接上一篇博客：http://www.cnblogs.com/xiaoit/p/4522218.html
Primary Secondary Arbiter 1：關閉順序PSA ：會報錯 2：關閉順序PAS ：可以 3：關閉順序SAP ：主節點會變為從節點 4：關閉順序SPA ：會報錯 5：關閉順序APS 6：關閉順序ASP ：主節點會變為從節點
1：關閉順序PSA
gechongrepl:PRIMARY> rs.isMaster()
{
"setName" : "gechongrepl",
"setVersion" : 13,
"ismaster" : true,
"secondary" : false,
"hosts" : [
"192.168.91.133:27017",
"192.168.91.132:27017",
"192.168.91.132:27018"
],
"arbiters" : [
"192.168.91.135:27017"
],
"primary" : "192.168.91.133:27017",
"me" : "192.168.91.133:27017",
"electionId" : ObjectId("5568098a6de3d53a2ea91c64"),
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"maxWriteBatchSize" : 1000,
"localTime" : ISODate("2015-05-29T06:39:36.548Z"),
"maxWireVersion" : 3,
"minWireVersion" : 0,
"ok" : 1
}
P：
gechongrepl:PRIMARY> use admin switched to db admin gechongrepl:PRIMARY> db.shutdownServer()
S:
從變為了：gechongrepl:PRIMARY>
gechongrepl:PRIMARY> use admin switched to db admin gechongrepl:PRIMARY> db.shutdownServer() assert failed : unexpected error: Error: shutdownServer failed: No electable secondaries caught up as of 2015-05-28T23:48:06.022-0700 Error: assert failed : unexpected error: Error: shutdownServer failed: No electable secondaries caught up as of 2015-05-28T23:48:06.022-0700 at Error (<anonymous>) at doassert (src/mongo/shell/assert.js:11:14) at assert (src/mongo/shell/assert.js:20:5) at DB.shutdownServer (src/mongo/shell/db.js:212:9) at (shell):1:4 2015-05-28T23:48:06.023-0700 E QUERY Error: assert failed : unexpected error: Error: shutdownServer failed: No electable secondaries caught up as of 2015-05-28T23:48:06.022-0700 at Error (<anonymous>) at doassert (src/mongo/shell/assert.js:11:14) at assert (src/mongo/shell/assert.js:20:5) at DB.shutdownServer (src/mongo/shell/db.js:212:9) at (shell):1:4 at src/mongo/shell/assert.js:13
A：
gechongrepl:ARBITER> use admin switched to db admin gechongrepl:ARBITER> db.shutdownServer()
再次關閉S：
S變為了：ggechongrepl:SECONDARY> gechongrepl:SECONDARY> use admin switched to db admin gechongrepl:SECONDARY> db.shutdownServer()
2：關閉順序PAS : 已經驗證，不報錯。
3：關閉順序SAP
S：
gechongrepl:SECONDARY> use admin switched to db admin gechongrepl:SECONDARY> db.shutdownServer()
A：
gechongrepl:ARBITER> use admin switched to db admin gechongrepl:ARBITER> db.shutdownServer()
P：
主變為了：gechongrepl:SECONDARY> gechongrepl:SECONDARY> use admin switched to db admin gechongrepl:SECONDARY> db.shutdownServer()
4：關閉順序SPA
S:
gechongrepl:SECONDARY> use admin switched to db admin gechongrepl:SECONDARY> db.shutdownServer()
P：
gechongrepl:PRIMARY> use admin
switched to db admin
gechongrepl:PRIMARY> db.shutdownServer()
assert failed : unexpected error: Error: shutdownServer failed: No electable secondaries caught up as of 2015-05-28T23:59:19.685-0700
Error: assert failed : unexpected error: Error: shutdownServer failed: No electable secondaries caught up as of 2015-05-28T23:59:19.685-0700
at Error (<anonymous>)
at doassert (src/mongo/shell/assert.js:11:14)
at assert (src/mongo/shell/assert.js:20:5)
at DB.shutdownServer (src/mongo/shell/db.js:212:9)
at (shell):1:4
2015-05-28T23:59:19.702-0700 E QUERY Error: assert failed : unexpected error: Error: shutdownServer failed: No electable secondaries caught up as of 2015-05-28T23:59:19.685-0700
at Error (<anonymous>)
at doassert (src/mongo/shell/assert.js:11:14)
at assert (src/mongo/shell/assert.js:20:5)
at DB.shutdownServer (src/mongo/shell/db.js:212:9)
at (shell):1:4 at src/mongo/shell/assert.js:13
A：
gechongrepl:ARBITER> use admin switched to db admin gechongrepl:ARBITER> db.shutdownServer()
再次關閉P：
gechongrepl:PRIMARY> use admin switched to db admin 2015-05-29T00:00:44.938-0700 I NETWORK DBClientCursor::init call() failed 2015-05-29T00:00:44.940-0700 I NETWORK trying reconnect to 127.0.0.1:27017 (127.0.0.1) failed 2015-05-29T00:00:44.941-0700 I NETWORK reconnect 127.0.0.1:27017 (127.0.0.1) ok gechongrepl:SECONDARY> db.shutdownServer()
下面猜測：在關閉最后的Primary節點之前，先關掉仲裁節點即不會報錯。（首先關掉Primary節點，還有其他Secondary不屬於這種情況）
5：關閉順序APS ： 不會報錯 6：關閉順序ASP ： 不會報錯
驗證猜測：
5：關閉順序APS
A：
gechongrepl:ARBITER> use admin switched to db admin gechongrepl:ARBITER> db.shutdownServer()
P：
gechongrepl:PRIMARY> use admin switched to db admin gechongrepl:PRIMARY> db.shutdownServer()
S：因為仲裁節點關閉了。所以Primary節點不會再自動切換
gechongrepl:SECONDARY> use admin switched to db admin gechongrepl:SECONDARY> db.shutdownServer()
6：關閉順序ASP
A：
gechongrepl:ARBITER> use admin switched to db admin gechongrepl:ARBITER> db.shutdownServer()
S：
gechongrepl:SECONDARY> use admin switched to db admin gechongrepl:SECONDARY> db.shutdownServer()
P：
gechongrepl:PRIMARY> 2015-05-29T00:12:23.962-0700 I NETWORK DBClientCursor::init call() failed 2015-05-29T00:12:23.965-0700 I NETWORK trying reconnect to 127.0.0.1:27017 (127.0.0.1) failed 2015-05-29T00:12:23.966-0700 I NETWORK reconnect 127.0.0.1:27017 (127.0.0.1) ok gechongrepl:SECONDARY> gechongrepl:SECONDARY> use admin switched to db admin gechongrepl:SECONDARY> db.shutdownServer()
總結：
1：先關閉從節點、仲裁節點。或者先關閉仲裁節點，最后關閉從節點。則：主節點自動變為從節點
2：先關閉主節點，則從節點自動變為主節點，在仲裁節點關閉之前，新主節點不能關閉
初始化的時候主從節點受priority的影響
priority: 是優先級，默認為1，優先級0為被動節點，不能成為活躍節點。優先級不位0則按照有大到小選出活躍節點。