A-MQ: Incorrect logging from KahaDB cleanup task when enableAckCompaction=true

Using Karaf shell JMS producer and consumer to reproduce the problem. Run an AMQ 6.3 broker with this KahaDB configuration <kahaDB directory= "${data}/kahadb" journalMaxFileLength= "32mb" concurrentStoreAndDispatchQueues= " false " checksumJournalFiles= " false " indexCacheSize= "100000" indexWriteBatchSize= "10000" preallocationStrategy= "os_kernel_copy" enableJournalDiskSyncs= " false " enableAckCompaction= " true " compactAcksIgnoresStoreGrowth= " true " ignoreMissingJournalfiles= " true " compactAcksAfterNoGC= "2" /> Configure detailed KahaDB logging: # kahaDB Messsage Database appender log4j.appender.kahadb=org.apache.log4j.RollingFileAppender log4j.appender.kahadb.file=${karaf.data}/log/kahadb.log log4j.appender.kahadb.maxFileSize=1024KB log4j.appender.kahadb.maxBackupIndex=5 log4j.appender.kahadb.append= true log4j.appender.kahadb.layout=org.apache.log4j.PatternLayout log4j.appender.kahadb.layout.ConversionPattern=%d [%-15.15t] %-5p %-30.30c{1} - %m%n log4j.logger.org.apache.activemq.store.kahadb.MessageDatabase=TRACE, kahadb Start AMQ and two Karaf shells. Also tail data/log/kahadb.log First run activemq:producer --user admin --password admin --destination queue: //TEST.1 --messageCount 1 --persistent true to send a single msg to queue TEST.1. Then in two Karaf shells execute these commands in parallel activemq:producer --user admin --password admin --destination queue: //TEST.2 --messageCount 30000 --textMessageSize 2048000 --persistent true activemq:consumer --user admin --password admin --destination queue: //TEST.2 --messageCount 30000 and wait for commands to finish and ack compaction to occur, i.e. to log TRACE MessageDatabase - ACKS forwarded, updates for ack locations: {11=[1, 2]} TRACE MessageDatabase - ACK File Map following updates: {3=[2, 3], 4=[3, 4], 5=[4, 5], 6=[5, 6], 7=[6, 7], 10=[10], 11=[1, 2]} In my test the ack compaction creates file 1.7M Jun 6 12:29 db-11.log Note: The file size is only 1.7M, not 32M as with usual journal files, indicating this is an ack compacted journal. db-11.log is also the currently latest journal file! Then run activemq:consumer --user admin --password admin --destination queue: //TEST.1 --messageCount 1 to consume the only remaining msg and wait for KahaDB clean up task to be run again. It should log DEBUG MessageDatabase - Cleanup removing the data files: [1, 2, 3, 4, 5, 6, 7, 11] where it says it removes journal db-11.log which in fact is not deleted!