DEKER™

DEKER™ is pure Python implementation of petabyte-scale highly parallel data storage engine for multidimensional arrays.

DEKER™ name comes from term dekeract, the 10-cube.

DEKER™ was made with the following major goals in mind:

• provide intuitive interface for storing and accessing huge data arrays
• support arbitrary number of data dimensions
• be thread and process safe and as lean on RAM use as possible

DEKER™ empowers users to store and access a wide range of data types, virtually anything that can be represented as arrays, like geospacial data, satellite images, machine learning models, sensors data, graphs, key-value pairs, tabular data, and more.

DEKER™ does not limit your data complexity and size: it supports virtually unlimited number of data dimensions and provides under the hood mechanisms to partition huge amounts of data for scalability.

Features

• Open source under GPL 3.0
• Scalable storage of huge virtual arrays via tiling
• Parallel processing of virtual array tiles
• Own locking mechanism enabling virtual arrays parallel read and write
• Array level metadata attributes
• Fancy data slicing using timestamps and named labels
• Support for industry standard NumPy, Xarray
• Storage level data compression and chunking (via HDF5)

Code and Documentation

Open source implementation of DEKER™ storage engine is published at

• https://github.com/openweathermap/deker

API documentation and tutorials for the current release could be found at

• https://docs.deker.io

Quick Start

Dependencies

Minimal Python version for DEKER™ is 3.10. Supported versions are 3.10 - 3.14.

Note: Python 3.9 is not supported since DEKER™ 1.2.0 (the same applies to deker-tools, deker-local-adapters, deker-server-adapters and deker-shell 1.2.0). If you are on Python 3.9, use deker<1.2.

DEKER™ depends on the following third-party packages:

• numpy >= 1.26 (NumPy 2 is supported)
• attrs >= 23.1.0
• tqdm >= 4.64.1
• psutil >= 5.9.5
• h5py >= 3.11
• hdf5plugin >= 4.0.1

Also please note that for flexibility few internal DEKER™ components are published as separate packages:

• deker-local-adapters
• deker-server-adapters
• deker-tools

Install

To install DEKER™ run:

pip install deker

Please refer to documentation for advanced topics such as running on Apple silicone or using Xarray with DEKER™ API.

First Steps

Now you can write simple script to jump into DEKER™ development:

from deker import Client, ArraySchema, DimensionSchema, TimeDimensionSchema
from datetime import datetime, timedelta, timezone
import numpy as np

# Where all data will be kept
DEKER_URI = "file:///tmp/deker"

# Define 3-dimensional schema with to numeric and one time dimension
dimensions = [
   DimensionSchema(name="y", size=128),
   DimensionSchema(name="x", size=128),
   TimeDimensionSchema(
      name="forecast_dt",
      size=128,
      start_value=datetime.now(timezone.utc),
      step=timedelta(3),
   )
]

# Define array schema with float dtype and dimensions
array_schema = ArraySchema(dtype=float, dimensions=dimensions)

# Instantiate client using context manager
with Client(DEKER_URI) as client:
   # Create collection
   collection = client.create_collection("my_collection", array_schema)
   
   # Create array
   array = collection.create()
   
   # Write some data
   array[:].update(np.ones(shape=array.shape))
   
   # And read the data back
   data = array[:].read()