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https://issues.apache.org/jira/browse/AMQ-2891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13166111#comment-13166111
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Gary Tully commented on AMQ-2891:
---------------------------------

@Raghav How do you stop the broker? If the broker does not do a clean shutdown 
it will initiate recovery on restart which involves replaying the journal from 
the last checkpoint which can be slow with large volumes. This should be the 
exception (jvm abort) and not the norm. 

                
> ActiveMQ takes longer to start with KahaDb and more than 10000 messages
> -----------------------------------------------------------------------
>
>                 Key: AMQ-2891
>                 URL: https://issues.apache.org/jira/browse/AMQ-2891
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.4.0
>         Environment: Windows XP
>            Reporter: Dinny Mathew
>            Assignee: Gary Tully
>
> ActiveMQ takes around five minutes to start with KahaDb with more than 10000 
> messages. All messages are persistent queue. 
> With 500,000 persistent messsages, ittook around 20 minutes to start.
> See the five minutes time difference between lines:
> 2010-08-31 12:55:19,286 | INFO | 
> PListStore:C:\ActiveMQ\apache-activemq-5.4.0\bin\win32\..\..\data\localhost\tmp_storage
>  initialized | org.apache.activemq.store.kahadb.plist.PListStore | 
> WrapperSimpleAppMain
> 2010-08-31 13:03:56,983 | INFO | Listening for connections at: 
> nio://S90356004630988:61616 | 
> org.apache.activemq.transport.TransportServerThreadSupport | 
> WrapperSimpleAppMain
> From activemq.log with 100,000 messages
> 2010-08-31 12:55:10,436 | INFO | JMX consoles can connect to 
> service:jmx:rmi:///jndi/rmi://localhost:1099/jmxrmi | 
> org.apache.activemq.broker.jmx.ManagementContext | JMX connector
> 2010-08-31 12:55:11,294 | INFO | KahaDB is version 2 | 
> org.apache.activemq.store.kahadb.MessageDatabase | WrapperSimpleAppMain
> 2010-08-31 12:55:11,435 | INFO | Recovering from the journal ... | 
> org.apache.activemq.store.kahadb.MessageDatabase | WrapperSimpleAppMain
> 2010-08-31 12:55:11,435 | INFO | Recovery replayed 1 operations from the 
> journal in 0.063 seconds. | org.apache.activemq.store.kahadb.MessageDatabase 
> | WrapperSimpleAppMain
> 2010-08-31 12:55:12,090 | INFO | ActiveMQ 5.4.0 JMS Message Broker 
> (localhost) is starting | org.apache.activemq.broker.BrokerService | 
> WrapperSimpleAppMain
> 2010-08-31 12:55:12,090 | INFO | For help or more information please see: 
> http://activemq.apache.org/ | org.apache.activemq.broker.BrokerService | 
> WrapperSimpleAppMain
> 2010-08-31 12:55:12,278 | INFO | Scheduler using directory: 
> activemq-data\scheduler | 
> org.apache.activemq.broker.scheduler.SchedulerBroker | WrapperSimpleAppMain
> 2010-08-31 12:55:19,286 | INFO | 
> PListStore:C:\ActiveMQ\apache-activemq-5.4.0\bin\win32\..\..\data\localhost\tmp_storage
>  initialized | org.apache.activemq.store.kahadb.plist.PListStore | 
> WrapperSimpleAppMain
> 2010-08-31 13:03:56,983 | INFO | Listening for connections at: 
> nio://S90356004630988:61616 | 
> org.apache.activemq.transport.TransportServerThreadSupport | 
> WrapperSimpleAppMain
> 2010-08-31 13:03:56,999 | INFO | Connector nio Started | 
> org.apache.activemq.broker.TransportConnector | WrapperSimpleAppMain
> 2010-08-31 13:03:57,045 | INFO | ActiveMQ JMS Message Broker (localhost, 
> ID:S90356004630988-3777-1283273712137-0:0) started | 
> org.apache.activemq.broker.BrokerService | WrapperSimpleAppMain
> 2010-08-31 13:03:57,639 | INFO | Logging to 
> org.slf4j.impl.JCLLoggerAdapter(org.eclipse.jetty.util.log) via 
> org.eclipse.jetty.util.log.Slf4jLog | org.eclipse.jetty.util.log | 
> WrapperSimpleAppMain
> 2010-08-31 13:03:57,639 | INFO | jetty-7.0.1.v20091125 | 
> org.eclipse.jetty.util.log | WrapperSimpleAppMain
> 2010-08-31 13:03:58,451 | INFO | ActiveMQ WebConsole initialized. | 
> org.apache.activemq.web.WebConsoleStarter | WrapperSimpleAppMain
> 2010-08-31 13:03:58,857 | INFO | Initializing Spring FrameworkServlet 
> 'dispatcher' | /admin | WrapperSimpleAppMain
> 2010-08-31 13:03:59,341 | INFO | ActiveMQ Console at 
> http://0.0.0.0:8161/admin | org.eclipse.jetty.util.log | WrapperSimpleAppMain
> 2010-08-31 13:04:00,091 | INFO | Initializing Spring root 
> WebApplicationContext | /camel | WrapperSimpleAppMain
> 2010-08-31 13:04:02,668 | INFO | Connector vm://localhost Started | 
> org.apache.activemq.broker.TransportConnector | WrapperSimpleAppMain
> 2010-08-31 13:04:04,526 | INFO | Camel Console at http://0.0.0.0:8161/camel | 
> org.eclipse.jetty.util.log | WrapperSimpleAppMain
> 2010-08-31 13:04:04,589 | INFO | ActiveMQ Web Demos at 
> http://0.0.0.0:8161/demo | org.eclipse.jetty.util.log | WrapperSimpleAppMain
> 2010-08-31 13:04:04,651 | INFO | RESTful file access application at 
> http://0.0.0.0:8161/fileserver | org.eclipse.jetty.util.log | 
> WrapperSimpleAppMain
> 2010-08-31 13:04:04,698 | INFO | Started [email protected]:8161 
> | org.eclipse.jetty.util.log | WrapperSimpleAppMain
> 2
> With 500,000 messages, AMQ took 20 minutes to start.
