（1）查看chunk迁移情况
发现balance处存在报错： Migration Results for the last 24 hours: 
                7356 : Failed with error 'aborted', from audit-platform_ZzcNqamf_shard_1 to audit-platform_oDOgDaDZ

mongos> show dbs;
admin              0.000GB
pro_db1            8858.442GB
config             0.194GB
test               0.000GB
mongos> use pro_db1
switched to db pro_db1
mongos> 
mongos> 
mongos> 
mongos> sh.status()
--- Sharding Status --- 
  sharding version: {
  	"_id" : 1,
  	"minCompatibleVersion" : 5,
  	"currentVersion" : 6,
  	"clusterId" : ObjectId("6018fee5be7133283e1eb522")
  }
  shards:
        {  "_id" : "audit-platform_ZzcNqamf_shard_1",  "host" : "audit-platform_ZzcNqamf_shard_1/10.131.212.121:20000,10.131.26.63:20000,10.131.26.65:20000",  "state" : 1 }
        {  "_id" : "audit-platform_oDOgDaDZ",  "host" : "audit-platform_oDOgDaDZ/10.131.172.191:20000,10.131.172.192:20000,10.131.172.193:20000",  "state" : 1 }
        {  "_id" : "audit-platform_qeNUgkwj",  "host" : "audit-platform_qeNUgkwj/10.129.89.117:20000,10.129.89.118:20000,10.131.95.42:20000",  "state" : 1 }
  active mongoses:
        "3.6.10" : 3
  autosplit:
        Currently enabled: yes
  balancer:
        Currently enabled:  yes
        Currently running:  no
        Failed balancer rounds in last 5 attempts:  0
        Migration Results for the last 24 hours: 
                7356 : Failed with error 'aborted', from audit-platform_ZzcNqamf_shard_1 to audit-platform_oDOgDaDZ
  databases:
        {  "_id" : "pro_db1",  "primary" : "audit-platform_ZzcNqamf_shard_1",  "partitioned" : true }
                pro_db1.product_2014_20
                        shard key: { "biz_id" : "hashed" }
                        unique: false
                        balancing: true
                        chunks:
                                audit-platform_ZzcNqamf_shard_1	19576
                                audit-platform_oDOgDaDZ	19576
                                audit-platform_qeNUgkwj	19574
                        too many chunks to print, use verbose if you want to force print
                pro_db1.product_2041
                        shard key: { "biz_id" : "hashed" }
                        unique: false
                        balancing: true
                        chunks:
                                audit-platform_ZzcNqamf_shard_1	235108
                                audit-platform_oDOgDaDZ	19017
                                audit-platform_qeNUgkwj	19018
                        too many chunks to print, use verbose if you want to force print
        {  "_id" : "config",  "primary" : "config",  "partitioned" : true }
                config.system.sessions
                        shard key: { "_id" : 1 }
                        unique: false
                        balancing: true
                        chunks:
                                audit-platform_ZzcNqamf_shard_1	1
                        { "_id" : { "$minKey" : 1 } } -->> { "_id" : { "$maxKey" : 1 } } on : audit-platform_ZzcNqamf_shard_1 Timestamp(1, 0) 
        {  "_id" : "test",  "primary" : "audit-platform_ZzcNqamf_shard_1",  "partitioned" : false }

mongos> 


（2）到platform_ZzcNqamf_shard_1分片主节点查看报错日志：
2022-01-17T17:28:38.518+0800 I SHARDING [conn82] about to log metadata event into changelog: { _id: "10-131-26-65.mongodb-fatpod-audit-platform.cp01-2022-01-17T17:28:38.518+0800-61e536c69f56bc1b2025e6ef", server: "10-131-26-65.mongodb-fatpod-audit-platform.cp01", clientAddr: "10.130.145.75:50376", time: new Date(1642411718518), what: "moveChunk.from", ns: "pro_db1.product_2041", details: { min: { biz_id: -6656423545813652642 }, max: { biz_id: -6656354113587583176 }, step 1 of 6: 0, step 2 of 6: 170, step 3 of 6: 204, to: "audit-platform_oDOgDaDZ", from: "audit-platform_ZzcNqamf_shard_1", note: "aborted" } }


（3）查看configdb的主节点报错日志
提示存在key重复
2022-01-18T10:10:30.240+0800 I SHARDING [Balancer] Balancer move pro_db1.product_2041: [{ biz_id: -6656423545813652642 }, { biz_id: -6656354113587583176 }), from audit-platform_ZzcNqamf_shard_1, to audit-platform_oDOgDaDZ failed :: caused by :: OperationFailed: Data transfer error: migrate failed: DuplicateKey: operation was interrupted


查看config的chunk信息
audit-platform_ZzcNqamf_configdb:PRIMARY> db.chunks.find({"ns" : "pro_db1.product_2041", "min.biz_id":{$gte: -6656423545813652642}}).sort({"min.biz_id":1}).limit(10).pretty()
{
	"_id" : "pro_db1.product_2041-biz_id_-6656354113587583176",
	"ns" : "pro_db1.product_2041",
	"min" : {
		"biz_id" : NumberLong("-6656354113587583176")
	},
	"max" : {
		"biz_id" : NumberLong("-6656292787770310286")
	},
	"shard" : "audit-platform_ZzcNqamf_shard_1",
	"lastmod" : Timestamp(1, 38036),
	"lastmodEpoch" : ObjectId("61c9314478ba24c26b583114")
}
{
	"_id" : "pro_db1.product_2041-biz_id_-6656292787770310286",
	"ns" : "pro_db1.product_2041",
	"min" : {
		"biz_id" : NumberLong("-6656292787770310286")
	},
	"max" : {
		"biz_id" : NumberLong("-6656222465990085290")
	},
	"shard" : "audit-platform_ZzcNqamf_shard_1",
	"lastmod" : Timestamp(1, 38037),
	"lastmodEpoch" : ObjectId("61c9314478ba24c26b583114")
}