YoWuwuuuw opened a new pull request, #7753:
URL: https://github.com/apache/incubator-seata/pull/7753
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### Ⅰ. Describe what this PR did
Enhance the Zookeeper registry center with metadata registration and
discovery capabilities based on branch 'gsoc-2025-meta-registry'.
1. **Register and write metadata:** In `register(ServiceInstance)`, the
metadata is serialized into a string and written to the ZK temporary node
`data`. The node path remains `.../registry/zk/{cluster}/{ip:port}`.
2. **Lookup/listen and backfill metadata:** In `lookup` and child node
change callbacks, `getData()` reads the node `data`, parses it into a
`Map<String,String>`, constructs it using
`ServiceInstance.fromStringMap(address, metadata)`, and sends the metadata back
to the calling side.
3. **Prevent metadata loss during reconnection `recover()`:** A new
`REGISTERED_PATH_DATA_MAP` cache is added for `path→data`. When `recover()`
rebuilds the temporary node, it uses the cached `data` to write back, ensuring
metadata consistency.
### Ⅱ. Does this pull request fix one issue?
<!-- If that, add "fixes #xxx" below in the next line, for example, fixes
#97. -->
### Ⅲ. Why don't you add test cases (unit test/integration test)?
### Ⅳ. Describe how to verify it
### Ⅴ. Special notes for reviews
1. **Compatibility:** If getData() fails or the node has no data, it will
fall back to the address instance `InetSocketAddress` only.
2. **Serialization:** Uses lightweight line-based key=value\n text, with
zero dependencies;
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