Redis cluster reshard后,分配给节点的大量非连续插槽

~ redis-3.2.10/src/redis-trib.rb create 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002

然后,我添加了第四个节点,并重新硬化以使时隙分配更加均匀:

~ redis-3.2.10/src/redis-trib.rb add-node 127.0.0.1:7003 127.0.0.1:7000
~ redis-3.2.10/src/redis-trib.rb reshard --timeout 60000  127.0.0.1:7000
...
How many slots do you want to move (from 1 to 16384)? 4096
...
Source node #1:all
...
redis-3.2.10/src/redis-trib.rb check 127.0.0.1:7000
>>> Performing Cluster Check (using node 127.0.0.1:7000)
M: 29fbb7e5f93eac22a224c14d4070139919bb0a5e 127.0.0.1:7000
   slots:1365-5460 (4096 slots) master
   0 additional replica(s)
M: c90c9f590bb48d328f3eed2fc96af3a7d9cb0f25 127.0.0.1:7003
   slots:0-1364,5461-6826,10923-12287 (4096 slots) master
   0 additional replica(s)
M: 970b3145574a4f38bbe10548bf6b80f8fdc2854d 127.0.0.1:7001
   slots:6827-10922 (4096 slots) master
   0 additional replica(s)
M: 2cc0922fcfb3e619b6d733e054dd249a4b6137bf 127.0.0.1:7002
   slots:12288-16383 (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.

>>> Performing Cluster Check (using node 127.0.0.1:7000)
M: 29fbb7e5f93eac22a224c14d4070139919bb0a5e 127.0.0.1:7000
   slots:1365-5460,12288-13652 (5461 slots) master
   0 additional replica(s)
M: 970b3145574a4f38bbe10548bf6b80f8fdc2854d 127.0.0.1:7001
   slots:0-1364,5461-6826,10923-12287,13653-15017 (5461 slots) master
   0 additional replica(s)
M: 2cc0922fcfb3e619b6d733e054dd249a4b6137bf 127.0.0.1:7002
   slots:6827-10922,15018-16383 (5462 slots) master
   0 additional replica(s)
M: c90c9f590bb48d328f3eed2fc96af3a7d9cb0f25 127.0.0.1:7003
   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.

7001节点有4组不同的哈希槽分配给它。在随后的重排之后,哈希槽的这种“碎片”似乎增加了。