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7a6e3c1a73
When a server goes into maintenance, or if its IP address is changed, idle connections attached to it are scheduled for deletion via the purge mechanism. Connections are moved from server idle/safe list to the purge list relative to their thread. Connections are freed on their owned thread by the scheduled purge task. This patch extends this procedure to also handle private idle connections stored in sessions instead of servers. This is possible thanks via <sess_conns> list server member. A call to the newly defined-function session_purge_conns() is performed on each list element. This moves private connections from their session to the purge list alongside other server idle connections. This change relies on the serie of previous commits which ensure that access to private idle connections is now thread-safe, with idle_conns lock usage and careful manipulation of private idle conns in input/output handlers. The main benefit of this patch is that now all idle connections targetting a server set in maintenance are removed. Previously, private connections would remain until their attach sessions were closed. |
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