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https://issues.apache.org/jira/browse/RATIS-1751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz-wo Sze resolved RATIS-1751.
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Fix Version/s: 3.0.0
Resolution: Fixed
The pull request is now merged.
> Race condition between LeaderStateImpl & ServerState
> ----------------------------------------------------
>
> Key: RATIS-1751
> URL: https://issues.apache.org/jira/browse/RATIS-1751
> Project: Ratis
> Issue Type: Bug
> Components: server
> Affects Versions: 2.4.0
> Reporter: Song Ziyang
> Assignee: Tsz-wo Sze
> Priority: Minor
> Fix For: 3.0.0
>
> Attachments: error_stack.log
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> An IndexOutOfBoundsException is thrown from LeaderStateImpl during runtime.
> The error stack is attached.
> After checking the code, I think there are data race conditions between
> LeaderStateImpl.voterLists and ServerState.ConfigurationManager.currentConf.
> CurrentConf and voterLists should be updated synchronously, since there're
> strongly-related. However, in 2.4.0, currentConf in ServerState is updated in
> server-thread-pool, while voterLists in LeaderStateImpl is updated in
> LeaderState EventProcessor thread. There is possibility that
> IndexOutOfBoundsException occurs due to this data race.
>
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