It would be good to have the default configuration to use shared-file-locker with lockKeepAlivePeriod and lockAcquireSleepInterval in A-MQ 6.3

<persistenceAdapter>
    <kahaDB directory="/mnt/nfs/fuse-shared/kahadb" lockKeepAlivePeriod="2000">
        <locker>
            <shared-file-locker lockAcquireSleepInterval="10000"/>
        </locker>
    </kahaDB>
</persistenceAdapter>

Most customers already tend to use that configuration to ensure any network issues connecting to the store/lock are detected.