sandeep-mst opened a new pull request, #25067:
URL: https://github.com/apache/pulsar/pull/25067
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<!-- Either this PR fixes an issue, -->
Fixes #25058
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### Motivation
<!-- Explain here the context, and why you're making that change. What is
the problem you're trying to solve. -->
WatchTask of Zookeeper
[writableBookies](https://github.com/apache/bookkeeper/blob/2c5d98ebbe1ff8e935c4efd29aa92f37341452ec/bookkeeper-server/src/main/java/org/apache/bookkeeper/discover/ZKRegistrationClient.java#L383)
has two listeners related to rackAwareness attached to it.
[ZkBookieRackAffinityMapping](https://github.com/apache/pulsar/blob/82237d3684fe506bcb6426b3b23f413422e6e4fb/pulsar-broker-common/src/main/java/org/apache/pulsar/zookeeper/ZkBookieRackAffinityMapping.java)
which extends
[BookieRackAffinityMapping](https://github.com/apache/pulsar/blob/efa5e8b04018356447ec1744c6e083430e8e1f05/pulsar-broker-common/src/main/java/org/apache/pulsar/bookie/rackawareness/BookieRackAffinityMapping.java)
and
[RackawareEnsemblePlacementPolicy](https://github.com/apache/bookkeeper/blob/fc981ba04bae126afe3452b76006e80487cc9d84/bookkeeper-server/src/main/java/org/apache/bookkeeper/client/RackawareEnsemblePlacementPolicy.java)
which uses the ZkBookieRackAffinityMapping to resolve the network location.
If the listeners are called in the order of RackAwareEnsemblePlacementPolicy
and then BookieRackAffinityMapping, the bookies in the ensemblePolicy are
initially assigned to the `/default-rack` and stay there until there is a new
ZKEvent on the list of writable bookies. We need to notify the ensemblePolicy
after rack info is updated on the BookieRackAffinityMapping.
### Modifications
<!-- Describe the modifications you've done. -->
1. Updated BookieRackAffinityMapping listener to notify
EnsemblePlacementPolicy onBookieRackChange after completing it's execution.
2. Added BookieRackAffinityMappingTest to replicate and make sure the fix
works.
### Verifying this change
- [x] Make sure that the change passes the CI checks.
This change added tests and can be verified as follows:
-
*org.apache.pulsar.bookie.rackawareness.BookieRackAffinityMappingTest#testZKEventListenersOrdering*
### Does this pull request potentially affect one of the following parts:
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- [ ] Dependencies (add or upgrade a dependency)
- [ ] The public API
- [ ] The schema
- [ ] The default values of configurations
- [ ] The threading model
- [ ] The binary protocol
- [ ] The REST endpoints
- [ ] The admin CLI options
- [ ] The metrics
- [ ] Anything that affects deployment
### Documentation
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- [ ] `doc` <!-- Your PR contains doc changes. -->
- [ ] `doc-required` <!-- Your PR changes impact docs and you will update
later -->
- [x] `doc-not-needed` <!-- Your PR changes do not impact docs -->
- [ ] `doc-complete` <!-- Docs have been already added -->
### Matching PR in forked repository
PR in forked repository: <!-- ENTER URL HERE -->
https://github.com/cognitree/pulsar/pull/28
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