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Kerchunk is a library that provides a unified way to represent a variety of
chunked, compressed data formats (e.g. NetCDF, HDF5, GRIB), allowing efficient
access to the data from traditional file systems or cloud object storage. It
also provides a flexible way to create virtual datasets from multiple files. It
does this by extracting the byte ranges, compression information and other
information about the data and storing this metadata in a new, separate object.
This means that you can create a virtual aggregate dataset over potentially many
source files, for efficient, parallel and cloud-friendly in-situ access without
having to copy or translate the originals. It is a gateway to in-the-cloud
massive data processing while the data providers still insist on using legacy
formats for archival storage.
We provide the following things:
- completely serverless architecture
- metadata consolidation, so you can understand a many-file dataset (metadata
plus physical storage) in a single read
- read from all of the storage backends supported by fsspec, including object
storage (s3, gcs, abfs, alibaba), http, cloud user storage (dropbox, gdrive)
and network protocols (ftp, ssh, hdfs, smb...)
- loading of various file types (currently netcdf4/HDF, grib2, tiff, fits,
zarr), potentially heterogeneous within a single dataset, without a need to go
via the specific driver (e.g., no need for h5py)
- asynchronous concurrent fetch of many data chunks in one go, amortizing the
cost of latency
- parallel access with a library like zarr without any locks
- logical datasets viewing many (>~millions) data files, and direct
access/subselection to them via coordinate indexing across an arbitrary number
of dimensions
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