redis叢集實踐

• 1、建立叢集

[[email protected] 7000]# redis-trib.rb create --replicas 1 10.9.251.104:7000 10.9.251.104:7001 10.9.251.104:7002 10.9.251.103:7000 10.9.251.103:7001 10.9.251.103:7002 >>> Creating cluster >>> Performing hash slots allocation on 6 nodes... Using 3 masters: 10.9.251.104:7000 10.9.251.103:7000 10.9.251.104:7001 Adding replica 10.9.251.103:7001 to 10.9.251.104:7000 Adding replica 10.9.251.104:7002 to 10.9.251.103:7000 Adding replica 10.9.251.103:7002 to 10.9.251.104:7001 M: 23719618cb3996b776a5926061fce31be398d68b 10.9.251.104:7000 slots:0-5460 (5461 slots) master M: bf01d4e7da106eaeaa52ccda12b310a59cf3c655 10.9.251.104:7001 slots:10923-16383 (5461 slots) master S: 88645c07a73eb3df4b8598365b0bc07278c31929 10.9.251.104:7002 replicates 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 M: 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 10.9.251.103:7000 slots:5461-10922 (5462 slots) master S: dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba 10.9.251.103:7001 replicates 23719618cb3996b776a5926061fce31be398d68b S: 832cb8bf04047db470e67db4656d992d1df8c1b2 10.9.251.103:7002 replicates bf01d4e7da106eaeaa52ccda12b310a59cf3c655 Can I set the above configuration? (type 'yes' to accept): yes >>> Nodes configuration updated >>> Assign a different config epoch to each node 29813:M 11 Jan 13:45:08.977 # configEpoch set to 1 via CLUSTER SET-CONFIG-EPOCH 29801:M 11 Jan 13:45:08.978 # configEpoch set to 2 via CLUSTER SET-CONFIG-EPOCH 29645:M 11 Jan 13:45:08.978 # configEpoch set to 3 via CLUSTER SET-CONFIG-EPOCH >>> Sending CLUSTER MEET messages to join the cluster 29813:M 11 Jan 13:45:08.990 # IP address for this node updated to 10.9.251.104 29645:M 11 Jan 13:45:09.064 # IP address for this node updated to 10.9.251.104 29801:M 11 Jan 13:45:09.064 # IP address for this node updated to 10.9.251.104 Waiting for the cluster to join....29813:M 11 Jan 13:45:13.876 # Cluster state changed: ok 29801:M 11 Jan 13:45:13.973 # Cluster state changed: ok
29645:S 11 Jan 13:45:14.004 # Cluster state changed: ok >>> Performing Cluster Check (using node 10.9.251.104:7000) M: 23719618cb3996b776a5926061fce31be398d68b 10.9.251.104:7000 slots:0-5460 (5461 slots) master 1 additional replica(s) M: 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 10.9.251.103:7000 slots:5461-10922 (5462 slots) master 1 additional replica(s) M: bf01d4e7da106eaeaa52ccda12b310a59cf3c655 10.9.251.104:7001 slots:10923-16383 (5461 slots) master 1 additional replica(s) S: dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba 10.9.251.103:7001 slots: (0 slots) slave replicates 23719618cb3996b776a5926061fce31be398d68b S: 832cb8bf04047db470e67db4656d992d1df8c1b2 10.9.251.103:7002 slots: (0 slots) slave replicates bf01d4e7da106eaeaa52ccda12b310a59cf3c655 S: 88645c07a73eb3df4b8598365b0bc07278c31929 10.9.251.104:7002 slots: (0 slots) slave replicates 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
2、連線叢集，設定值 [[email protected] 7000]# redis-cli -c -p 7000 -h 10.9.251.104 10.9.251.104:7000> get name -> Redirected to slot [5798] located at 10.9.251.103:7000 "zhaojiwei" 10.9.251.103:7000> get age -> Redirected to slot [741] located at 10.9.251.104:7000 "12" 10.9.251.104:7000> get key:001 -> Redirected to slot [13270] located at 10.9.251.104:7001 "val:001" 10.9.251.104:7001>
