9] Job (DEFAULT.feedGeneratorJobDetail threw an exception.
org.quartz.SchedulerException: Job threw an unhandled exception. [See nested exception: org.alfresco.repo.lock.LockAcquisitionException: 06050019 Failed to release lock '{http://www.alfresco.org/model/system/1.0}activityfeedgenerator' using token '2fcea96a-0c93-43bd-81df-41f70e62a569'.  The lock has expired and been taken by another process.]
   at org.quartz.core.JobRunShell.run(JobRunShell.java:227)
   at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:563)
Caused by: org.alfresco.repo.lock.LockAcquisitionException: 06050019 Failed to release lock '{http://www.alfresco.org/model/system/1.0}activityfeedgenerator' using token '2fcea96a-0c93-43bd-81df-41f70e62a569'.  The lock has expired and been taken by another process.
   at org.alfresco.repo.domain.locks.AbstractLockDAOImpl.updateLocks(AbstractLockDAOImpl.java:218)
   at org.alfresco.repo.domain.locks.AbstractLockDAOImpl.releaseLock(AbstractLockDAOImpl.java:172)
   at org.alfresco.repo.lock.JobLockServiceImpl$3.execute(JobLockServiceImpl.java:428)
   at org.alfresco.repo.lock.JobLockServiceImpl$3.execute(JobLockServiceImpl.java:425)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:388)
   at org.alfresco.repo.lock.JobLockServiceImpl.releaseLock(JobLockServiceImpl.java:432)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator$LockTracker.releaseLock(AbstractFeedGenerator.java:241)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator.releaseLock(AbstractFeedGenerator.java:220)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator.execute(AbstractFeedGenerator.java:198)
   at org.alfresco.repo.activities.feed.FeedGeneratorJob.execute(FeedGeneratorJob.java:50)
   at org.quartz.core.JobRunShell.run(JobRunShell.java:216)
   … 1 more
2012-07-05 15:58:12,984  ERROR [quartz.core.JobRunShell] [DefaultScheduler_Worker-7] Job DEFAULT.feedGeneratorJobDetail threw an unhandled Exception:
org.alfresco.repo.lock.LockAcquisitionException: 06050030 Failed to release lock '{http://www.alfresco.org/model/system/1.0}activityfeedgenerator' using token '2fcea96a-0c93-43bd-81df-41f70e62a569'.  The lock has expired and been taken by another process.
   at org.alfresco.repo.domain.locks.AbstractLockDAOImpl.updateLocks(AbstractLockDAOImpl.java:218)
   at org.alfresco.repo.domain.locks.AbstractLockDAOImpl.releaseLock(AbstractLockDAOImpl.java:172)
   at org.alfresco.repo.lock.JobLockServiceImpl$3.execute(JobLockServiceImpl.java:428)
   at org.alfresco.repo.lock.JobLockServiceImpl$3.execute(JobLockServiceImpl.java:425)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:388)
   at org.alfresco.repo.lock.JobLockServiceImpl.releaseLock(JobLockServiceImpl.java:432)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator$LockTracker.releaseLock(AbstractFeedGenerator.java:241)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator.releaseLock(AbstractFeedGenerator.java:220)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator.execute(AbstractFeedGenerator.java:198)
   at org.alfresco.repo.activities.feed.FeedGeneratorJob.execute(FeedGeneratorJob.java:50)
   at org.quartz.core.JobRunShell.run(JobRunShell.java:216)
   at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:563)
2012-07-05 15:58:12,984  ERROR [quartz.core.ErrorLogger] [DefaultScheduler_Worker-7] Job (DEFAULT.feedGeneratorJobDetail threw an exception.
org.quartz.SchedulerException: Job threw an unhandled exception. [See nested exception: org.alfresco.repo.lock.LockAcquisitionException: 06050030 Failed to release lock '{http://www.alfresco.org/model/system/1.0}activityfeedgenerator' using token '2fcea96a-0c93-43bd-81df-41f70e62a569'.  The lock has expired and been taken by another process.]
   at org.quartz.core.JobRunShell.run(JobRunShell.java:227)
   at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:563)
Caused by: org.alfresco.repo.lock.LockAcquisitionException: 06050030 Failed to release lock '{http://www.alfresco.org/model/system/1.0}activityfeedgenerator' using token '2fcea96a-0c93-43bd-81df-41f70e62a569'.  The lock has expired and been taken by another process.
   at org.alfresco.repo.domain.locks.AbstractLockDAOImpl.updateLocks(AbstractLockDAOImpl.java:218)
   at org.alfresco.repo.domain.locks.AbstractLockDAOImpl.releaseLock(AbstractLockDAOImpl.java:172)
   at org.alfresco.repo.lock.JobLockServiceImpl$3.execute(JobLockServiceImpl.java:428)
   at org.alfresco.repo.lock.JobLockServiceImpl$3.execute(JobLockServiceImpl.java:425)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:388)
   at org.alfresco.repo.lock.JobLockServiceImpl.releaseLock(JobLockServiceImpl.java:432)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator$LockTracker.releaseLock(AbstractFeedGenerator.java:241)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator.releaseLock(AbstractFeedGenerator.java:220)
   at org.alfresco.repo.activities.feed.AbstractFeedGenerator.execute(AbstractFeedGenerator.java:198)
   at org.alfresco.repo.activities.feed.FeedGeneratorJob.execute(FeedGeneratorJob.java:50)
   at org.quartz.core.JobRunShell.run(JobRunShell.java:216)
   … 1 more

Also, when watching it on Task Manager, it never exceeds 960mb.

What should I do?

Allocate more memory to it?

This error always happens when I try to overwrite a file, i.e. upload a new file version to alfresco.

Outcomes