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Multiple concurrent writers would cause the HDB to become corrupted as the locking was not sufficient to prevent these sorts of issues from occurring. We have changed the locking to obtain the appropriate kind of lock on database open and to hold that lock until the database closes. We need to do this as Berkeley DB 1.85 will cache information from the database in memory and if if this information is updated without our knowledge then our later writes will corrupt the database. We speculate that there would be issues with a single writer and reader but did not reproduce them.
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