Question

我有mongoDb副本集，一个主要的一个次要和一个仲裁者投票。我计划实现分片，因为预计数据会呈指数级增长。我发现很难跟踪mongoDb文档进行分片。有人可以清楚解释它来设置它。提前谢谢。

Answer 1

如果你能完成复制，那么分片就很简单了。在快进中重复mongo文档：

下面是一个示例设置：3个configDB和3个分片对于下面的示例，您可以在一台计算机上运行所有计算机以查看它是否正常工作。

如果您需要三个分片设置三个副本集。（假设3个主要是127：0.0.1：27000,127.0.0.1:37000,127.0.0.1:47000）
将3个实例作为三个配置服务器运行。（假设：127.0.0.1:27020,127.0.0.1:27021,127.0.0.1:270122）
启动mongos（注意mongos中的s），让它知道配置服务器的位置。（例如：127.0.0.1：27023）
从mongo shell连接到mongos，并将3个副本集中的三个主要mongod添加为分片。
为您的数据库启用分片。
如果需要，可以为集合启用分片。
如果需要，请选择分片键。（非常重要，你第一次就做对了!!!）
检查分片状态
泵数据;连接到单个mongod primarys并查看分布在三个分片中的数据。



#start mongos with three configs:
mongos --port 27023 --configdb localhost:27017,localhost:27018,localhost:27019

mongos> sh.addShard("127.0.0.1:27000");
{ "shardAdded" : "shard0000", "ok" : 1 }
mongos> sh.addShard("127.0.0.1:37000");
{ "shardAdded" : "shard0001", "ok" : 1 }
mongos> sh.addShard("127.0.0.1:47000");
{ "shardAdded" : "shard0002", "ok" : 1 }
mongos> sh.enableSharding("db_to_shard");
{ "ok" : 1 }
mongos> use db_to_shard;
switched to db db_to_shard
mongos>
mongos> sh.shardCollection("db_to_shard.coll_to_shard", {collId: 1, createdDate: 1} );
{ "collectionsharded" : "db_to_shard.coll_to_shard", "ok" : 1 }
mongos> show databases;
admin        (empty)
config       0.063GB
db_to_shard  0.078GB
mongos> sh.status();
--- Sharding Status ---
  sharding version: {
        "_id" : 1,
        "minCompatibleVersion" : 5,
        "currentVersion" : 6,
        "clusterId" : ObjectId("557003eb4a4e61bb2ea0555b")
}
  shards:
        {  "_id" : "shard0000",  "host" : "127.0.0.1:27000" }
        {  "_id" : "shard0001",  "host" : "127.0.0.1:37000" }
        {  "_id" : "shard0002",  "host" : "127.0.0.1:47000" }
  balancer:
        Currently enabled:  yes
        Currently running:  no
        Failed balancer rounds in last 5 attempts:  0
        Migration Results for the last 24 hours:
                No recent migrations
  databases:
        {  "_id" : "admin",  "partitioned" : false,  "primary" : "config" }
        {  "_id" : "test",  "partitioned" : false,  "primary" : "shard0000" }
        {  "_id" : "db_to_shard",  "partitioned" : true,  "primary" : "shard0000" }
                db_to_shard.coll_to_shard
                        shard key: { "collId" : 1, "createdDate" : 1 }
                        chunks:
                                shard0000       1
                        { "collId" : { "$minKey" : 1 }, "createdDate" : { "$minKey" : 1 } } -->> { "collId" : { "$maxKey" : 1 }, "createdDate" : { "$maxKey" : 1 } } on : shard0000 Timestamp(1, 0)

#start mongos with three configs: mongos --port 27023 --configdb localhost:27017,localhost:27018,localhost:27019 mongos> sh.addShard("127.0.0.1:27000"); { "shardAdded" : "shard0000", "ok" : 1 } mongos> sh.addShard("127.0.0.1:37000"); { "shardAdded" : "shard0001", "ok" : 1 } mongos> sh.addShard("127.0.0.1:47000"); { "shardAdded" : "shard0002", "ok" : 1 } mongos> sh.enableSharding("db_to_shard"); { "ok" : 1 } mongos> use db_to_shard; switched to db db_to_shard mongos> mongos> sh.shardCollection("db_to_shard.coll_to_shard", {collId: 1, createdDate: 1} ); { "collectionsharded" : "db_to_shard.coll_to_shard", "ok" : 1 } mongos> show databases; admin (empty) config 0.063GB db_to_shard 0.078GB mongos> sh.status(); --- Sharding Status --- sharding version: { "_id" : 1, "minCompatibleVersion" : 5, "currentVersion" : 6, "clusterId" : ObjectId("557003eb4a4e61bb2ea0555b") } shards: { "_id" : "shard0000", "host" : "127.0.0.1:27000" } { "_id" : "shard0001", "host" : "127.0.0.1:37000" } { "_id" : "shard0002", "host" : "127.0.0.1:47000" } balancer: Currently enabled: yes Currently running: no Failed balancer rounds in last 5 attempts: 0 Migration Results for the last 24 hours: No recent migrations databases: { "_id" : "admin", "partitioned" : false, "primary" : "config" } { "_id" : "test", "partitioned" : false, "primary" : "shard0000" } { "_id" : "db_to_shard", "partitioned" : true, "primary" : "shard0000" } db_to_shard.coll_to_shard shard key: { "collId" : 1, "createdDate" : 1 } chunks: shard0000 1 { "collId" : { "$minKey" : 1 }, "createdDate" : { "$minKey" : 1 } } -->> { "collId" : { "$maxKey" : 1 }, "createdDate" : { "$maxKey" : 1 } } on : shard0000 Timestamp(1, 0)

在复制集MongoDB中进行分片

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