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https://issues.apache.org/jira/browse/RATIS-201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16352648#comment-16352648
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Lokesh Jain commented on RATIS-201:
-----------------------------------
I saw the IllegalStateException when I was working on TestRaftAsyncWithGrpc.
The error was thrown by RaftBasicTests#testWithLoad:349. The possible reason is
that there is a background task running which restarted the leader and
meanwhile getLeader could be called by testWithLoad which could lead to the
error. I haven't seen the error now though.
I have added a patch with the corresponding change.
> MiniRaftCluster#getLeader may incorrectly throw IllegalStateException
> ---------------------------------------------------------------------
>
> Key: RATIS-201
> URL: https://issues.apache.org/jira/browse/RATIS-201
> Project: Ratis
> Issue Type: Bug
> Reporter: Lokesh Jain
> Assignee: Lokesh Jain
> Priority: Major
> Attachments: RATIS-201.001.patch, RATIS-201.002.patch
>
>
> It can be possible for more than one server to have their role set as LEADER
> in a ratis ring. There can be a race condition where term of a follower is
> updated but its role is not yet updated to FOLLOWER. In such a scenario
> MiniRaftCluster#getLeader would throw IllegalStateException.
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