Qunar Tech Salon

Nov 6, 2018 · Operations

Analyzing TCP Connection States and Resolving TIME_WAIT, CLOSE_WAIT, and SYN_RECV Issues in a Java/Tomcat/HBase System

This article walks through a real‑world incident where sudden traffic drops were traced to abnormal TCP states—TIME_WAIT, CLOSE_WAIT, and SYN_RECV—by examining monitoring data, explaining the TCP handshake, reviewing relevant kernel parameters, and debugging Java/ZooKeeper/HBase code to identify and fix the root cause.