Target: removed from a cluster from a set of primary (5007,5008)
After an increase in the main 5007,5008 from the service node, cluster current situation is this:
b3363a81c3c59d57143cd3323481259c044e66d2 192.168.8.196:5006@15006 slave 1b7aa419065c5477c0def9d5e25106963fbdda76 0 1573003356000 3 connected
1b7aa419065c5477c0def9d5e25106963fbdda76 192.168.8.196:5003@15003 master - 0 1573003352829 3 connected 11089-16383
fbf9f23ecf0fea399debf7db42c73fece04b98fd 192.168.8.196:5005@15005 slave b1b67d4e554e29605bdbe40deab6670a42dd8836 0 1573003356842 2 connected
b1b67d4e554e29605bdbe40deab6670a42dd8836 192.168.8.196:5002@15002 master - 0 1573003355000 2 connected 5628-10922
d1a4b1aa3e924a5917efc240cdb2e3ada39e01c2 192.168.8.196:5001@15001 master - 0 1573003354837 1 connected 166-5460
9dc870942555447543694e42e40061823ed91271 192.168.8.196:5004@15004 slave d1a4b1aa3e924a5917efc240cdb2e3ada39e01c2 0 1573003357846 1 connected
63aa476d990dfa9f5f40eeeaa0315e7f9948554d 192.168.8.196:5007@15007 master - 0 1573003356000 7 connected 0-165 5461-5627 10923-11088
d3a9de370962873d17f1124bcf9ac166cc6ba950 192.168.8.196:5008@15008 myself,slave 63aa476d990dfa9f5f40eeeaa0315e7f9948554d 0 1573003350000 0 connected
| No. | master node | slave node |
|---|---|---|
| 1 | 192.168.8.196:5001 | 192.168.8.196:5004 |
| 2 | 192.168.8.196:5002 | 192.168.8.196:5005 |
| 3 | 192.168.8.196:5003 | 192.168.8.196:5006 |
| 4 | 192.168.8.196:5007 | 192.168.8.196:5008 |
Implemented:
1. First, the node is removed from the 192.168.8.196:5008
redis-cli --cluster del-node 192.168.8.196:5008 d3a9de370962873d17f1124bcf9ac166cc6ba950
>> Removing node d3a9de370962873d17f1124bcf9ac166cc6ba950 from cluster 192.168.8.196:5008
>> Sending CLUSTER FORGET messages to the cluster...
>> SHUTDOWN the node.
>>In this case, 192.168.8.196: 5008 has been removed from the node.
192.168.8.196:5001> cluster nodes
b3363a81c3c59d57143cd3323481259c044e66d2 192.168.8.196:5006@15006 slave 1b7aa419065c5477c0def9d5e25106963fbdda76 0 1573004309001 6 connected
9dc870942555447543694e42e40061823ed91271 192.168.8.196:5004@15004 slave d1a4b1aa3e924a5917efc240cdb2e3ada39e01c2 0 1573004310000 4 connected
1b7aa419065c5477c0def9d5e25106963fbdda76 192.168.8.196:5003@15003 master - 0 1573004311007 3 connected 11089-16383
b1b67d4e554e29605bdbe40deab6670a42dd8836 192.168.8.196:5002@15002 master - 0 1573004307000 2 connected 5628-10922
63aa476d990dfa9f5f40eeeaa0315e7f9948554d 192.168.8.196:5007@15007 master - 0 1573004307000 7 connected 0-165 5461-5627 10923-11088
fbf9f23ecf0fea399debf7db42c73fece04b98fd 192.168.8.196:5005@15005 slave b1b67d4e554e29605bdbe40deab6670a42dd8836 0 1573004310004 5 connected
d1a4b1aa3e924a5917efc240cdb2e3ada39e01c2 192.168.8.196:5001@15001 myself,master - 0 1573004308000 1 connected 166-5460
- 192.168.8.196:5007 master node of the new slice, the slices on to the other node 5007
$ redis-cli --cluster reshard 192.168.8.196:5007
Q & A session will look at items
#需要移动数据槽的数量
How many slots do you want to move (from 1 to 16384)? 500
#需要接受数据槽的主节点ID，这里我们填写5001号主服务节点ID
What is the receiving node ID? d1a4b1aa3e924a5917efc240cdb2e3ada39e01c2
#填写数据槽来源节点
Please enter all the source node IDs.
Type 'all' to use all the nodes as source nodes for the hash slots.
Type 'done' once you entered all the source nodes IDs.
Source node #1: 63aa476d990dfa9f5f40eeeaa0315e7f9948554d
Source node #2: done
After the execution, the number of data slots 5007 on the master node has been transferred to the 5001 master node. In this case, no data on the 5007 channel.
b3363a81c3c59d57143cd3323481259c044e66d2 192.168.8.196:5006@15006 slave 1b7aa419065c5477c0def9d5e25106963fbdda76 0 1573004510000 6 connected
9dc870942555447543694e42e40061823ed91271 192.168.8.196:5004@15004 slave d1a4b1aa3e924a5917efc240cdb2e3ada39e01c2 0 1573004510589 8 connected
1b7aa419065c5477c0def9d5e25106963fbdda76 192.168.8.196:5003@15003 master - 0 1573004508000 3 connected 11089-16383
b1b67d4e554e29605bdbe40deab6670a42dd8836 192.168.8.196:5002@15002 master - 0 1573004510000 2 connected 5628-10922
63aa476d990dfa9f5f40eeeaa0315e7f9948554d 192.168.8.196:5007@15007 master - 0 1573004508000 7 connected
fbf9f23ecf0fea399debf7db42c73fece04b98fd 192.168.8.196:5005@15005 slave b1b67d4e554e29605bdbe40deab6670a42dd8836 0 1573004511594 5 connected
d1a4b1aa3e924a5917efc240cdb2e3ada39e01c2 192.168.8.196:5001@15001 myself,master - 0 1573004509000 8 connected 0-5627 10923-11088
3. The final step, removing 192.168.8.196:5007
$ redis-cli --cluster del-node 192.168.8.196:5007 63aa476d990dfa9f5f40eeeaa0315e7f9948554d
>>> Removing node 63aa476d990dfa9f5f40eeeaa0315e7f9948554d from cluster 192.168.8.196:5007
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.4.5007,5008 master and slave node have been removed, done.
192.168.8.196:5001> cluster nodes
b3363a81c3c59d57143cd3323481259c044e66d2 192.168.8.196:5006@15006 slave 1b7aa419065c5477c0def9d5e25106963fbdda76 0 1573004592840 6 connected
9dc870942555447543694e42e40061823ed91271 192.168.8.196:5004@15004 slave d1a4b1aa3e924a5917efc240cdb2e3ada39e01c2 0 1573004591000 8 connected
1b7aa419065c5477c0def9d5e25106963fbdda76 192.168.8.196:5003@15003 master - 0 1573004591000 3 connected 11089-16383
b1b67d4e554e29605bdbe40deab6670a42dd8836 192.168.8.196:5002@15002 master - 0 1573004591838 2 connected 5628-10922
fbf9f23ecf0fea399debf7db42c73fece04b98fd 192.168.8.196:5005@15005 slave b1b67d4e554e29605bdbe40deab6670a42dd8836 0 1573004591000 5 connected
d1a4b1aa3e924a5917efc240cdb2e3ada39e01c2 192.168.8.196:5001@15001 myself,master - 0 1573004589000 8 connected 0-5627 10923-11088