[server] Support altering table.log.ttl table option

[Kaixuan-Duan]

Purpose

Linked issue: close #3231

Brief change log

• Add ConfigOptions.TABLE_LOG_TTL.key() to FlussConfigUtils.ALTERABLE_TABLE_OPTIONS so the validator no longer rejects ALTER on this option.
• Change RemoteLogTablet#ttlMs from final to volatile and add getTtlMs() / updateTtlMs(long) so the remote-log expiration check can observe the new value without recreating the tablet.
• Add Replica#updateLogTtlMs(long) which looks up the corresponding RemoteLogTablet via RemoteLogManager and applies the new TTL, guarded by an IllegalStateException fallback for the case where the tablet has not been registered yet.
• Extend ReplicaManager#updateReplicaTableConfig to collect a tableIdToLogTtlMs map from the metadata diff and dispatch updateLogTtlMs to each affected replica, mirroring how table.log.tiered.local-segments is already handled.

Tests

./mvnw -pl fluss-client,fluss-server -am test \
-Dtest='FlussAdminITCase#testAlterTableLogTtl,'\
'RemoteLogTabletTest,'\
'RemoteLogManagerTest,'\
'RemoteLogTTLTest' \
-DfailIfNoTests=false

API and Format

Documentation

[Copilot]

Pull request overview

Enables ALTER TABLE ... SET ('table.log.ttl' = ...) by allowing the option through config validation and propagating updated TTL values into the server-side remote-log expiration logic without requiring tablet recreation.

Changes:

• Allow table.log.ttl to be altered by adding it to FlussConfigUtils.ALTERABLE_TABLE_OPTIONS.
• Make RemoteLogTablet TTL mutable/visible across threads and add update/access methods; wire TTL updates through Replica and ReplicaManager.
• Add/extend tests to validate TTL alteration persistence and runtime effect on remote-log expiration.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
fluss-common/src/main/java/org/apache/fluss/config/FlussConfigUtils.java	Allows table.log.ttl to pass ALTER-table option validation.
fluss-server/src/main/java/org/apache/fluss/server/log/remote/RemoteLogTablet.java	Makes TTL mutable (volatile) and adds TTL getter/updater for runtime expiration decisions.
fluss-server/src/main/java/org/apache/fluss/server/replica/Replica.java	Adds updateLogTtlMs to apply TTL changes to the associated RemoteLogTablet.
fluss-server/src/main/java/org/apache/fluss/server/replica/ReplicaManager.java	Propagates TTL values from metadata updates to online replicas.
fluss-server/src/test/java/org/apache/fluss/server/log/remote/RemoteLogTabletTest.java	Adds unit coverage for TTL update behavior affecting expiration results.
fluss-server/src/test/java/org/apache/fluss/server/log/remote/RemoteLogManagerTest.java	Adds integration-style test ensuring replica-driven TTL updates reach RemoteLogTablet.
fluss-client/src/test/java/org/apache/fluss/client/admin/FlussAdminITCase.java	Adds IT coverage verifying ALTER persists TTL into TableInfo and reset reverts to default.

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[Kaixuan-Duan]

@luoyuxia I have addressed the feedback. PTAL