szetszwo commented on pull request #420:
URL: https://github.com/apache/incubator-ratis/pull/420#issuecomment-776590929
@errose28 , I just have tried the test. The two new servers, s3 and s4,
have failed to start due to "Unexpected gap in segments" as shown below. It
seems the changes might have some bug.
```
2021-02-10 15:32:49,699 [s4@group-9F91CFE6147C-StateMachineUpdater] ERROR
impl.StateMachineUpdater (StateMachineUpdater.java:run(189)) -
s4@group-9F91CFE6147C-StateMachineUpdater caught a Throwable.
java.lang.IllegalStateException: Unexpected gap in segments:
binarySearch(20) returns -1, segments=[log-21_21]
at
org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogCache$LogSegmentList.purge(SegmentedRaftLogCache.java:340)
at
org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogCache.purge(SegmentedRaftLogCache.java:559)
at
org.apache.ratis.server.raftlog.segmented.SegmentedRaftLog.purgeImpl(SegmentedRaftLog.java:362)
at
org.apache.ratis.server.raftlog.RaftLogBase.purge(RaftLogBase.java:307)
at
org.apache.ratis.server.impl.StateMachineUpdater.takeSnapshot(StateMachineUpdater.java:292)
at
org.apache.ratis.server.impl.StateMachineUpdater.checkAndTakeSnapshot(StateMachineUpdater.java:255)
at
org.apache.ratis.server.impl.StateMachineUpdater.run(StateMachineUpdater.java:178)
at java.lang.Thread.run(Thread.java:748)
2021-02-10 15:32:49,699 [s3@group-9F91CFE6147C-StateMachineUpdater] ERROR
impl.StateMachineUpdater (StateMachineUpdater.java:run(189)) -
s3@group-9F91CFE6147C-StateMachineUpdater caught a Throwable.
java.lang.IllegalStateException: Unexpected gap in segments:
binarySearch(20) returns -1, segments=[log-21_21]
at
org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogCache$LogSegmentList.purge(SegmentedRaftLogCache.java:340)
at
org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogCache.purge(SegmentedRaftLogCache.java:559)
at
org.apache.ratis.server.raftlog.segmented.SegmentedRaftLog.purgeImpl(SegmentedRaftLog.java:362)
at
org.apache.ratis.server.raftlog.RaftLogBase.purge(RaftLogBase.java:307)
at
org.apache.ratis.server.impl.StateMachineUpdater.takeSnapshot(StateMachineUpdater.java:292)
at
org.apache.ratis.server.impl.StateMachineUpdater.checkAndTakeSnapshot(StateMachineUpdater.java:255)
at
org.apache.ratis.server.impl.StateMachineUpdater.run(StateMachineUpdater.java:178)
at java.lang.Thread.run(Thread.java:748)
```
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