3、模擬叢集某一主機掛掉情況 以10.9.251.104:7000 掛掉，看資料是否異常。 [[email protected] 7000]# redis-trib.rb check 10.9.251.104:7000 >>> Performing Cluster Check (using node 10.9.251.104:7000) M: 23719618cb3996b776a5926061fce31be398d68b 10.9.251.104:7000 slots:0-5460 (5461 slots) master 1 additional replica(s) M: 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 10.9.251.103:7000 slots:5461-10922 (5462 slots) master 1 additional replica(s) M: bf01d4e7da106eaeaa52ccda12b310a59cf3c655 10.9.251.104:7001 slots:10923-16383 (5461 slots) master 1 additional replica(s) S: dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba 10.9.251.103:7001 slots: (0 slots) slave replicates 23719618cb3996b776a5926061fce31be398d68b S: 832cb8bf04047db470e67db4656d992d1df8c1b2 10.9.251.103:7002 slots: (0 slots) slave replicates bf01d4e7da106eaeaa52ccda12b310a59cf3c655 S: 88645c07a73eb3df4b8598365b0bc07278c31929 10.9.251.104:7002 slots: (0 slots) slave replicates 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. [[email protected] 7000]# ps -ef|grep redis root 29645 28360 0 13:28 pts/1 00:00:04 redis-server 10.9.251.104:7002 [cluster] root 29801 28360 0 13:44 pts/1 00:00:01 redis-server 10.9.251.104:7001 [cluster] root 29813 28360 0 13:44 pts/1 00:00:03 redis-server 10.9.251.104:7000 [cluster] root 30407 28360 0 14:52 pts/1 00:00:00 grep redis [[email protected] 7000]# kill 29813 29813:signal-handler (1484117582) Received SIGTERM scheduling shutdown... [[email protected] 7000]# 29813:M 11 Jan 14:53:02.322 # User requested shutdown... 29813:M 11 Jan 14:53:02.322 * Calling fsync() on the AOF file. 29813:M 11 Jan 14:53:02.322 * Saving the final RDB snapshot before exiting. 29813:M 11 Jan 14:53:02.338 * DB saved on disk 29813:M 11 Jan 14:53:02.338 * Removing the pid file. 29813:M 11 Jan 14:53:02.338 # Redis is now ready to exit, bye bye...
3.1現在檢視叢集狀態: 可以看到原叢集10.9.251.104:7000的副節點10.9.251.103:7001變更為主節點，頂替104:7000。叢集繼續執行。現在是3個主節點，2個副本節點如下： [[email protected] 7002]# redis-trib.rb check 10.9.251.103:7000 >>> Performing Cluster Check (using node 10.9.251.103:7000) M: 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 10.9.251.103:7000 slots:5461-10922 (5462 slots) master 1 additional replica(s) M: dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba 10.9.251.103:7001 slots:0-5460 (5461 slots) master 0 additional replica(s) S: 832cb8bf04047db470e67db4656d992d1df8c1b2 10.9.251.103:7002 slots: (0 slots) slave replicates bf01d4e7da106eaeaa52ccda12b310a59cf3c655 S: 88645c07a73eb3df4b8598365b0bc07278c31929 10.9.251.104:7002 slots: (0 slots) slave replicates 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 M: bf01d4e7da106eaeaa52ccda12b310a59cf3c655 10.9.251.104:7001 slots:10923-16383 (5461 slots) master 1 additional replica(s) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. 3.2 檢視此時叢集資料 [[email protected] 7002]# redis-cli -c -p 7000 -h 10.9.251.103 10.9.251.103:7000> get name "zhaojiwei" 10.9.251.103:7000> get age -> Redirected to slot [741] located at 10.9.251.103:7001 "12" 10.9.251.103:7001> get addres "\xe6\x9c\x9d\xe9\x98\xb3\xe5\x8c\xba" 10.9.251.103:7001> get key:001 -> Redirected to slot [13270] located at 10.9.251.104:7001 "val:001" 10.9.251.104:7001> 這與原叢集資料對比下：可以發現原來key為age的資料位於104:7000上，現在位於103:7001上。資料並沒有丟失。
3.3 如果實在是太不幸，剛頂替的主節點10.9.251.103:7001也掛掉了，這時候叢集會怎麼樣？ too bad！叢集雜湊槽16348個不能被完全覆蓋。叢集掛了，讀和寫都不可以。 也即是說叢集需要至少有3個主節點在執行。
[[email protected] 7002]# ps -ef|grep redis root 17012 16261 0 13:28 pts/3 00:00:02 redis-server 10.9.251.103:7000 [cluster] root 17020 16261 0 13:29 pts/3 00:00:05 redis-server 10.9.251.103:7001 [cluster] root 17076 16261 0 13:35 pts/3 00:00:08 redis-server 10.9.251.103:7002 [cluster] root 17662 16261 0 15:07 pts/3 00:00:00 grep redis [[email protected] 7002]# kill 17020 17020:signal-handler (1484118485) Received SIGTERM scheduling shutdown... [[email protected] 7002]# 17020:M 11 Jan 15:08:05.200 # User requested shutdown... 17020:M 11 Jan 15:08:05.200 * Calling fsync() on the AOF file. 17020:M 11 Jan 15:08:05.200 * Saving the final RDB snapshot before exiting. 