> 2010-08-31 15:24:31,178 | INFO  | JMX consoles can connect to 
> service:jmx:rmi:///jndi/rmi://localhost:1099/jmxrmi | 
> org.apache.activemq.broker.jmx.ManagementContext | JMX connector
> 2010-08-31 15:24:31,975 | INFO  | KahaDB is version 2 | 
> org.apache.activemq.store.kahadb.MessageDatabase | WrapperSimpleAppMain
> 2010-08-31 15:24:32,194 | INFO  | Recovering from the journal ... | 
> org.apache.activemq.store.kahadb.MessageDatabase | WrapperSimpleAppMain
> 2010-08-31 15:24:32,194 | INFO  | Recovery replayed 1 operations from the 
> journal in 0.047 seconds. | org.apache.activemq.store.kahadb.MessageDatabase 
> | WrapperSimpleAppMain
> 2010-08-31 15:24:35,365 | INFO  | ActiveMQ 5.4.0 JMS Message Broker 
> (localhost) is starting | org.apache.activemq.broker.BrokerService | 
> WrapperSimpleAppMain
> 2010-08-31 15:24:35,365 | INFO  | For help or more information please see: 
> http://activemq.apache.org/ | org.apache.activemq.broker.BrokerService | 
> WrapperSimpleAppMain
> 2010-08-31 15:24:35,552 | INFO  | Scheduler using directory: 
> activemq-data\scheduler | 
> org.apache.activemq.broker.scheduler.SchedulerBroker | WrapperSimpleAppMain
> 2010-08-31 15:24:48,034 | INFO  | 
> PListStore:C:\ActiveMQ\apache-activemq-5.4.0\bin\win32\..\..\data\localhost\tmp_storage
>  initialized | org.apache.activemq.store.kahadb.plist.PListStore | 
> WrapperSimpleAppMain
> 2010-08-31 15:45:09,767 | INFO  | Listening for connections at: 
> nio://S90356004630988:61616 | 
> org.apache.activemq.transport.TransportServerThreadSupport | 
> WrapperSimpleAppMain
> 2010-08-31 15:45:09,767 | INFO  | Connector nio Started | 
> org.apache.activemq.broker.TransportConnector | WrapperSimpleAppMain
> 2010-08-31 15:45:09,876 | INFO  | ActiveMQ JMS Message Broker (localhost, 
> ID:S90356004630988-3029-1283282675427-0:0) started | 
> org.apache.activemq.broker.BrokerService | WrapperSimpleAppMain
> 2010-08-31 15:45:10,923 | INFO  | Logging to 
> org.slf4j.impl.JCLLoggerAdapter(org.eclipse.jetty.util.log) via 
> org.eclipse.jetty.util.log.Slf4jLog | org.eclipse.jetty.util.log | 
> WrapperSimpleAppMain
> 2010-08-31 15:45:10,923 | INFO  | jetty-7.0.1.v20091125 | 
> org.eclipse.jetty.util.log | WrapperSimpleAppMain
> 2010-08-31 15:45:10,970 | INFO  | Slow KahaDB access: cleanup took 1047 | 
> org.apache.activemq.store.kahadb.MessageDatabase | ActiveMQ Journal 
> Checkpoint Worker
> 2010-08-31 15:45:11,829 | INFO  | ActiveMQ WebConsole initialized. | 
> org.apache.activemq.web.WebConsoleStarter | WrapperSimpleAppMain
> 2010-08-31 15:45:12,235 | INFO  | Initializing Spring FrameworkServlet 
> 'dispatcher' | /admin | WrapperSimpleAppMain
> 2010-08-31 15:45:12,719 | INFO  | ActiveMQ Console at 
> http://0.0.0.0:8161/admin | org.eclipse.jetty.util.log | WrapperSimpleAppMain
> 2010-08-31 15:45:13,422 | INFO  | Initializing Spring root 
> WebApplicationContext | /camel | WrapperSimpleAppMain
> 2010-08-31 15:45:16,390 | INFO  | Connector vm://localhost Started | 
> org.apache.activemq.broker.TransportConnector | WrapperSimpleAppMain
> 2010-08-31 15:45:18,468 | INFO  | Camel Console at http://0.0.0.0:8161/camel 
> | org.eclipse.jetty.util.log | WrapperSimpleAppMain
> 2010-08-31 15:45:18,561 | INFO  | ActiveMQ Web Demos at 
> http://0.0.0.0:8161/demo | org.eclipse.jetty.util.log | WrapperSimpleAppMain
> 2010-08-31 15:45:18,624 | INFO  | RESTful file access application at 
> http://0.0.0.0:8161/fileserver | org.eclipse.jetty.util.log | 
> WrapperSimpleAppMain
> 2010-08-31 15:45:18,686 | INFO  | Started [email protected]:8161 
> | org.eclipse.jetty.util.log | WrapperSimpleAppMain
> Here is the config:
>     <broker xmlns="http://activemq.apache.org/schema/core"; 
> brokerName="localhost" dataDirectory="${activemq.base}/data" 
> persistent="true" systemExitOnShutdown="true" useShutdownHook="false" 
