HBASE-30335 Seed master flushedSequenceIdByRegion with openSeqNum on region OPEN (branch-2) - #8736
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…region OPEN Backport of apache#8584 to branch-2. - ServerManager.reportRegionOpen(regionInfo, openSeqNum) seeds the master's flushed-sequence cache via merge(openSeqNum, Math::max); called from AssignmentManager on region OPEN. - updateLastFlushedSequenceIds now uses atomic compute() so a stale in-flight heartbeat cannot clobber the OPEN seed with a lower value. - Tests: new TestServerManager; TestGetLastFlushedSequenceId covers the OPEN seed; AbstractTestDLS#makeWAL respects the openSeqNum invariant. The TestMaster#testFlushedSequenceIdPersistLoad change from master is not applicable: flushed sequence id persistence does not exist on branch-2.
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virajjasani
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October 5, 2026 19:10
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Backport of #8584 to
branch-2(JIRA: HBASE-30335).Problem
The master's
flushedSequenceIdByRegionis only updated by periodic RegionServer heartbeats. Right after a region OPEN the entry is absent or stale, soServerManager.getLastFlushedSequenceIdcan returnNO_SEQNUM(or an old value) andWALSplittertreats already-durable edits as unflushed. If the source RS of a graceful move crashes before the next heartbeat, SCP produces orphanedrecovered.edits, which later block merge/split and leave regions stuck in RIT.Change
ServerManager.reportRegionOpen(regionInfo, openSeqNum)seeds the cache withmerge(openSeqNum, Math::max);AssignmentManagercalls it on region OPEN.updateLastFlushedSequenceIdsnow uses atomiccompute()instead of get-then-put, so a stale in-flight heartbeat cannot overwrite the OPEN seed with a lower value.Tests
TestServerManager(seed, monotonicity, concurrent stale-heartbeat race).TestGetLastFlushedSequenceId#testFlushedSequenceIdSeededOnRegionOpen; existing test updated for the new invariant.AbstractTestDLS#makeWALaligns synthetic WAL seqids withopenSeqNum.Backport notes
TestGetLastFlushedSequenceId: kept branch-2'sHMaster#getLastSequenceId/MiniHBaseClusterAPIs.TestMaster#testFlushedSequenceIdPersistLoadchange is dropped — flushed-seqid persistence does not exist on branch-2.Verification (local, JDK17,
-Dhadoop.profile=3.0)mvn -pl hbase-server test -Dtest=TestServerManager,TestGetLastFlushedSequenceId,TestDLSFSHLog,TestDLSAsyncFSWAL→ Tests run: 11, Failures: 0, Errors: 0mvn -pl hbase-server spotless:check→ BUILD SUCCESS