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https://issues.apache.org/jira/browse/RATIS-2507?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sammi Chen updated RATIS-2507:
------------------------------
Summary: Fix java.lang.IllegalStateException "gap between entries" (was:
Fix java.lang.IllegalStateException: "gap between entries")
> Fix java.lang.IllegalStateException "gap between entries"
> ---------------------------------------------------------
>
> Key: RATIS-2507
> URL: https://issues.apache.org/jira/browse/RATIS-2507
> Project: Ratis
> Issue Type: Bug
> Reporter: Sammi Chen
> Assignee: Sammi Chen
> Priority: Major
> Time Spent: 1h
> Remaining Estimate: 0h
>
> When RaftLog end log index is smaller than last snapshot index during
> RaftServer startup, ratis applied a new entity to raft log before it throws
> out
> {code:java}
> 2026-04-19 17:28:34,546 ERROR
> [om43-server-thread1]-org.apache.ratis.server.raftlog.RaftLog:
> om43@group-A6BF76F23EF4-SegmentedRaftLog: Failed to append (t:11, i:1251979),
> METADATAENTRY(c:1251977)
> java.lang.IllegalStateException: gap between entries 1251979 and 975728
> at org.apache.ratis.util.Preconditions.assertTrue(Preconditions.java:60)
> at
> org.apache.ratis.server.raftlog.segmented.LogSegment.append(LogSegment.java:320)
> at
> org.apache.ratis.server.raftlog.segmented.LogSegment.appendToOpenSegment(LogSegment.java:307)
> at
> org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogCache.appendEntry(SegmentedRaftLogCache.java:556)
> at
> org.apache.ratis.server.raftlog.segmented.SegmentedRaftLog.appendEntryImpl(SegmentedRaftLog.java:414)
> at
> org.apache.ratis.server.raftlog.RaftLogBase.lambda$appendEntry$10(RaftLogBase.java:330)
> at
> org.apache.ratis.server.raftlog.RaftLogSequentialOps$Runner.runSequentially(RaftLogSequentialOps.java:78)
> at
> org.apache.ratis.server.raftlog.RaftLogBase.appendEntry(RaftLogBase.java:330)
> at
> org.apache.ratis.server.raftlog.segmented.SegmentedRaftLog.appendImpl(SegmentedRaftLog.java:456)
> at
> org.apache.ratis.server.raftlog.RaftLogBase.lambda$append$11(RaftLogBase.java:337)
> at
> org.apache.ratis.server.raftlog.RaftLogSequentialOps$Runner.runSequentially(RaftLogSequentialOps.java:69)
> at org.apache.ratis.server.raftlog.RaftLogBase.append(RaftLogBase.java:337)
> at
> org.apache.ratis.server.impl.RaftServerImpl.appendEntriesAsync(RaftServerImpl.java:1532)
> at
> org.apache.ratis.server.impl.RaftServerImpl.appendEntriesAsync(RaftServerImpl.java:1396)
> at
> org.apache.ratis.server.impl.RaftServerProxy.lambda$null$25(RaftServerProxy.java:637)
> at org.apache.ratis.util.JavaUtils.callAsUnchecked(JavaUtils.java:117)
> at
> org.apache.ratis.server.impl.RaftServerImpl.lambda$executeSubmitServerRequestAsync$11(RaftServerImpl.java:825)
> at
> java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
> at java.base/java.lang.Thread.run(Thread.java:840)
> {code}
> A real case, is an OM failed to install snapshot and terminate itself. The on
> disk state machine state(rocksdb) and raft log files are from different
> source, state machine data from leader, raft log files are local, and
> snapshot index get from state machine is bigger than raft log end index,
> which further cause another issue.
> Refer to https://issues.apache.org/jira/browse/HDDS-15103 to get more info.
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