sijie opened a new pull request #5067: [bookkeeper] Don't return DEFAULT_RACK if ZkBookieRackAffinityMapping can't resolve network location URL: https://github.com/apache/pulsar/pull/5067 <!-- ### Contribution Checklist - Name the pull request in the form "[Issue XYZ][component] Title of the pull request", where *XYZ* should be replaced by the actual issue number. Skip *Issue XYZ* if there is no associated github issue for this pull request. Skip *component* if you are unsure about which is the best component. E.g. `[docs] Fix typo in produce method`. - Fill out the template below to describe the changes contributed by the pull request. That will give reviewers the context they need to do the review. - Each pull request should address only one issue, not mix up code from multiple issues. - Each commit in the pull request has a meaningful commit message - Once all items of the checklist are addressed, remove the above text and this checklist, leaving only the filled out template below. **(The sections below can be removed for hotfixes of typos)** --> *Motivation* Different placement policy has different default rack information. For example, the default rack for `RackAware` is `/default-rack` and the default rack for `RegionAware` is `/default-region/default-rack`. If we return the wrong default rack, it can potentially cause inconsistent network locations inserted to the network topology and causing the following errors. ``` 15:36:30.083 [BookKeeperClientScheduler-OrderedScheduler-0-0] ERROR org.apache.bookkeeper.net.NetworkTopologyImpl - Error: can't add leaf node <Bookie:1.1.1.2:3181> at depth 2 to topology: Number of racks: 1 Expected number of leaves:1 /sh/rack1/1.1.1.1:3181 15:36:30.083 [BookKeeperClientScheduler-OrderedScheduler-0-0] ERROR org.apache.bookkeeper.client.RackawareEnsemblePlacementPolicyImpl - Unexpected exception while handling joining bookie 1.1.1.2:3181 org.apache.bookkeeper.net.NetworkTopologyImpl$InvalidTopologyException: Invalid network topology. You cannot have a rack and a non-rack node at the same level of the network topology. ```
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