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我已經在本地主機上設置了分片mongo數據庫環境,包含3個配置服務器和2個分片mongo實例以及一個mongos。分片mongodb不會重新分配數據
一旦集羣已經開始了,我運行的命令序列如下:
sh.addShard("127.0.0.1:27010")
sh.addShard("127.0.0.1:27011")
a = {"_id" : 1, "value" : 1}
b = {"_id" : 2, "value" : 2}
c = {"_id" : 3, "value" : 3}
d = {"_id" : 4, "value" : 4}
use foobar;
db.foo.insert(a);
db.foo.insert(b);
db.foo.insert(c);
db.foo.insert(d);
的我啓用拆分數據庫,並創建一個索引等
sh.enableSharding("foobar");
db.foo.ensureIndex({"value":"hashed"});
sh.shardCollection("foobar.foo", { value: "hashed" })
所有的結果上述操作是成功的。
但是,一旦我做: db.foo.stats()
我看到所有的數據只是一個碎片沒有被分配結束。運行
db.printShardingStatus();
生產:
--- Sharding Status ---
sharding version: {
"_id" : 1,
"version" : 3,
"minCompatibleVersion" : 3,
"currentVersion" : 4,
"clusterId" : ObjectId("52170e8a7633066f09e0c9d3")
}
shards:
{ "_id" : "shard0000", "host" : "127.0.0.1:27010" }
{ "_id" : "shard0001", "host" : "127.0.0.1:27011" }
databases:
{ "_id" : "admin", "partitioned" : false, "primary" : "config" }
{ "_id" : "foobar", "partitioned" : true, "primary" : "shard0000" }
foobar.foo
shard key: { "value" : "hashed" }
chunks:
shard0000 1
{ "value" : { "$minKey" : 1 } } -->> { "value" : { "$maxKey" : 1 } } on : shard0000 Timestamp(1, 0)
有趣的是,不過,如果我開始一個空白的收集和有將任何數據之前啓用它分片,結果有很大的不同:
db.foo.stats();
{
"sharded" : true,
"ns" : "foobar.foo",
"count" : 4,
"numExtents" : 2,
"size" : 144,
"storageSize" : 16384,
"totalIndexSize" : 32704,
"indexSizes" : {
"_id_" : 16352,
"value_hashed" : 16352
},
"avgObjSize" : 36,
"nindexes" : 2,
"nchunks" : 4,
"shards" : {
"shard0000" : {
"ns" : "foobar.foo",
"count" : 1,
"size" : 36,
"avgObjSize" : 36,
"storageSize" : 8192,
"numExtents" : 1,
"nindexes" : 2,
"lastExtentSize" : 8192,
"paddingFactor" : 1,
"systemFlags" : 1,
"userFlags" : 0,
"totalIndexSize" : 16352,
"indexSizes" : {
"_id_" : 8176,
"value_hashed" : 8176
},
"ok" : 1
},
"shard0001" : {
"ns" : "foobar.foo",
"count" : 3,
"size" : 108,
"avgObjSize" : 36,
"storageSize" : 8192,
"numExtents" : 1,
"nindexes" : 2,
"lastExtentSize" : 8192,
"paddingFactor" : 1,
"systemFlags" : 1,
"userFlags" : 0,
"totalIndexSize" : 16352,
"indexSizes" : {
"_id_" : 8176,
"value_hashed" : 8176
},
"ok" : 1
}
},
"ok" : 1
}
所以問題是我是否缺少一些東西,如果我分割現有的集合?