Tim Bain created AMQ-5547:
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Summary: Provide a means to compact sparsely-populated KahaDB data
files
Key: AMQ-5547
URL: https://issues.apache.org/jira/browse/AMQ-5547
Project: ActiveMQ
Issue Type: Improvement
Components: Message Store
Reporter: Tim Bain
AMQ-5542 describes a bug in our handling of KahaDB files where most but not all
of the messages have been removed. In the comments, we describe a scenario
where many files could be kept simply because of a single message in an older
KahaDB file, because ack messages in file N+1 apply to messages in file N and
so N+1 must be kept as long as N is.
The problem exists because KahaDB data files can't be compacted, which is why
mKahaDB (multi-KahaDB) was developed. We should either use mKahaDB, or we
should find some other mechanism to ensure that unneeded data files aren't kept
around simply because a single old message is still alive.
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