Cassandra Troubleshooting Guides

Cassandra errors can surface at the worst possible moments — during deployments, under peak traffic, or in the middle of critical operations. This collection of 3 troubleshooting guides covers the most common Cassandra issues encountered in database management, queries, and data operations. Each article walks through specific error messages with step-by-step diagnosis, root cause analysis, and verified solutions. Whether you're dealing with configuration problems, authentication failures, timeout errors, or unexpected behavior, these guides are designed to get you from error message to resolution as quickly as possible. Solutions are backed by official documentation and real-world production experience.

Error Quick Reference

Article	Description
Cassandra 'Connection Refused' on Port 9042: Complete Troubleshooting Guide	Fix Cassandra connection refused errors on port 9042. Diagnose OOM kills, misconfigured listen_address, firewall blocks, slow queries, and data corruption with
Fixing Cassandra 'Connection Refused', OOM, and Slow Queries: A Complete Guide	Comprehensive troubleshooting guide to resolve Cassandra connection refused, out of memory (OOM), slow queries, timeouts, and SSTable corruption errors.
Resolving Cassandra Read Timeout During Query: LOCAL_QUORUM, ONE, and SERIAL	Comprehensive guide to fixing Cassandra read timeouts (ReadTimeoutException) at LOCAL_QUORUM, ONE, and CAS SERIAL consistencies. Diagnose tombstones, GC pauses,