Increase REDIS key size more than 512 MB

[boseabhishek]

Hello All,

I am pretty new to REDIS. As per the official documentation(https://redis.io/topics/data-types-intro#redis-keys), we see that:
 - The maximum allowed key size is 512 MB.

I have seen some discussion around increasing the limit but didn't quite understand if we had a definite answer.

[kpbird]

Hello,

512 MB key size is more than sufficient. Do you have any specific use case where you need a key size more than 512 MB?

[soloestoy]

Hi, this is already supported since 5.0 using configuration proto-max-bulk-len, see more details in redis.conf

[oranagra]

@soloestoy i don't think that's right (yet?).
proto-max-bulk-len allows bigger protocol bulks, but that's mainly helping big RESTORE commands (ones carrying a huge hash or list).

it does indeed enables you to create big strings with SET / HSET, but there are some places with extra checks like SETRANGE and APPEND that use this:

static int checkStringLength(client *c, long long size) {
    if (size > 512*1024*1024) {

[soloestoy]

@oranagra sorry I missed it, seems we need to add a new configuration.

BTW, this remind me about #4633