keith-turner edited a comment on issue #2013:
URL: https://github.com/apache/accumulo/issues/2013#issuecomment-818112876
I think tablet servers should not delete the external compaction final state
markers when they do not know about the external compaction. They should only
delete these markers when they are hosting the tablet related to the compaction
and the tablet knows about the compaction.
For final state markers that reference external compactions that no longer
exists or tablets that no longer exist, the coordinator could periodically look
for these and clean them up. This periodic detection would be similar to what
the dead compaction detection is currently doing, but would be looking for the
inverse. The periodic algorithm could do the following.
1. Scan the final states markers in metadata table (~ecomp section) and
store them in a set w/ UUID (compaction id) as key.
2. Scan the metadata tablets section looking for compactions tablets think
are running and remove them from the set.
3. Delete any final state markers in the set since these reference tablets
and/or external compactions that no longer exists.
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