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c21a187ec0
In order to evenly pick idle connections from other threads, there is a "next_takeover" index in the server, that is incremented each time a connection is picked from another thread, and indicates which one to start from next time. With thread groups this doesn't work well because the index is the same regardless of the group, and if a group has more threads than another, there's even a risk to reintroduce an imbalance. This patch introduces a new per-tgroup storage in servers which, for now, only contains an instance of this next_takeover index. This way each thread will now only manipulate the index specific to its own group, and the takeover will become fair again. More entries may come soon.