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Their post isn't very clear on persistence, here's how I read it. 1) Yes, they're using Redis persistence (RDB, AOF, or a Google-written persistence layer, it'

Their post isn't very clear on persistence, here's how I read it. 1) Yes, they're using Redis persistence (RDB, AOF, or a Google-written persistence layer, it's not specified). 2) Basic Tier scales by tearing down the smaller Redis instance and migrating the data (???) to a larger instance. This causes downtime, but not lost data. 3) Standard Tier migrates using replication during scaling, so there's little downtime but if data is in flight at cutover, it could be lost. 4) And "coming soon" you can migrate data in and out of Cloud Memorystore by importing and exporting RDB files.

dudus 9y ago
Why do you think they are using persistence at all, and why do you think Basic Tier doesn't have data loss on scaling? I read it differently. When they say full cache flush doesn't that imply full database flush, I was thinking all data gets wiped on scaling operation.
- nodesocket 9y ago
  Agree I don't think it is persistent. "a full cache flush" represents all data loss to me.
  - dudus 9y ago
    Wouldn't that also imply full data loss on server restarts?
  - panarky 9y ago
    Could be I read this one wrong. There's a Redis command called FLUSHALL that deletes all the data. https://redis.io/commands/flushall https://redis.io/commands/flushall
gopalashok 9y ago
Full disclosure, I'm the product manager for Cloud Memorystore 1) We are not using persistence at all in beta, this is something we are working towards 2) Scaling of basic tier will result in a full cache flush and will cause downtime during the scaling process. 3) That's correct 4) Yes we will be making Import-Export of RDB very soon
- sitkack 9y ago
  > 1) We are not using persistence at all in beta, this is something we are working towards Persistence is a key feature of Redis, it isn't just a fancy memcached. This severely limits the applicability of this offering.
  - jkaplowitz 9y ago
    So does the beta label. :) Both will change in time, from what the PM said.
    - dannyw 9y ago
      It’s like releasing a beta for DNS that doesn’t support IPv6 or CNAMES.
      - rkangel 9y ago
        Exactly. It will be still be useful to some people, it allows them to get something working end-to-end, and then iterate on it to provide the features for more people.
        sitkack 9y ago
        Not providing persistence is setting people up to lose data. It is the wrong move.
- hamandcheese 9y ago
  > We are not using persistence at all in beta Maybe don’t advertise it as a “data store” then.
  - jkaplowitz 9y ago
    Transient caches are still a useful type of data store for better performance... That said, they're noting it as a goal and a beta limitation, so they're not satisfied with pure transience either.

dudus 9y ago

Why do you think they are using persistence at all, and why do you think Basic Tier doesn't have data loss on scaling? I read it differently. When they say full cache flush doesn't that imply full database flush, I was thinking all data gets wiped on scaling operation.

nodesocket 9y ago
Agree I don't think it is persistent. "a full cache flush" represents all data loss to me.
- dudus 9y ago
  Wouldn't that also imply full data loss on server restarts?
- panarky 9y ago
  Could be I read this one wrong. There's a Redis command called FLUSHALL that deletes all the data. https://redis.io/commands/flushall https://redis.io/commands/flushall

gopalashok 9y ago

Full disclosure, I'm the product manager for Cloud Memorystore 1) We are not using persistence at all in beta, this is something we are working towards 2) Scaling of basic tier will result in a full cache flush and will cause downtime during the scaling process. 3) That's correct 4) Yes we will be making Import-Export of RDB very soon

sitkack 9y ago
> 1) We are not using persistence at all in beta, this is something we are working towards Persistence is a key feature of Redis, it isn't just a fancy memcached. This severely limits the applicability of this offering.
- jkaplowitz 9y ago
  So does the beta label. :) Both will change in time, from what the PM said.
  - dannyw 9y ago
    It’s like releasing a beta for DNS that doesn’t support IPv6 or CNAMES.
    - rkangel 9y ago
      Exactly. It will be still be useful to some people, it allows them to get something working end-to-end, and then iterate on it to provide the features for more people.
      - sitkack 9y ago
        Not providing persistence is setting people up to lose data. It is the wrong move.
hamandcheese 9y ago
> We are not using persistence at all in beta Maybe don’t advertise it as a “data store” then.
- jkaplowitz 9y ago
  Transient caches are still a useful type of data store for better performance... That said, they're noting it as a goal and a beta limitation, so they're not satisfied with pure transience either.