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https://issues.apache.org/jira/browse/RATIS-252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16538197#comment-16538197
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Tsz Wo Nicholas Sze commented on RATIS-252:
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r252_20180710.patch: some code cleanup.
> Add an API for state machine to determining server role
> -------------------------------------------------------
>
> Key: RATIS-252
> URL: https://issues.apache.org/jira/browse/RATIS-252
> Project: Ratis
> Issue Type: New Feature
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Priority: Major
> Attachments: r252_20180710.patch
>
>
> In some applications, the state machine may update external database/systems
> while applying a transaction. When there are multiple servers in a raft
> group, all servers will submit the same update to the external systems. It
> unnecessarily overloads the external system. Ideally, only the leader should
> send the update and the followers should not.
> In this JIRA, we provide an API so that the state machine can query its
> server role in order to determine if it should send the update.
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