17020:M 11 Jan 15:08:05.219 * DB saved on disk 17020:M 11 Jan 15:08:05.219 * Removing the pid file. 17020:M 11 Jan 15:08:05.219 # Redis is now ready to exit, bye bye... [[email protected] 7000]# redis-trib.rb check 10.9.251.104:7001 >>> Performing Cluster Check (using node 10.9.251.104:7001) M: bf01d4e7da106eaeaa52ccda12b310a59cf3c655 10.9.251.104:7001 slots:10923-16383 (5461 slots) master 1 additional replica(s) S: 832cb8bf04047db470e67db4656d992d1df8c1b2 10.9.251.103:7002 slots: (0 slots) slave replicates bf01d4e7da106eaeaa52ccda12b310a59cf3c655 S: 88645c07a73eb3df4b8598365b0bc07278c31929 10.9.251.104:7002 slots: (0 slots) slave replicates 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 M: 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 10.9.251.103:7000 slots:5461-10922 (5462 slots) master 1 additional replica(s) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [ERR] Not all 16384 slots are covered by nodes. [[email protected] 7000]# redis-cli -c -p 7001 -h 10.9.251.104 10.9.251.104:7001> get name (error) CLUSTERDOWN The cluster is down 10.9.251.104:7001> get age (error) CLUSTERDOWN The cluster is down 10.9.251.104:7001> get addres (error) CLUSTERDOWN The cluster is down 10.9.251.104:7001> get key:001 (error) CLUSTERDOWN The cluster is down 10.9.251.104:7001> set newkey newval (error) CLUSTERDOWN The cluster is down 10.9.251.104:7001>
這種情況還能恢復嗎？答案是肯定的。啟動103:7001。 [[email protected] 7001]# redis-server redis.conf & [1] 17783 [[email protected] 7001]# 17783:M 11 Jan 15:22:07.368 * Node configuration loaded, I'm dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba _._ _.-``__ ''-._ _.-`` `. `_. ''-._ Redis 3.2.4 (00000000/0) 64 bit .-`` .-```. ```\/ _.,_ ''-._ ( ' , .-` | `, ) Running in cluster mode |`-._`-...-` __...-.``-._|'` _.-'| Port: 7001 | `-._ `._ / _.-' | PID: 17783 `-._ `-._ `-./ _.-' _.-' |`-._`-._ `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | http://redis.io `-._ `-._`-.__.-'_.-' _.-' |`-._`-._ `-.__.-' _.-'_.-'| | `-._`-._ _.-'_.-' | `-._ `-._`-.__.-'_.-' _.-' `-._ `-.__.-' _.-' `-._ _.-' `-.__.-'
17783:M 11 Jan 15:22:07.369 # Server started, Redis version 3.2.4 17783:M 11 Jan 15:22:07.369 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect. 17783:M 11 Jan 15:22:07.369 * DB loaded from append only file: 0.000 seconds 17783:M 11 Jan 15:22:07.370 * The server is now ready to accept connections on port 7001 17783:M 11 Jan 15:22:09.370 # Cluster state changed: ok 通過啟動103:7001後，我們再看看叢集中該服務的狀態，103:7001處於master主節點，含有5461個雜湊槽，但無副本。我們啟動104:7000服務後，它會自動變為103:7001的副本。 [[email protected] 7001]# redis-trib.rb check 10.9.251.103:7000 >>> Performing Cluster Check (using node 10.9.251.103:7000) M: 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 10.9.251.103:7000 slots:5461-10922 (5462 slots) master 1 additional replica(s) M: dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba 10.9.251.103:7001 slots:0-5460 (5461 slots) master 0 additional replica(s) S: 832cb8bf04047db470e67db4656d992d1df8c1b2 10.9.251.103:7002 slots: (0 slots) slave replicates bf01d4e7da106eaeaa52ccda12b310a59cf3c655 S: 88645c07a73eb3df4b8598365b0bc07278c31929 10.9.251.104:7002 slots: (0 slots) slave replicates 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 M: bf01d4e7da106eaeaa52ccda12b310a59cf3c655 10.9.251.104:7001 slots:10923-16383 (5461 slots) master 1 additional replica(s) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. 