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Cap the number of in-flight queries on a single shared TCP dispatch. When the limit is reached, the dispatch is removed from the hash table so subsequent queries get a fresh connection. The existing dispatch continues serving its queries until they complete. This bounds the blast radius of a connection drop: at most N queries fail simultaneously instead of all queries to that server. The default limit is 256. It can be overridden for testing via 'named -T tcppipelining=N'. |
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