ExecutorCompletionService

Selected Java Interview Questions

Aug 1, 2022 · Backend Development

Root Cause Analysis of a Backend Out‑Of‑Memory Incident and Proper Use of ExecutorCompletionService

The article analyzes a production outage caused by misuse of ExecutorCompletionService, explains why missing take/poll leads to memory leaks, demonstrates correct and incorrect Java code examples, compares ExecutorService with ExecutorCompletionService, and provides practical guidelines to avoid similar OOM problems in backend services.

ConcurrencyExecutorCompletionServiceJava

0 likes · 11 min read

Root Cause Analysis of a Backend Out‑Of‑Memory Incident and Proper Use of ExecutorCompletionService

Top Architect

Jul 22, 2022 · Backend Development

Understanding ExecutorCompletionService: Root Cause Analysis and Best Practices

This article analyzes a production outage caused by misuse of ExecutorCompletionService, explains the underlying Java concurrency mechanisms, compares it with ExecutorService, provides correct code examples, and offers practical guidelines to avoid memory leaks and improve backend reliability.

ConcurrencyExecutorCompletionServiceJava

0 likes · 12 min read

Understanding ExecutorCompletionService: Root Cause Analysis and Best Practices

Cognitive Technology Team

Jul 9, 2022 · Backend Development

Avoiding OOM When Using java.util.concurrent.ExecutorCompletionService

The article explains how submitting tasks to ExecutorCompletionService without retrieving their results causes the internal unbounded LinkedBlockingQueue to retain Future objects, leading to memory leaks and OutOfMemoryError, and demonstrates the correct usage patterns to prevent this issue.

ConcurrencyExecutorCompletionServiceJava

0 likes · 6 min read

Avoiding OOM When Using java.util.concurrent.ExecutorCompletionService