啟動104:7000服務： [[email protected] 7000]# redis-server redis.conf & ... [[email protected] 7002]# redis-trib.rb check 10.9.251.103:7000 >>> Performing Cluster Check (using node 10.9.251.103:7000) M: 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 10.9.251.103:7000 slots:5461-10922 (5462 slots) master 1 additional replica(s) M: dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba 10.9.251.103:7001 slots:0-5460 (5461 slots) master 1 additional replica(s) S: 23719618cb3996b776a5926061fce31be398d68b 10.9.251. 104:7000 slots: (0 slots) slave replicates dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba S: 832cb8bf04047db470e67db4656d992d1df8c1b2 10.9.251.103:7002 slots: (0 slots) slave replicates bf01d4e7da106eaeaa52ccda12b310a59cf3c655 S: 88645c07a73eb3df4b8598365b0bc07278c31929 10.9.251.104:7002 slots: (0 slots) slave replicates 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 M: bf01d4e7da106eaeaa52ccda12b310a59cf3c655 10.9.251.104:7001 slots:10923-16383 (5461 slots) master 1 additional replica(s) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
4、模擬新新增節點 我們在104伺服器上同樣建立服務104:7003。 [[email protected] redis-cluster-test]# pwd /usr/local/redis-cluster-test [[email protected] redis-cluster-test]# ll total 60 drwxr-xr-x. 2 root root 4096 Jan 11 15:29 7000 drwxr-xr-x. 2 root root 4096 Jan 11 14:43 7001 drwxr-xr-x. 2 root root 4096 Jan 11 14:41 7002 [[email protected] redis-cluster-test]# mkdir 7003&cp 7000/redis.conf 7003 [4] 30805 [4]+ Done mkdir 7003 [[email protected] redis-cluster-test]# ll total 64 drwxr-xr-x. 2 root root 4096 Jan 11 15:29 7000 drwxr-xr-x. 2 root root 4096 Jan 11 14:43 7001 drwxr-xr-x. 2 root root 4096 Jan 11 14:41 7002 drwxr-xr-x. 2 root root 4096 Jan 11 15:37 7003 [[email protected] redis-cluster-test]# sed -i "s/7000/7003/g" 7003/redis.conf [[email protected] redis-cluster-test]# cd 7003 [[email protected] 7003]# redis-server redis.conf & ... [[email protected] 7003]# ps -ef|grep redis root 29645 28360 0 13:28 pts/1 00:00:05 redis-server 10.9.251.104:7002 [cluster] root 29801 28360 0 13:44 pts/1 00:00:02 redis-server 10.9.251.104:7001 [cluster] root 30736 28360 0 15:29 pts/1 00:00:01 redis-server 10.9.251.104:7000 [cluster] root 30883 28360 0 15:43 pts/1 00:00:00 redis-server 10.9.251.104:7003 [cluster] root 30887 28360 0 15:43 pts/1 00:00:00 grep redis [[email protected] 7003]# redis-trib.rb check 10.9.251.104:7001 >>> Performing Cluster Check (using node 10.9.251.104:7001) M: bf01d4e7da106eaeaa52ccda12b310a59cf3c655 10.9.251.104:7001 slots:10923-16383 (5461 slots) master 1 additional replica(s) S: 23719618cb3996b776a5926061fce31be398d68b 10.9.251.104:7000 slots: (0 slots) slave replicates dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba S: 832cb8bf04047db470e67db4656d992d1df8c1b2 10.9.251.103:7002 slots: (0 slots) slave replicates bf01d4e7da106eaeaa52ccda12b310a59cf3c655 M: dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba 10.9.251.103:7001 slots:0-5460 (5461 slots) master 1 additional replica(s) S: 88645c07a73eb3df4b8598365b0bc07278c31929 10.9.251.104:7002 slots: (0 slots) slave replicates 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 M: 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 10.9.251.103:7000 slots:5461-10922 (5462 slots) master 1 additional replica(s) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. 可以看104:7003已啟動，但是它現在還不是叢集的一部分，怎辦？ add-node 命令：新增新節點104:7003 到叢集。 [[email protected] 7003]# redis-trib.rb add-node 10.9.251.104:7003 10.9.251.104:7000 >>> Adding node 10.9.251.104:7003 to cluster 10.9.251.104:7000 >>> Performing Cluster Check (using node 10.9.251.104:7000) S: 23719618cb3996b776a5926061fce31be398d68b 10.9.251.104:7000 slots: (0 slots) slave replicates dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba S: 88645c07a73eb3df4b8598365b0bc07278c31929 10.9.251.104:7002 slots: (0 slots) slave replicates 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 M: dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba 10.9.251.103:7001 slots:0-5460 (5461 slots) master 1 additional replica(s) S: 832cb8bf04047db470e67db4656d992d1df8c1b2 10.9.251.103:7002 slots: (0 slots) slave replicates bf01d4e7da106eaeaa52ccda12b310a59cf3c655 M: 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 10.9.251.103:7000 slots:5461-10922 (5462 slots) master 1 additional replica(s) M: bf01d4e7da106eaeaa52ccda12b310a59cf3c655 10.9.251.104:7001 slots:10923-16383 (5461 slots) master 1 additional replica(s) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. >>> Send CLUSTER MEET to node 10.9.251.104:7003 to make it join the cluster. [OK] New node added correctly. [[email protected] 7003]# 30883:M 11 Jan 15:50:28.187 # IP address for this node updated to 10.9.251.104 30883:M 11 Jan 15:50:33.212 # Cluster state changed: ok [[email protected] 7003]# redis-trib.rb check 10.9.251.104:7001 >>> Performing Cluster Check (using node 10.9.251.104:7001) M: bf01d4e7da106eaeaa52ccda12b310a59cf3c655 10.9.251.104:7001 slots:10923-16383 (5461 slots) master 1 additional replica(s) M: 624ef83bad5df4c7091c547afc336e6674a82f92 10.9.251. 104:7003 slots: (0 slots) master 0 additional replica(s) S: 23719618cb3996b776a5926061fce31be398d68b 10.9.251.104:7000 slots: (0 slots) slave replicates dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba S: 832cb8bf04047db470e67db4656d992d1df8c1b2 10.9.251.103:7002 slots: (0 slots) slave replicates bf01d4e7da106eaeaa52ccda12b310a59cf3c655 M: dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba 10.9.251.103:7001 slots:0-5460 (5461 slots) master 1 additional replica(s) S: 88645c07a73eb3df4b8598365b0bc07278c31929 10.9.251.104:7002 slots: (0 slots) slave replicates 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 M: 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 10.9.251.103:7000 slots:5461-10922 (5462 slots) master 1 additional replica(s) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. 我們看下叢集狀態可知，現在新加的節點104:7003作為master主節點，但其下並沒有分配雜湊槽也沒有副本。好吧，讓我們先搞下雜湊槽。 4.1 為新增節點分配雜湊槽 4.1.1 給節點分配指定大小雜湊槽（reshard） [[email protected] 7003]# redis-trib.rb reshard 10.9.251.104:7000 >>> Performing Cluster Check (using node 10.9.251.104:7000) S: 23719618cb3996b776a5926061fce31be398d68b 10.9.251.104:7000 slots: (0 slots) slave replicates dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba S: 88645c07a73eb3df4b8598365b0bc07278c31929 10.9.251.104:7002 slots: (0 slots) slave replicates 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 M: dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba 10.9.251.103:7001 slots:0-5460 (5461 slots) master 1 additional replica(s) S: 832cb8bf04047db470e67db4656d992d1df8c1b2 10.9.251.103:7002 slots: (0 slots) slave replicates bf01d4e7da106eaeaa52ccda12b310a59cf3c655 M: 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 10.9.251.103:7000 slots:5461-10922 (5462 slots) master 1 additional replica(s) M: bf01d4e7da106eaeaa52ccda12b310a59cf3c655 10.9.251.104:7001 slots:10923-16383 (5461 slots) master 1 additional replica(s) M: 624ef83bad5df4c7091c547afc336e6674a82f92 10.9.251.104:7003 slots: (0 slots) master 0 additional replica(s) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. 詢問劃分多大雜湊槽給目標節點： How many slots do you want to move (from 1 to 16384) ? 4096 詢問哪個節點接收劃分的雜湊槽： What is the receiving node ID? 624ef83bad5df4c7091c547afc336e6674a82f92 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. 詢問劃分的雜湊槽來源的節點：（即源節點） Source node #1:all ... Do you want to proceed with the proposed reshard plan (yes/no)? yes ...
