> Scenario: > S0 - Running Postgresql as primary, and also PgPool. > S1 - Running Postgresql as secondary, and also PgPool. > S2 - Running only PgPool. Has the VIP. > > There's no /need/ for Postgresql or PgPool on server 0 to shut down if > it loses contact with S1 and S2, since they'll also notice that that > S1 has disappeared. In that case, they'll vote S1 into degraded > state, and promote S1 to be the Postgresql primary. > > A good question is what happens when S0 and S1 lose connection to S2 > (meaning that S2 loses connection to them, too). S0 and S1 then > "should" vote that S0 take over the VIP. But, if S2 is still up and > can connect to "the world", does it voluntarily decide to give up the > VIP since it's all alone? Yes, because S2 pgpool is not the leader anymore. In this case S2 voluntarily gives up VIP. Best reagards, -- Tatsuo Ishii SRA OSS LLC English: http://www.sraoss.co.jp/index_en/ Japanese:http://www.sraoss.co.jp
