MongoDB实战系列之六（2）：mongodb的高可用集群设计实战

在分片后新写数据第一次：

mongos> db.elain.stats();

{

"sharded" : true,

"flags" : 1,

"ns" : "elain.elain",

"count" : 676496,

"numExtents" : 12,

"size" : 112500436,

"storageSize" : 129179648,

"totalIndexSize" : 47551616,

"indexSizes" : {

"_id_" : 21968912,

"client_userid_1" : 25582704

},

"avgObjSize" : 166.29874529930703,

"nindexes" : 2,

"nchunks" : 8,

"shards" : {

"shard1" : {

"ns" : "elain.elain",

"count" : 0,

"size" : 0,

"storageSize" : 8192,

"numExtents" : 1,

"nindexes" : 2,

"lastExtentSize" : 8192,

"paddingFactor" : 1,

"flags" : 1,

"totalIndexSize" : 16352,

"indexSizes" : {

"_id_" : 8176,

"client_userid_1" : 8176

},

"ok" : 1

},

"shard2" : {

"ns" : "elain.elain",

"count" : 676496,

"size" : 112500436,

"avgObjSize" : 166.29874529930703,

"storageSize" : 129171456,

"numExtents" : 11,

"nindexes" : 2,

"lastExtentSize" : 31322112,

"paddingFactor" : 1,

"flags" : 1,

"totalIndexSize" : 47535264,

"indexSizes" : {

"_id_" : 21960736,

"client_userid_1" : 25574528

},

"ok" : 1

}

},

"ok" : 1

}

分片后新写数据第二次：

mongos> db.elain.stats();

{

"sharded" : true,

"flags" : 1,

"ns" : "elain.elain",

"count" : 1189194,

"numExtents" : 23,

"size" : 194533928,

"storageSize" : 252874752,

"totalIndexSize" : 87262448,

"indexSizes" : {

"_id_" : 43692544,

"client_userid_1" : 43569904

},

"avgObjSize" : 163.58468677103988,

"nindexes" : 2,

"nchunks" : 8,

"shards" : {

"shard1" : {

"ns" : "elain.elain",

"count" : 396370,

"size" : 62195348,

"avgObjSize" : 156.91234957236924,

"storageSize" : 86114304,

"numExtents" : 11,

"nindexes" : 2,

"lastExtentSize" : 20881408,

"paddingFactor" : 1,

"flags" : 1,

"totalIndexSize" : 35949872,

"indexSizes" : {

"_id_" : 17954496,

"client_userid_1" : 17995376

},

"ok" : 1

},

"shard2" : {

"ns" : "elain.elain",

"count" : 792824,

"size" : 132338580,

"avgObjSize" : 166.9205019020615,

"storageSize" : 166760448,

"numExtents" : 12,

"nindexes" : 2,

"lastExtentSize" : 37588992,

"paddingFactor" : 1,

"flags" : 1,

"totalIndexSize" : 51312576,

"indexSizes" : {

"_id_" : 25738048,

"client_userid_1" : 25574528

},

"ok" : 1

}

},

"ok" : 1

}

分片后新写数据第三次：

mongos> db.elain.stats();

{

"sharded" : true,

"flags" : 1,

"ns" : "elain.elain",

"count" : 1376876,

"numExtents" : 23,

"size" : 225576604,

"storageSize" : 252874752,

"totalIndexSize" : 100826432,

"indexSizes" : {

"_id_" : 50249696,

"client_userid_1" : 50576736

},

"avgObjSize" : 163.83218532387812,

"nindexes" : 2,

"nchunks" : 10,

"shards" : {

"shard1" : {

"ns" : "elain.elain",

"count" : 494202,

"size" : 77551984,

"avgObjSize" : 156.92365469990003,

"storageSize" : 86114304,

"numExtents" : 11,

"nindexes" : 2,

"lastExtentSize" : 20881408,

"paddingFactor" : 1,

"flags" : 1,

"totalIndexSize" : 42057344,

"indexSizes" : {

"_id_" : 21600992,

"client_userid_1" : 20456352

},

"ok" : 1

},

"shard2" : {

"ns" : "elain.elain",

"count" : 882674,

"size" : 148024620,

"avgObjSize" : 167.70021548159343,

"storageSize" : 166760448,

"numExtents" : 12,

"nindexes" : 2,

"lastExtentSize" : 37588992,

"paddingFactor" : 1,

"flags" : 1,

"totalIndexSize" : 58769088,

"indexSizes" : {

"_id_" : 28648704,

"client_userid_1" : 30120384

},

"ok" : 1

}

},

"ok" : 1

}

分片后新写数据第四次（DOWN 掉md04的mongo服务）

mongos> db.elain.stats();

{

"sharded" : true,

"flags" : 1,

"ns" : "elain.elain",

"count" : 1686310,

"numExtents" : 26,

"size" : 275761376,

"storageSize" : 353116160,

"totalIndexSize" : 129033632,

"indexSizes" : {

"_id_" : 63265888,

"client_userid_1" : 65767744

},

"avgObjSize" : 163.52946729842083,

"nindexes" : 2,

"nchunks" : 10,

"shards" : {

"shard1" : {

"ns" : "elain.elain",

"count" : 740264,

"size" : 116213588,

"avgObjSize" : 156.98938216636228,

"storageSize" : 141246464,

"numExtents" : 13,

"nindexes" : 2,

"lastExtentSize" : 30072832,

"paddingFactor" : 1,

"flags" : 1,

"totalIndexSize" : 61810560,

"indexSizes" : {

"_id_" : 32556832,

"client_userid_1" : 29253728

},

"ok" : 1

},

"shard2" : {

"ns" : "elain.elain",

"count" : 946046,

"size" : 159547788,

"avgObjSize" : 168.64696642657967,

"storageSize" : 211869696,

"numExtents" : 13,

"nindexes" : 2,

"lastExtentSize" : 45109248,

"paddingFactor" : 1,

"flags" : 1,

"totalIndexSize" : 67223072,

"indexSizes" : {

"_id_" : 30709056,

"client_userid_1" : 36514016

},

"ok" : 1

}

},

"ok" : 1

}

总结：通过以上四次的写数据测试，我们可以看到分片是成功的，每次写数据,shard1、shard2都有数据写入，且，在下面的复制集中DOWN 掉任意一台，不影响整个架构的正常服务。

删除片操作

mongos> db.runCommand({"removeshard" : "10.0.0.11:27011"});

{

"msg" : "draining started successfully",

"state" : "started",

"shard" : "shard2",

"ok" : 1

}

再执行，可看到removeshard的挪动进度

mongos> db.runCommand({"removeshard" : "10.0.0.11:27011"});

{

"msg" : "draining ongoing",

"state" : "ongoing",

"remaining" : {

"chunks" : NumberLong(3),

"dbs" : NumberLong(0)

},

"ok" : 1

}

到此结束