Support large size index.json (20GB +)
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enhancement
- Dominant language
- Python
- Stars
- 1.6k
- Forks
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Description
🚀 Feature Request
Large index.json are slow to load. Currently, I am trying to increase shard size, so stream.py#L473 will be faster (hopefully).
Motivation
These two steps are very slow for large index.json files.
https://github.com/mosaicml/streaming/blob/main/streaming/base/stream.py#L461
and
https://github.com/mosaicml/streaming/blob/main/streaming/base/stream.py#L473
especially with large scale dataset (e.g, Billion same).
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reading streaming/base/stream.py around lines 461 and 473 and measure which index.json operations become slow at 20GB or larger. Define a streaming or sharding approach that avoids the current bottleneck, then verify that large index.json files can be processed efficiently without changing the dataset behavior.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- data-engineering
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100