On 22/12/2008, at 5:14 PM, Antony Blakey wrote:
I now know that this is wrong, sorry. Document deletions are never
'lost', and hence there's no need to track compaction generations.
That raises a very different issue I noted in 'History of deletion,
and the interaction with compactions' on couchdb-dev, but it's
nothing to do with _external.
Hmmm. Further digging reveals that the purge function will in fact
remove the record of deletions. Luckily there's a purge_seq value
supplied in the dbinfo result (and also in each _external call). By
tracking this, an _external knows when to revalidate it's documents.
Purging can break replication, especially in distributed systems
without centralized knowledge or control of replication status (which
is my situation).
Antony Blakey
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