cowtowncoder/eventtracker — comment on commit 7e0cf95061dde2e7987607e0c86dbdd09118ed64
File: http/src/main/java/com/ning/metrics/eventtracker/HttpSender.java line 182
By cowtowncoder:

It requests server side to close the connection after processing request, sending response. Since server physically closes the connection, it can not be reused. And yes, it'll take a while, depending on time value we use: with 2 minute setting, up to 2 minutes to shuffle all connections. But I think that is ok actually, since the newly restarted server will get bit of time to "warm up", as it starts getting more requests.