The two stores are similar in that they both utilize an index to track the
location and state of messages written into a Journal. The differences lay
in the way in which the index is implemented among other things. LevelDB is
a slightly faster index than KahaDB and can provide somewhat better
performance numbers. In later releases of ActiveMQ the LevelDB store also
supports replication.
Given that you are on an older release where the LevelDB store
implementation was still very young I'd recommend sticking with KahaDB as it
is much more mature and has many of the early bugs worked out. The LevelDB
store in 5.8 is not really production-ready and will probably cause you some
trouble. You can move to the newest release v5.10 and LevelDB will be much
more robust.
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