ayushtkn opened a new issue, #4801:
URL: https://github.com/apache/polaris/issues/4801
### Describe the bug
`LocalPolarisMetaStoreManagerFactory.purgeRealms()` removes entries from
`sessionSupplierMap` and `metaStoreManagerMap` but does not remove the
corresponding entry from `entityCacheMap`.
https://github.com/apache/polaris/blob/638247647c27667697675df01d2163043121e656/polaris-core/src/main/java/org/apache/polaris/core/persistence/LocalPolarisMetaStoreManagerFactory.java#L136-L139
This means after a realm is purged and re-bootstrapped,
`getOrCreateEntityCache()` returns the stale cache from the previous realm
lifecycle — containing references to entities that no longer exist.
Additionally, `purgeRealms` is not `synchronized`, unlike the other
map-mutating methods (`bootstrapRealms`, `getOrCreateMetaStoreManager`,
`getOrCreateSession`), creating a potential race with
concurrent reads/writes to the shared maps.
### To Reproduce
_No response_
### Actual Behavior
Returns stale entires post rebootstrap
### Expected Behavior
should return fresh entries after bootstrap
### Additional context
_No response_
### System information
_No response_
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