shibd opened a new pull request #13850:
URL: https://github.com/apache/pulsar/pull/13850
### Motivation
#13663 Flaky-test: org.apache.pulsar.metadata.LockManagerTest.updateValue
The reasons are discussed in detail in this PR(#13725)
This is mainly caused by the callback method of `MetadataStore` and the
concurrent access of the notification thread to the `MetadataCache#refresh`.
We should queue them in the `metada-store` thread pool(SingleThread)
### Modifications
1. In `AbstractMetadataStore` method, all future callback opt are executed
through `metada-store` thread.
2. In `ZKMetadataStore#batchOperation`, `zkc.multi` callback opt are
executed through `metada-store` thread.
### Documentation
- [ x] `no-need-doc`
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