FrankChen021 commented on issue #10753:
URL: https://github.com/apache/druid/issues/10753#issuecomment-760939773


   > I am seeing this message now when I restart the broker. Broker log:
   > 
   > ```
   > 2021-01-14T20:56:13,304 WARN [DruidSchema-Cache-0] 
org.apache.druid.client.cache.AbstractRedisCache - Exception pulling items from 
cache
   > redis.clients.jedis.exceptions.JedisClusterException: No way to dispatch 
this command to Redis Cluster because keys have different slots.
   >    at 
redis.clients.jedis.JedisClusterCommand.runBinary(JedisClusterCommand.java:75) 
~[?:?]
   > ```
   
   This is because there's a mget operation trying to get values with different 
keys distributed on different redis slots. Jedis does not support this kind of 
operation. Maybe in the future, we need to replace **jedis** with **lettuce** 
to eliminate this error.
   
   And could you paste the full exception stack so that I could try to 
reproduce it when I have time to repair it ?


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