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https://issues.apache.org/jira/browse/AMQ-5695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15004689#comment-15004689
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Lukáš Brožovský commented on AMQ-5695:
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We experience this in production all the time. During heavy load there's always 
some messages without ACK when rolling journal log to a new file and therefore 
the old journal log is never deleted - instead infinite chain of log files just 
keeps on growing. Assuming for example the case that there's single undelivered 
message in the first one (e.g. DLQ). So because of this single msg and heavy 
load nothing gets deleted.

> KahaDB not cleaning up log files
> --------------------------------
>
>                 Key: AMQ-5695
>                 URL: https://issues.apache.org/jira/browse/AMQ-5695
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 5.11.1
>            Reporter: Stefan Warten
>            Priority: Blocker
>
> Since we have upgraded ActiveMQ from 5.10.0 to 5.11.1, KahaDB is not cleaning 
> up log files properly. It seems to keep all of them. It helped once to 
> restart the service and minutes later, ActiveMQ cleaned up 95% of log files 
> but mostly it is not cleaning up at all.
> When partition was full, I stopped ActiveMQ, copied the KahaDB to another 
> host and started it with empty queues again. Then I forwarded all messages 
> from that other host back. Even when all messages were forwarded and all 
> queues were empty, the old KahaDB log files were not cleaned up.
> I stopped ActiveMQ, removed db.data and db.redo to rebuild index which took 
> around 3h (350GB of log files) but still, the log files are not cleaned up.
> [...]
> 2015-03-30 18:21:55,532 | INFO  | @13786:158508, 321300000 entries recovered 
> .. | org.apache.activemq.store.kahadb.MessageDatabase | WrapperSimpleAppMain
> 2015-03-30 18:22:02,090 | INFO  | Recovery replayed 321378917 operations from 
> the journal in 9226.159 seconds. | 
> org.apache.activemq.store.kahadb.MessageDatabase | WrapperSimpleAppMain
> 2015-03-30 18:22:02,402 | INFO  | installing runtimeConfiguration plugin | 
> org.apache.activemq.plugin.RuntimeConfigurationPlugin | WrapperSimpleAppMain
> 2015-03-30 18:22:04,576 | INFO  | Apache ActiveMQ 5.11.1 
> (prd-mig-02-sat.example.com, 
> ID:prd-mig-02-sat.example.com-26260-1427730492201-1:1) is starting | 
> org.apache.activemq.broker.BrokerService | WrapperSimpleAppMain
> 2015-03-30 18:22:04,946 | INFO  | pending local transactions: [] | 
> org.apache.activemq.store.kahadb.MultiKahaDBTransactionStore | 
> WrapperSimpleAppMain
> 2015-03-30 18:22:08,488 | INFO  | Configuration class path resource 
> [activemq.xml] | org.apache.activemq.plugin.RuntimeConfigurationBroker | 
> WrapperSimpleAppMain
> 2015-03-30 18:22:12,198 | INFO  | Listening for connections at: 
> nio://prd-mig-02-sat.example.com:61616?transport.reuseAddress=true | 
> org.apache.activemq.transport.TransportServerThreadSupport | 
> WrapperSimpleAppMain
> 2015-03-30 18:22:12,199 | INFO  | Connector openwire started | 
> org.apache.activemq.broker.TransportConnector | WrapperSimpleAppMain
> 2015-03-30 18:22:12,232 | INFO  | Listening for connections at: 
> stomp+nio://prd-mig-02-sat.example.com:61613?transport.closeAsync=false&transport.reuseAddress=true
>  | org.apache.activemq.transport.TransportServerThreadSupport | 
> WrapperSimpleAppMain
> 2015-03-30 18:22:12,234 | INFO  | Connector stomp started | 
> org.apache.activemq.broker.TransportConnector | WrapperSimpleAppMain
> 2015-03-30 18:22:12,237 | INFO  | Establishing network connection from 
> vm://prd-mig-02-sat.example.com?async=false&network=true to 
> tcp://172.42.15.40:61616 | 
> org.apache.activemq.network.DiscoveryNetworkConnector | WrapperSimpleAppMain
> 2015-03-30 18:22:12,286 | INFO  | Connector vm://prd-mig-02-sat.example.com 
> started | org.apache.activemq.broker.TransportConnector | WrapperSimpleAppMain
> 2015-03-30 18:22:12,318 | INFO  | Establishing network connection from 
> vm://prd-mig-02-sat.example.com?async=false&network=true to 
> tcp://172.42.15.39:61616 | 
> org.apache.activemq.network.DiscoveryNetworkConnector | WrapperSimpleAppMain
> 2015-03-30 18:22:12,321 | INFO  | Network Connector 
> DiscoveryNetworkConnector:FORWARDER:BrokerService[prd-mig-02-sat.example.com] 
> started | org.apache.activemq.network.NetworkConnector | WrapperSimpleAppMain
> 2015-03-30 18:22:12,325 | INFO  | Apache ActiveMQ 5.11.1 