> advisorySupport="false" useJmx="true">
>  
>         <!--
>                       For better performances use VM cursor and small memory 
> limit.
>                       For more information, see:
>             
>             http://activemq.apache.org/message-cursors.html
>             
>             Also, if your producer is "hanging", it's probably due to 
> producer flow control.
>             For more information, see:
>             http://activemq.apache.org/producer-flow-control.html
>         -->
>               
>         <destinationPolicy>
>             <policyMap>
>               <policyEntries>
>                 <policyEntry topic=">" producerFlowControl="false" 
> optimizedDispatch="true" memoryLimit="128mb">
>                   <pendingSubscriberPolicy>
>                     <fileCursor />
>                   </pendingSubscriberPolicy>
>                 </policyEntry>
>                 <policyEntry queue=">" producerFlowControl="false" 
> optimizedDispatch="true" memoryLimit="128mb">
>                   <!-- Use VM cursor for better latency
>                        For more information, see:
>                        
>                        http://activemq.apache.org/message-cursors.html
>                    -->    
>                   <pendingQueuePolicy>
>                     <fileQueueCursor/>
>                   </pendingQueuePolicy>
>                   
>                 </policyEntry>
>               </policyEntries>
>             </policyMap>
>         </destinationPolicy> 
>  
>         
>         <!-- 
>             The managementContext is used to configure how ActiveMQ is 
> exposed in 
>             JMX. By default, ActiveMQ uses the MBean server that is started 
> by 
>             the JVM. For more information, see: 
>             
>             http://activemq.apache.org/jmx.html 
>         -->
>         <managementContext>
>             <managementContext createConnector="true"/>
>         </managementContext>
>         <!-- 
>             Configure message persistence for the broker. The default 
> persistence
>             mechanism is the KahaDB store (identified by the kahaDB tag). 
>             For more information, see: 
>             
>             http://activemq.apache.org/persistence.html 
>         -->
>         <persistenceAdapter>
>             <kahaDB directory="${activemq.base}/data/kahadb" 
> enableIndexWriteAsync="true" journalMaxFileLength="64mb"  
> indexWriteBatchSize="10000" indexCacheSize="10000"/>
>         </persistenceAdapter>
>         
>         
>           <!--
>             The systemUsage controls the maximum amount of space the broker 
> will 
>             use before slowing down producers. For more information, see:
>             
>             http://activemq.apache.org/producer-flow-control.html
>              
>         <systemUsage>
>             <systemUsage>
>                 <memoryUsage>
>                     <memoryUsage limit="600 mb"/>
>                 </memoryUsage>
>                 <storeUsage>
>                     <storeUsage limit="10 gb"/>
>                 </storeUsage>
>                 <tempUsage>
>                     <tempUsage limit="1 gb"/>
>                 </tempUsage>
>             </systemUsage>
>         </systemUsage>
>               -->
>                 
>         <!-- 
>             The transport connectors expose ActiveMQ over a given protocol to
>             clients and other brokers. For more information, see: 
>             
>             http://activemq.apache.org/configuring-transports.html 
>         -->
>         <transportConnectors>
>             <transportConnector name="nio" uri="nio://0.0.0.0:61616"/>
>         </transportConnectors>
>     </broker>

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