lookProcessChain里的chainMap的size现在限制是在6000，有什么办法可以突破吗？

## Issue Description

Type: *bug report* or *feature request*

### Describe what happened (or what feature you want)

### Describe what you expected to happen

### How to reproduce it (as minimally and precisely as possible)

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### Tell us your environment

### Anything else we need to know?

The issue does not name any files, tests, environment, reproduction steps, or expected behavior. Start by locating lookProcessChain and chainMap, then confirm where the 6000-entry limit is defined and what supported behavior should replace or extend it; done is a documented, agreed requirement with reproducible validation.

Written by the indexing model from the issue text.