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Posted to issues@kvrocks.apache.org by GitBox <gi...@apache.org> on 2022/09/14 06:27:59 UTC
[GitHub] [incubator-kvrocks] lrb1996 opened a new issue, #874: The requirement of two commands for Kvrocks
lrb1996 opened a new issue, #874:
URL: https://github.com/apache/incubator-kvrocks/issues/874
### Search before asking
- [X] I had searched in the [issues](https://github.com/apache/incubator-kvrocks/issues) and found no similar issues.
### Motivation
I have a requirement which I hope you dear admins can develop it. When we use Redis, we can easily get clear the memory usage of the specific key by using command "memory usage key " as well as the keyspace hits percentage of the specific key by using command "info". **But for Kvrocks, we can't easily get the information by using commands.** In conclusion, i'll appreciate it if you can solve this problem. Looking forward to your reply, thank you!
### Solution
_No response_
### Are you willing to submit a PR?
- [ ] I'm willing to submit a PR!
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[GitHub] [incubator-kvrocks] lrb1996 commented on issue #874: The requirement of two commands for Kvrocks
Posted by GitBox <gi...@apache.org>.
lrb1996 commented on issue #874:
URL: https://github.com/apache/incubator-kvrocks/issues/874#issuecomment-1246558361
>
Thanks for your reply. I know that Kvrocks stores its data in disk instead of the memory, but i think it's also necessary to know the size of the specific key accurately, otherwize it may cause the problem of the high cpu percentage or some other related indexes of machine. I wonder if there's a fast way to know the size of the specific key clearly like Redis.
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[GitHub] [incubator-kvrocks] git-hulk commented on issue #874: The requirement of two commands for Kvrocks
Posted by GitBox <gi...@apache.org>.
git-hulk commented on issue #874:
URL: https://github.com/apache/incubator-kvrocks/issues/874#issuecomment-1247042832
@tanruixiang sure, thanks for your interest. We want a command like Redis [MEMORY USAGE](https://redis.io/commands/memory-usage/) except the usage should be disk space, and as you
said we can use `GetApproximateSizes` to count the approximate size. So what we need to do is:
1. implement a command like `DISK USAGE key` and [SAMPLES count] is no need.
2. Count the value size directly if the key type is a string, or we need to use `GetApproximateSizes` to get the key size with a prefix. The prefix should be composed of key and version since we use the version to identify the live subkeys. I think you can have a look at [How Kvrocks Design Complex Structure On Rocksdb](https://kvrocks.apache.org/docs/Design/design-structure-on-rocksdb) and come back to discuss if you still don't know how to do that.
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[GitHub] [incubator-kvrocks] git-hulk commented on issue #874: The requirement of two commands for Kvrocks
Posted by GitBox <gi...@apache.org>.
git-hulk commented on issue #874:
URL: https://github.com/apache/incubator-kvrocks/issues/874#issuecomment-1246537929
Do you mean the disk space usage of key? Kvrocks stores its data in disk instead of the memory, so the memory usage of key is meaningless for Kvrocks.
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[GitHub] [incubator-kvrocks] git-hulk commented on issue #874: The requirement of two commands for Kvrocks
Posted by GitBox <gi...@apache.org>.
git-hulk commented on issue #874:
URL: https://github.com/apache/incubator-kvrocks/issues/874#issuecomment-1246617890
Thanks for your clarification. It makes sense to export the value size of the specific key, and it should be possible since the RocksDB has a way to get the approximate size with the prefix if my memory serves.
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[GitHub] [incubator-kvrocks] tanruixiang commented on issue #874: The requirement of two commands for Kvrocks
Posted by GitBox <gi...@apache.org>.
tanruixiang commented on issue #874:
URL: https://github.com/apache/incubator-kvrocks/issues/874#issuecomment-1246959036
>
> Thanks for your clarification. It makes sense to export the value size of the specific key, and it should be possible since the RocksDB has a way to get the approximate size with the prefix if my memory serves.
@git-hulk Hi. Maybe u mean `GetApproximateSizes`. I am willing to do this task. Can you give me some guidance?
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[GitHub] [incubator-kvrocks] git-hulk closed issue #874: The requirement of two commands for Kvrocks
Posted by GitBox <gi...@apache.org>.
git-hulk closed issue #874: The requirement of two commands for Kvrocks
URL: https://github.com/apache/incubator-kvrocks/issues/874
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