To logging missed key data.

[Jinoos]

Hi every redis users,

I'm finding a good way to see exact missed key data.

Actually, I'm building LRU cache cluster, and use Redis for cache storage. After then, I want to moniter Keys which are missed from DB.

I can see "keyspace_misses" in result of INFO command, But it doesn't mean which key is. Please share a better idea for this.


Thanks
Jinoos


[Josiah Carlson]

Redis does not log information about key misses aside from the count. If you want additional functionality, you will need to either build it into your client, or you will need to modify Redis to offer the feature.

 - Josiah

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[Marc Gravell]

Or write a Lua script that does a "get, and do something on a miss" - personally I'd suggest an appropriate "something" might be to publish an event, similar to the keyspace notification events.

Marc

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Regards,

Marc

[Jinoos Lee]

Thanks Josiah and Marc for your response,

> Redis does not log information about key misses aside from the count. If you want additional functionality, you will need to either build it into your client, or you will need to modify Redis to offer the feature.

The system what I'm trying to build will serve to many of clients, and they may use general client library most of the time. So, It may not easy to put custom function each of the lilbraries unfortunatelly.

> Or write a Lua script that does a "get, and do something on a miss" - personally I'd suggest an appropriate "something" might be to publish an event, similar to the keyspace notification events.

I'm digging the "keyspace notification event", but the notification event seems not contain missing command. Would you please provide any example paper or instruction to me if passible? Sorry I'm not much familiar with Lua script, too. :(

Thanks
Jinoos

[Jinoos Lee]

Hi Josiah and Marc,

I have tried to implement logging miss keys base on redis-2.8.9 version.

  - https://github.com/jinoos/redis-2.8.9-misskeylog

You can see what codes have been changed below commit.

  - https://github.com/jinoos/redis-2.8.9-misskeylog/commit/cd896f8c0e3fff5901429db7f043f36adbeaee78

It's pretty working well, and simply check by nc unix command as below.

  ]$ nc -U /tmp/redis.misskeylog.sock

In my case, this feature ls very useful to monitor what keys are missing in DB now.

Would you please check the concept and feature? Although the codes much ugly. I hope, Redis code contains this kind of feature, then I can avoid pay effort for patching every release myself. :D.

Thanks
Jinoos

[fcig...@imallbrands.com]

Hi Jinoosm

I've ported your change on version 4.0 in case anyone still need this change.

https://github.com/lidio601/keyspace-key-hit-miss

There is also a Docker automated build of version 4.0 on alpine here: https://hub.docker.com/r/lidio601/redis/