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Kirill Solomko e5d7232b63 MT#64891 enhance Redis connection handling ... * Catalyst::Plugin::NGCP::Redis changes - new function _connect_and_cache() that now contains the migrated connect & cache code returns the connection reference - new function _get_replication_role() that sends "INFO replication" command to the server and returns the role string back - new function _wait_for_master_role() that tries to wait 5 seconds for the server to return the 'master' role, with 1 second attempt intervals - rework redis_get_connection to obtain the connection inside try/catch and use _wait_for_master_role() after reconnect, as well as using it for the 'heartbeat' part to test dead connections instead of PING (so 1 command is sent in the end instead of 2). * With the redis_get_connection rework not only does it perform an automatic reconnect attempt if it detects a dead connection but it also waits until the server is 'master', which might happen during the db node switchovers, so API requests that happen during the switchover do not end up with errors "READ ONLY ROLE", and unless there is something persistently wrong on the server side, the reconnections/swithovers should be transparent now for the clients, with only probabaly 1-2 second delays on select API requests while the server is becoming the new 'master'. Change-Id: I41bf1f55a07b56e4fceef243f09f316694d62a39		5 days ago
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Plugin/NGCP	MT#64891 enhance Redis connection handling	5 days ago