• Kevin Chen's avatar
    Remove setting rdataset->ttl to 0. When it is set to 0, stale records · da9fcfea
    Kevin Chen authored
    in "rndc dumpdb" output show 0 TTLs.
    
    Add rbtdb->serve_stale_ttl to various checks so that stale records are
    not purged from the cache when they've been stale for RBTDB_VIRTUAL
    (300) seconds.
    
    Increment ns_statscounter_usedstale when a stale answer is used.
    
    There's a question of whether overmem_purge should be purging ancient
    records, instead of stale ones.  I've left it as purging stale
    records, since stale records could take up the majority of the cache.
    da9fcfea
query.c 299 KB