v3: Add back zlib support using zlib-rs

[marvin-j97]

[harshithsaiv]

Hi @marvin-j97, I’d like to work on this issue.
I have some prior experience implementing Write-Ahead Logs in a KV-store structure, and I’d like to apply that knowledge here while learning more about LSM internals.

Would it be okay if I start working on this? Also, if you have any specific guidelines or design considerations in mind, I’d be happy to follow them.

[marvin-j97]

Hi @marvin-j97, I’d like to work on this issue. I have some prior experience implementing Write-Ahead Logs in a KV-store structure, and I’d like to apply that knowledge here while learning more about LSM internals.

Would it be okay if I start working on this? Also, if you have any specific guidelines or design considerations in mind, I’d be happy to follow them.

I think this issue is pretty straightforward: the Compression enum needs to be extended by Zlib(level). Note the 3.0.0 branch.

And then the match patterns where (de)compression happens needs to be extended as well.

I think using zlib-rs itself is not really easy, so I think a wrapper like the flate2 crate needs to be used.

All that should be put behind a feature flag zlib.

[harshithsaiv]

Hi @marvin-j97, I’ve opened PR #155 adding zlib-rs support via flate2.
I’ve also raised a question in the PR description would appreciate your feedback when you have a chance. Thanks!