fsspec / fsspec/kerchunk

Avoiding metadata bloat caused by many long URLs

Open
#13 16 comments 0 reactions 0 assignees View on GitHub

Nobody has claimed this yet.

Dominant language
Python
Stars
366
Forks
96
Avg merge
24m
Merged PRs (30d)
1

Description

I woke up this morning wondering whether it would be possible to allow a variable to be defined in the referencefile spec. I'm worried about long s3 (or other) urls bloating the metadata.

If we could do something like:

prefix001='first/superlongurl/that/keeps/going/on/and/on/for/ever/to/some/dir'
prefix002='second/superlongurl/that/keeps/going/on/and/on/for/ever/to/some/dir'

"key1": {
    ["s3://$prefix001/data001.nc", 10000, 100]
  }
"key2": {
    ["s3://$prefix001/data001.nc", 10100, 100]
  }
"key3": {
    ["s3://$prefix002/data001.nc", 10000, 100]
  }
"key4": {
    ["s3://$prefix002/data001.nc", 10100, 100]
  }

we could make the bloat a lot smaller

Contributor guide

No contributing guide indexed for this repository

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reading the referencefile spec and tracing how its metadata entries represent repeated URLs. Define how variables should be declared and expanded in the shown reference format, then verify that repeated long prefixes are stored compactly without changing the resolved references.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
cloud, data
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.