ok，現在新節點有了雜湊槽了，可用於接收儲存叢集的資料了。 [[email protected] 7003]# redis-trib.rb check 10.9.251.104:7001 >>> Performing Cluster Check (using node 10.9.251.104:7001) M: bf01d4e7da106eaeaa52ccda12b310a59cf3c655 10.9.251.104:7001 slots:12288-16383 (4096 slots) master 1 additional replica(s) M: 624ef83bad5df4c7091c547afc336e6674a82f92 10.9.251. 104:7003 slots:0-1364,5461-6826,10923-12287 (4096 slots) master 0 additional replica(s) S: 23719618cb3996b776a5926061fce31be398d68b 10.9.251.104:7000 slots: (0 slots) slave replicates dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba S: 832cb8bf04047db470e67db4656d992d1df8c1b2 10.9.251.103:7002 slots: (0 slots) slave replicates bf01d4e7da106eaeaa52ccda12b310a59cf3c655 M: dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba 10.9.251.103:7001 slots:1365-5460 (4096 slots) master 1 additional replica(s) S: 88645c07a73eb3df4b8598365b0bc07278c31929 10.9.251.104:7002 slots: (0 slots) slave replicates 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 M: 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 10.9.251.103:7000 slots:6827-10922 (4096 slots) master 1 additional replica(s) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
假如 新增的節點104:7003處理能力強些，可以將處理能力較弱的103:7000上的槽多分些給它。如下： [[email protected] 7003]# redis-trib.rb reshard 10.9.251.104:7000 >>> Performing Cluster Check (using node 10.9.251.104:7000) S: 23719618cb3996b776a5926061fce31be398d68b 10.9.251.104:7000 slots: (0 slots) slave replicates dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba S: 88645c07a73eb3df4b8598365b0bc07278c31929 10.9.251.104:7002 slots: (0 slots) slave replicates 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 M: dc663f990787a87ae12b97a0b1e3c9ee2e2e65ba 10.9.251.103:7001 slots:1365-5460 (4096 slots) master 1 additional replica(s) S: 832cb8bf04047db470e67db4656d992d1df8c1b2 10.9.251.103:7002 slots: (0 slots) slave replicates bf01d4e7da106eaeaa52ccda12b310a59cf3c655 M: 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 10.9.251.103:7000 slots:6827-10922 (4096 slots) master 1 additional replica(s) M: bf01d4e7da106eaeaa52ccda12b310a59cf3c655 10.9.251.104:7001 slots:12288-16383 (4096 slots) master 1 additional replica(s) M: 624ef83bad5df4c7091c547afc336e6674a82f92 10.9.251. 104:7003 slots:0-1364,5461-6826,10923-12287 (4096 slots) master 0 additional replica(s) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. How many slots do you want to move (from 1 to 16384)? 5120 What is the receiving node ID? 624ef83bad5df4c7091c547afc336e6674a82f92 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.
來源於 103:7000節點id的槽： Source node #1: 4b0a1103f4ede0b7c2b77fb0f25f1d95afd80fb2 Source node #2:done ... Do you want to proceed with the proposed reshard plan (yes/no)? yes ... [[email protected] 7003]# redis-trib.rb check 10.9.251.104:7001 >>> Performing Cluster Check (using node 10.9.251.104:7001) M: bf01d4e7da106eaeaa52ccda12b310a59cf3c655 10.9.251.104:7001 slots:12288-16383 (4096 slots) master 1 additional replica(s) M: 624ef83bad5df4c7091c547afc336e6674a82f92 10.9.251. 104:7003 slots:0-1364,5461-12287 (8192 slots) master 1 additional replica(s) S: 23719618cb3996b776a5926061fce31be398d68b 10.9.251.104:7000 slots: (0 slots) slave