Why Does Thread.sleep(0) Appear in RocketMQ Code? Uncovering the Safepoint Trick

The article investigates a mysterious "prevent gc" comment in RocketMQ's source, explains how Thread.sleep(0) forces a JVM safepoint to mitigate long GC pauses, and demonstrates that changing loop counters from int to long eliminates the need for the hack.

Counted LoopJVMJava

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Why Does Thread.sleep(0) Appear in RocketMQ Code? Uncovering the Safepoint Trick