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MongoDB副本集配置系列四：节点的关闭顺序

發布時間：2024/1/17 编程问答 29 豆豆

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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()

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

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 2015-05-28T23:59:19.685-0700at 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 2015-05-28T23:59:19.685-0700at 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不屬于這種情況）

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。

轉載于:https://www.cnblogs.com/xiaoit/p/4538608.html

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