|NO.Z.00045|——————————|^^ 配置 ^^|——|Hadoop&Redis.V13|——|Redis.v13|集群扩容缩容.v03|

一、Redis集群缩容：缩容

### --- 将7008实例剔除集群：

[root@hadoop ~]# cd /opt/yanqi/servers/redis-cluster/7008/bin/
[root@hadoop bin]# ./redis-cli --cluster del-node 192.168.1.111:7008 6b0f8c1d1cf193b839785db883f2ff27b78f51cc

二、若是剔除失败：解决方案

### --- 删除已经占有hash槽的结点会失败，报错如下：
~~~     需要将该结点占用的hash槽分配出去。

[ERR] Node 192.168.127.111:7008 is not empty! Reshard data away and try again.

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附录一：

### --- 报错现象：
~~~     注意：如果原来该结点在集群中的配置信息已经生成到cluster-config-file指定的配置文件中
~~~     （如果cluster-config-file没有指定则默认为nodes.conf），这时可能会报错：

[ERR] Node XXXXXX is not empty. Either the node already knows other nodes (check
with CLUSTER NODES) or contains some key in database 0

### --- 解决方案:

~~~     解决方法是删除生成的配置文件nodes.conf，
~~~     删除后再执行./redis-cli --cluster add-node 指令

### --- 查看结果:
~~~     查看集群中的结点，刚添加的7008为7007的从节点：

127.0.0.1:7001> cluster nodes
37620c20e51f0a99daec1c2f55152404954e045e 192.168.1.123:7003@17003 master - 0 1631892472250 3 connected 11922-16383
def5f23743a18d2fe77953dbec14a31ef7eb94be 192.168.1.123:7008@17008 slave dc7283203025fc876c0e13d1c66456811f939338 0 1631892469000 7 connected
0e9cbea7cad8ce63e26152c8c391e2d77d014db5 192.168.1.123:7004@17004 slave 37620c20e51f0a99daec1c2f55152404954e045e 0 1631892470235 4 connected
8030adb5bd2ac0e86ed8b24d76dcdcf87f43beb6 192.168.1.123:7001@17001 myself,master - 0 1631892470000 1 connected 999-5460
dc7283203025fc876c0e13d1c66456811f939338 192.168.1.123:7007@17007 master - 0 1631892470000 7 connected 0-998 5461-6461 10923-11921
a7e04ef1f6545a9c6796f7c555b89dc1dd94bb3d 192.168.1.123:7002@17002 master - 0 1631892469229 2 connected 6462-10922
5b5ad10b94a72916cab9e32adc0e8d10ed28cdee 192.168.1.123:7005@17005 slave 8030adb5bd2ac0e86ed8b24d76dcdcf87f43beb6 0 1631892470000 5 connected
d7a4c1520a8713d8aee07d44c6d3f67cdf1c7fd7 192.168.1.123:7006@17006 slave a7e04ef1f6545a9c6796f7c555b89dc1dd94bb3d 0 1631892471243 2 connected

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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