Question

我的MongoDB遇到了一些麻烦。这是我的配置：

mongos> sh.status()
    --- Sharding Status --- 
      sharding version: {
            "_id" : 1,
            "version" : 4,
            "minCompatibleVersion" : 4,
            "currentVersion" : 5,
            "clusterId" : ObjectId("546f2d9c37d2895f3b8f9ec1")
    }
      shards:
            {  "_id" : "site_A_shard_1",  "host" : "site_A_shard_1/<HOST1>:27510,<HOST2>:27511",  "tags" : [ "site_A" ] }
            {  "_id" : "site_A_shard_2",  "host" : "site_A_shard_2/<HOST2>:27521,<HOST1>:27520",  "tags" : [ "site_A" ] }
            {  "_id" : "site_B_shard_1",  "host" : "site_B_shard_1/<HOST3>:27510,<HOST4>:27511",  "tags" : [ "site_B" ] }
            {  "_id" : "site_B_shard_2",  "host" : "site_B_shard_2/<HOST4>:27521,<HOST3>:27520",  "tags" : [ "site_B" ] }
      databases:
            {  "_id" : "admin",  "partitioned" : false,  "primary" : "config" }
            {  "_id" : "test",  "partitioned" : false,  "primary" : "site_B_shard_1" }
            {  "_id" : "ocs",  "partitioned" : true,  "primary" : "site_B_shard_1" }
                    ocs.adrs_queue
                            shard key: { "shard.target" : 1, "shard.key" : 1 }
                            { "shard.target" : { "$minKey" : 1 }, "shard.key" : { "$minKey" : 1 } } -->> { "shard.target" : { "$maxKey" : 1 }, "shard.key" : { "$maxKey" : 1 } } on : site_B_shard_1 Timestamp(1, 0) 
                             tag: site_A  { "shard" : { "target" : "siteA", "key" : { "$minKey" : 1 } } } -->> { "shard" : { "target" : "siteA", "key" : { "$maxKey" : 1 } } }
                             tag: site_B  { "shard" : { "target" : "siteB", "key" : { "$minKey" : 1 } } } -->> { "shard" : { "target" : "siteB", "key" : { "$maxKey" : 1 } } }
                    ocs.ldrs
                            shard key: { "shard.target" : 1, "shard.key" : 1 }
                            { "shard.target" : { "$minKey" : 1 }, "shard.key" : { "$minKey" : 1 } } -->> { "shard.target" : { "$maxKey" : 1 }, "shard.key" : { "$maxKey" : 1 } } on : site_B_shard_1 Timestamp(1, 0) 
                             tag: site_A  { "shard" : { "target" : "siteA", "key" : { "$minKey" : 1 } } } -->> { "shard" : { "target" : "siteA", "key" : { "$maxKey" : 1 } } }
                             tag: site_B  { "shard" : { "target" : "siteB", "key" : { "$minKey" : 1 } } } -->> { "shard" : { "target" : "siteB", "key" : { "$maxKey" : 1 } } }
                    ocs.notifs_queue
                            shard key: { "shard.target" : 1, "shard.key" : 1 }
                            { "shard.target" : { "$minKey" : 1 }, "shard.key" : { "$minKey" : 1 } } -->> { "shard.target" : { "$maxKey" : 1 }, "shard.key" : { "$maxKey" : 1 } } on : site_B_shard_1 Timestamp(1, 0) 
                             tag: site_A  { "shard" : { "target" : "siteA", "key" : { "$minKey" : 1 } } } -->> { "shard" : { "target" : "siteA", "key" : { "$maxKey" : 1 } } }
                             tag: site_B  { "shard" : { "target" : "siteB", "key" : { "$minKey" : 1 } } } -->> { "shard" : { "target" : "siteB", "key" : { "$maxKey" : 1 } } }
                    ocs.ss_queue
                            shard key: { "shard.target" : 1, "shard.key" : 1 }
                            { "shard.target" : { "$minKey" : 1 }, "shard.key" : { "$minKey" : 1 } } -->> { "shard.target" : { "$maxKey" : 1 }, "shard.key" : { "$maxKey" : 1 } } on : site_B_shard_1 Timestamp(1, 0) 
                             tag: site_A  { "shard" : { "target" : "siteA", "key" : { "$minKey" : 1 } } } -->> { "shard" : { "target" : "siteA", "key" : { "$maxKey" : 1 } } }
                             tag: site_B  { "shard" : { "target" : "siteB", "key" : { "$minKey" : 1 } } } -->> { "shard" : { "target" : "siteB", "key" : { "$maxKey" : 1 } } }

尽管配置了标签范围，但它似乎不起作用。每次我尝试插入一些信息时，它都会存储在同一个分片（site_B_shard_1）中，即使关联的标记是site_A。

我做错了什么？

Answer 1

您似乎尝试在两个分片中分发单个集合，但定义了重叠shard tag ranges，其中site_A和site_B包含shard.target项的全部范围值（minkey .. maxkey）：

tag: site_A  {
    "shard" : {
        "target" : "siteA",
        "key" : { "$minKey" : 1 }
    }
} -->> {
    "shard" : {
        "target" : "siteA",
        "key" : { "$maxKey" : 1 }
    }
}

tag: site_B  {
    "shard" : {
        "target" : "siteB",
        "key" : { "$minKey" : 1 }
    }
} -->> {
    "shard" : {
        "target" : "siteB",
        "key" : { "$maxKey" : 1 }
    }
}

如果要使用标记感知分片在集合中分发数据，则需要定义下限包含的范围，上限是独占的，例如：

sh.addTagRange（＆＃39; ocs.adrs_queue＆＃39; {＆＃34; shard.target＆＃34;：MinKey}，{＆＃34; shard.target＆＃34;：＆＃34;＆Site_A的＃34;}，＆＃39; Site_A的＆＃39;） sh.addTagRange（＆＃39; ocs.adrs_queue＆＃39; {＆＃34; shard.target＆＃34;：＆＃34; Site_A的＆＃34;}，{＆＃34; shard.target＆＃34;：＆＃34; site_B＆＃34;}，＆＃39; Site_A的＆＃39;） sh.addTagRange（＆＃39; ocs.adrs_queue＆＃39; {＆＃34; shard.target＆＃34;：＆＃34; site_B＆＃34;}，{＆＃34; shard.target＆＃34;：MaxKey }，＆＃39; site_B＆＃39）

在此设置中：

shard.target值匹配site_A和site_B的文档应分发到匹配的分片
shard.target值小于site_A的文档也将在site_A分片上分发
shard.target值大于site_B的文档将在site_B分片上分发

有关标记感知分片和多数据中心部署的更多示例，请参阅：

MongoDB标记范围不起作用

1 个答案: