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https://issues.apache.org/jira/browse/RATIS-1749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17636227#comment-17636227
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Tsz-wo Sze commented on RATIS-1749:
-----------------------------------
bq. ... Otherwise the new server may receive SHUTDOWN reply. What is the
correct practice to add a new node to an existed group?
I see. Please try adding an empty group and then setConf. That is what
runMultiGroupTest does it. See
https://github.com/apache/ratis/blob/f2447cfe0b94ad5f9e72dff1623fa90b6f42f4f5/ratis-server/src/test/java/org/apache/ratis/server/impl/GroupManagementBaseTest.java#L319
{code}
final RaftGroup newGroup = RaftGroup.valueOf(groupId);
{code}
> GroupMismatchException thrown when setConfiguration
> ---------------------------------------------------
>
> Key: RATIS-1749
> URL: https://issues.apache.org/jira/browse/RATIS-1749
> Project: Ratis
> Issue Type: Bug
> Components: client, raft-group
> Affects Versions: 2.4.0
> Reporter: Song Ziyang
> Priority: Major
> Attachments: error_stack.log
>
>
> GroupMismatchException occurs when I'm trying to start and add a new server
> to the group.
> Reproduce steps:
> # call CompletableFuture.supplyAsync(admin().setConfiguration(newGroup))
> # call groupManagementApi(newServer).add(group)
> GroupMismatchException happens time to time, as in the attched log.
> I think the setConfiguration here may route the request to the NEW server to
> be added, since it does not explicitly assign a serverId in request.
> setConfiguration arrives before addNewGroup, so GroupMismatchException
> happens.
> [1][https://github.com/apache/ratis/blob/f2447cfe0b94ad5f9e72dff1623fa90b6f42f4f5/ratis-client/src/main/java/org/apache/ratis/client/api/AdminApi.java#L39]
>
>
>
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