ZSTD compatibility

[chiragpat1]

Hi,

We want to upgrade ZSTD from v1.4.5 to v1.5.2 after seeing some significant performance improvement in decompression during POC.
Can you please clerify on compatibility?

1. Any compressed data produced by v1.4.5 can be decompressed correctly by decoder v1.5.2.
2. Any compressed data produced by v1.5.2 can be decompressed correctly by decoder v.1.4.5.

[Cyan4973]

Yes.

[chiragpat1]

Thanks!

[chiragpat1]

Opening an issue to know more about it.
which conditions would break the compatibility of above cases?

[Cyan4973]

none ?

do you have any specific example in mind ?

[chiragpat1]

1. Any compressed data produced by v1.4.5 can be decompressed correctly by decoder v1.5.2.
2. Any compressed data produced by v1.5.2 can be decompressed correctly by decoder v.1.4.5.

As you confirmed the compatibility across different version.
Does different version generate the same compressed data? if not, which things can keep it compatible?

[Cyan4973]

Does different version generate the same compressed data?

It can happen. But that's not an objective. Don't expect it.

if not, which things can keep it compatible?

The IETF-registered Zstandard Format .

[terrelln]

Any compressed data produced by v1.4.5 can be decompressed correctly by decoder v1.5.2.
Any compressed data produced by v1.5.2 can be decompressed correctly by decoder v.1.4.5.

Yes.

if not, which things can keep it compatible?

Zstd will always be compatible with older versions.