> (prd-mig-02-sat.example.com, 
> ID:prd-mig-02-sat.example.com-26260-1427730492201-1:1) started | 
> org.apache.activemq.broker.BrokerService | WrapperSimpleAppMain
> 2015-03-30 18:22:12,326 | INFO  | For help or more information please see: 
> http://activemq.apache.org | org.apache.activemq.broker.BrokerService | 
> WrapperSimpleAppMain
> 2015-03-30 18:22:12,381 | INFO  | Network connection between 
> vm://prd-mig-02-sat.example.com#0 and tcp:///172.42.15.40:61616@58567 
> (prdvip-amq-01-sat.example.com) has been established. | 
> org.apache.activemq.network.DemandForwardingBridgeSupport | 
> triggerStartAsyncNetworkBridgeCreation: 
> remoteBroker=tcp:///172.42.15.40:61616@58567, localBroker= 
> vm://prd-mig-02-sat.example.com#0
> 2015-03-30 18:22:12,381 | INFO  | Network connection between 
> vm://prd-mig-02-sat.example.com#2 and tcp:///172.42.15.39:61616@4523 
> (prdvip-amq-02-sat.example.com) has been established. | 
> org.apache.activemq.network.DemandForwardingBridgeSupport | 
> triggerStartAsyncNetworkBridgeCreation: 
> remoteBroker=tcp:///172.42.15.39:61616@4523, localBroker= 
> vm://prd-mig-02-sat.example.com#2
> 2015-03-31 04:21:13,971 | INFO  | Slow KahaDB access: Journal append took: 0 
> ms, Index update took 1936 ms | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | JobScheduler:JMS
> 2015-03-31 06:07:34,560 | INFO  | Slow KahaDB access: cleanup took 30113 | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | ActiveMQ Journal 
> Checkpoint Worker
> 2015-03-31 06:07:39,076 | INFO  | Slow KahaDB access: cleanup took 4015 | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | ActiveMQ Journal 
> Checkpoint Worker
> 2015-03-31 06:08:48,101 | INFO  | Slow KahaDB access: Journal append took: 0 
> ms, Index update took 2667 ms | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | JobScheduler:JMS
> 2015-03-31 06:09:39,629 | INFO  | Slow KahaDB access: cleanup took 3470 | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | ActiveMQ Journal 
> Checkpoint Worker
> 2015-03-31 06:10:20,789 | INFO  | Slow KahaDB access: Journal append took: 0 
> ms, Index update took 2666 ms | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | JobScheduler:JMS
> 2015-03-31 06:11:02,925 | INFO  | Slow KahaDB access: Journal append took: 1 
> ms, Index update took 2714 ms | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | JobScheduler:JMS
> 2015-03-31 06:11:23,673 | INFO  | Slow KahaDB access: Journal append took: 1 
> ms, Index update took 2632 ms | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | JobScheduler:JMS
> 2015-03-31 06:11:53,784 | INFO  | Slow KahaDB access: Journal append took: 1 
> ms, Index update took 2736 ms | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | JobScheduler:JMS
> 2015-03-31 06:12:19,786 | INFO  | Slow KahaDB access: Journal append took: 0 
> ms, Index update took 2663 ms | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | JobScheduler:JMS
> 2015-03-31 06:13:08,826 | INFO  | Slow KahaDB access: Journal append took: 1 
> ms, Index update took 2770 ms | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | JobScheduler:JMS
> 2015-03-31 06:13:32,862 | INFO  | Slow KahaDB access: Journal append took: 1 
> ms, Index update took 2819 ms | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | JobScheduler:JMS
> 2015-03-31 06:14:08,931 | INFO  | Slow KahaDB access: Journal append took: 0 
> ms, Index update took 2885 ms | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | JobScheduler:JMS
> 2015-03-31 06:14:42,495 | INFO  | Slow KahaDB access: cleanup took 3480 | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | ActiveMQ Journal 
> Checkpoint Worker
> 2015-03-31 06:16:13,040 | INFO  | Slow KahaDB access: cleanup took 3341 | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | ActiveMQ Journal 
> Checkpoint Worker
> 2015-03-31 06:16:43,920 | INFO  | Slow KahaDB access: cleanup took 3760 | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | ActiveMQ Journal 
> Checkpoint Worker
> 2015-03-31 06:17:14,221 | INFO  | Slow KahaDB access: cleanup took 3717 | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | ActiveMQ Journal 
> Checkpoint Worker
> 2015-03-31 06:17:44,498 | INFO  | Slow KahaDB access: cleanup took 3722 | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | ActiveMQ Journal 
> Checkpoint Worker
> 2015-03-31 06:18:20,988 | INFO  | Slow KahaDB access: Journal append took: 1 
> ms, Index update took 2971 ms | 
> org.apache.activemq.store.kahadb.AbstractKahaDBStore | JobScheduler:JMS



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