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This article mainly explains "netty how to solve empty polling bug". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "netty how to solve empty polling bug".

Selector is still awakened without a result.

Result in an empty poll, cpu100%

Netty solution:

Define the current time currentTimeNanos first.

Then calculate a minimum time timeoutMillis for execution.

Do a + + operation on selectCnt every time.

Determine that if the minimum time for execution is reached, the seletCnt is reset to 1.

Once the SELECTOR_AUTO_REBUILD_THRESHOLD threshold is reached, the selector needs to be rebuilt to solve this problem.

This threshold defaults to 512.

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