Subscription: preserve topic updates during owner transfer

[Caideyipi]

Description

Problem

An owner-transfer request built its full updated TopicMeta before waiting for the previous owner's lease to expire. While that request was waiting, another ALTER TOPIC could update attributes such as column-filter. A delayed or retried owner-transfer request would then submit its pre-wait snapshot and restore the old attributes.

Fix

• Keep the pre-wait snapshots only for deciding whether an owner lease drain is required.
• After the lease wait completes, rebuild the altered metadata from the latest TopicMeta and merge only the attributes from the owner-transfer request.
• Extract the lease wait into a package-private method so the race can be reproduced deterministically without a real 60-second wait.

Validation

• mvn spotless:apply -pl iotdb-core/confignode
• mvn -pl iotdb-core/confignode -am -Dtest=SubscriptionCoordinatorTest -Dsurefire.failIfNoSpecifiedTests=false test
  • Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
  • Reactor build, Checkstyle, and Spotless succeeded.
• A local run of IoTDBConsensusSubscriptionColumnFilterClusterIT was skipped during cluster setup because the local template contained mixed DataNode classes (NoSuchMethodError: IoTDBConfig.isEnableWhiteList()), before the test body ran.

This PR has:

• been self-reviewed.
  • concurrent write
• added comments explaining the why and intent of the code.
• added unit tests covering the new code path.

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Key changed/added classes

• SubscriptionCoordinator
• SubscriptionCoordinatorTest