A joblib backend that enables Python parallel computing tasks to run on Apache Spark clusters.
Joblib Apache Spark Backend is a Python library that provides an Apache Spark backend for joblib, enabling distributed parallel computing on Spark clusters. It allows Python applications using joblib for parallelism to scale their computations across multiple Spark worker nodes, particularly useful for machine learning tasks with scikit-learn.
Data scientists and engineers who use joblib for parallel computing in Python and want to scale their workloads across Apache Spark clusters, especially when working with scikit-learn for machine learning.
It provides a straightforward way to leverage Spark's distributed computing power without rewriting existing joblib-based code, offering horizontal scaling for parallel Python workloads with minimal integration effort.
Joblib Apache Spark Backend
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With simple registration via register_spark(), existing joblib code can leverage Spark without significant changes, as shown in the example using parallel_backend.
Distributes tasks across Apache Spark worker nodes, enabling horizontal scaling for parallel computing on large datasets.
Works directly with scikit-learn's parallel_backend for parallelizing model training and cross-validation, demonstrated with cross_val_score.
Uses the familiar joblib context manager pattern, making it easy for users already accustomed to joblib to adopt.
Admits limitations in the README, such as no parallel inference for models or feature engineering, restricting its use for full ML pipelines.
Depends on PySpark and a running Spark cluster, which involves setup, configuration, and maintenance efforts.
For certain scikit-learn algorithms like RandomForestClassifier, the spark backend fails for inference due to internal backend binding.
The Spark backend introduces latency and resource allocation that may degrade performance for small or fast-running parallel tasks compared to local backends.