We are using redis version 5.x, and using sentinel based architecture.
Below is the setup
N1 got crashed , and due to failover N3 was promoted as a new master. After sometime when N1 was recovered & joined the setup/cluster as slave it requested for a full re-synchronization from N3(present master) due to which BGSave was invoked.
During this process any request on master , was giving below error:
org.springframework.data.redis.connection.RedisPipelineException: Pipeline contained one or more invalid commands; nested exception is org.springframework.dao.InvalidDataAccessApiUsageException: READONLY You can't write against a read only replica.; nested exception is redis.clients.jedis.exceptions.JedisDataException: READONLY You can't write against a read only replica.
We have few queries around this
1. Are we getting this error because master was busy in serving any other request?
2. Is there a configuration we can do so that if another slave is already connected then new node should do sync from existing slave?
3. Is this the expected behaviour?
Thanks in advance.