HDECRBY?

[zzz]

Why isn't there a HDECRBY command?

I have a typically use case of an object that contains 8 numbers, and
4 of them are going to be frequently decremented. An atomic HDECRBY
(similar to DECRBY) would be perfect. Is there any reason that this
command isn't there?

How would you do it with the existing command atomically?

Thanks.

[Andy McCurdy]

You can pass negative values to HINCRBY.

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[Chad Zou]

is HINCRBY atomic? the documentation is unclear

[Dvir Volk]

yes it is. since redis is single threaded, virtually all single commands are atomic.

Dvir Volk

System Architect, DoAT, http://doat.com

[Josiah Carlson]

Correction: all single commands are atomic.

As are all commands performed between a MULTI/EXEC.

- Josiah

[Dvir Volk]

you could argue that bgsave is not.. :)

[Joe Allen]

HINCRBY using a negative number will do the trick.

[Josiah Carlson]

It surely is atomic. Once that bgsave command is executed, nothing
done in Redis can materially affect the dump unless the forked process
dies without writing the file.

Regards,
- Josiah

[Dvir Volk]

yeah I know, it was only a joke dude :)