Tag: distributed-computing

2 articles

Fix: PySpark Not Working — Java Heap Space, Serialization Errors, and OOM Exceptions

Apr 9, 2026

How to fix PySpark errors — Java heap space out of memory, PicklingError cannot serialize, py4j gateway exception, Spark session not found, partition skew causing slow shuffle, lazy evaluation confusion, and collect crashing driver.

python pyspark apache-spark big-data distributed-computing debugging

Fix: Ray Not Working — Cluster Init, Object Store Memory, and Actor Lifecycle Errors

Apr 9, 2026

How to fix Ray errors — ray.init connection refused, object store full ObjectStoreFullError, worker died unexpectedly, serialization PickleError for remote function, Ray Tune trials fail, Ray cluster version mismatch, and actor ReferenceError.

python ray distributed-computing machine-learning ray-tune debugging