How to Diagnose Frequent Full GC in Production Systems? (Second Interview at Taobao)

The article explains why Full GC should be minimized, defines normal versus abnormal GC frequencies, outlines the root causes of Full GC, and provides a step‑by‑step troubleshooting workflow with concrete code snippets, monitoring commands and real‑world examples for Java backend engineers.

Full GCGarbage CollectionJVM Performance

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How to Diagnose Frequent Full GC in Production Systems? (Second Interview at Taobao)

HelloTech

May 10, 2024 · Backend Development

Root Cause Analysis and Optimization of G1GC Pauses Caused by StringTable Growth in Java Services

The investigation revealed that G1GC pauses were caused by uncontrolled growth of the JVM StringTable, triggered by Jackson’s InternCache interning countless random JSON field names, and was mitigated by enlarging the young generation, disabling field‑name interning, tuning G1 parameters, and monitoring StringTable size.

GC tuningJSON interningJVM Performance

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Root Cause Analysis and Optimization of G1GC Pauses Caused by StringTable Growth in Java Services