[
https://issues.apache.org/jira/browse/RATIS-2056?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Song Ziyang updated RATIS-2056:
-------------------------------
Description:
java.lang.IllegalStateException: Unexpected gap in segments: binarySearch(5066)
returns -1, segments=[log-6057_6058, log-6059_6060]
at
org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogCache$LogSegmentList.purge(SegmentedRaftLogCache.java:373)
at
org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogCache.purge(SegmentedRaftLogCache.java:614)
at
org.apache.ratis.server.raftlog.segmented.SegmentedRaftLog.purgeImpl(SegmentedRaftLog.java:379)
at org.apache.ratis.server.raftlog.RaftLogBase.purge(RaftLogBase.java:332)
at
org.apache.ratis.server.impl.StateMachineUpdater.takeSnapshot(StateMachineUpdater.java:313)
at
org.apache.ratis.server.impl.StateMachineUpdater.checkAndTakeSnapshot(StateMachineUpdater.java:275)
at
org.apache.ratis.server.impl.StateMachineUpdater.run(StateMachineUpdater.java:192)
at java.base/java.lang.Thread.run(Thread.java:834)
# This server was recently added to the group, with a snapshot (index=6056)
installed from the leader.
# It then applied some new logs and formed log segments log-6057_6058,
log-6059_6060.
# Then the server took a new snapshot with index = 6065.
# When the server tried to purge logs, its suggest purge index was set to 5066
(6066 - 1000, 1000 is the preserved logs set by
server.log.purge.preservation.log.num)
# The IllegalStateException occurred.
I think purgeIndex is not updated after installing a snapshot from leader.
https://github.com/apache/ratis/blob/8638a2ffa802de576aae546c22160da3d9339a8f/ratis-server/src/main/java/org/apache/ratis/server/raftlog/RaftLogBase.java#L336-L339
was:
java.lang.IllegalStateException: Unexpected gap in segments: binarySearch(5066)
returns -1, segments=[log-6057_6058, log-6059_6060]
at
org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogCache$LogSegmentList.purge(SegmentedRaftLogCache.java:373)
at
org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogCache.purge(SegmentedRaftLogCache.java:614)
at
org.apache.ratis.server.raftlog.segmented.SegmentedRaftLog.purgeImpl(SegmentedRaftLog.java:379)
at org.apache.ratis.server.raftlog.RaftLogBase.purge(RaftLogBase.java:332)
at
org.apache.ratis.server.impl.StateMachineUpdater.takeSnapshot(StateMachineUpdater.java:313)
at
org.apache.ratis.server.impl.StateMachineUpdater.checkAndTakeSnapshot(StateMachineUpdater.java:275)
at
org.apache.ratis.server.impl.StateMachineUpdater.run(StateMachineUpdater.java:192)
at java.base/java.lang.Thread.run(Thread.java:834)
> IllegalStateExcetpion: Unexpected gap in segments: binarySearch
> ---------------------------------------------------------------
>
> Key: RATIS-2056
> URL: https://issues.apache.org/jira/browse/RATIS-2056
> Project: Ratis
> Issue Type: Bug
> Components: server, snapshot
> Affects Versions: 3.0.1
> Reporter: Song Ziyang
> Priority: Major
>
> java.lang.IllegalStateException: Unexpected gap in segments:
> binarySearch(5066) returns -1, segments=[log-6057_6058, log-6059_6060]
> at
> org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogCache$LogSegmentList.purge(SegmentedRaftLogCache.java:373)
> at
> org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogCache.purge(SegmentedRaftLogCache.java:614)
> at
> org.apache.ratis.server.raftlog.segmented.SegmentedRaftLog.purgeImpl(SegmentedRaftLog.java:379)
> at org.apache.ratis.server.raftlog.RaftLogBase.purge(RaftLogBase.java:332)
> at
> org.apache.ratis.server.impl.StateMachineUpdater.takeSnapshot(StateMachineUpdater.java:313)
> at
> org.apache.ratis.server.impl.StateMachineUpdater.checkAndTakeSnapshot(StateMachineUpdater.java:275)
> at
> org.apache.ratis.server.impl.StateMachineUpdater.run(StateMachineUpdater.java:192)
> at java.base/java.lang.Thread.run(Thread.java:834)
>
> # This server was recently added to the group, with a snapshot (index=6056)
> installed from the leader.
> # It then applied some new logs and formed log segments log-6057_6058,
> log-6059_6060.
> # Then the server took a new snapshot with index = 6065.
> # When the server tried to purge logs, its suggest purge index was set to
> 5066 (6066 - 1000, 1000 is the preserved logs set by
> server.log.purge.preservation.log.num)
> # The IllegalStateException occurred.
>
> I think purgeIndex is not updated after installing a snapshot from leader.
> https://github.com/apache/ratis/blob/8638a2ffa802de576aae546c22160da3d9339a8f/ratis-server/src/main/java/org/apache/ratis/server/raftlog/RaftLogBase.java#L336-L339
>
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