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Posted to issues@ratis.apache.org by "Hanisha Koneru (JIRA)" <ji...@apache.org> on 2019/03/14 02:07:00 UTC

[jira] [Commented] (RATIS-498) Notify Follower to Install Snapshot through state machine

    [ https://issues.apache.org/jira/browse/RATIS-498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16792253#comment-16792253 ] 

Hanisha Koneru commented on RATIS-498:
--------------------------------------

Attached an initial patch. This patch (v0) does not include unit tests. 

> Notify Follower to Install Snapshot through state machine
> ---------------------------------------------------------
>
>                 Key: RATIS-498
>                 URL: https://issues.apache.org/jira/browse/RATIS-498
>             Project: Ratis
>          Issue Type: New Feature
>          Components: server
>            Reporter: Hanisha Koneru
>            Assignee: Hanisha Koneru
>            Priority: Major
>         Attachments: RATIS-498.000.patch
>
>
> When a lagging Follower wants to catch up with the Leader, and the Leader only has logs with start index greater than the Followers's last log index, then the leader sends an InstallSnapshotRequest to the the Follower. 
> The aim of this Jira is to allow State Machine to decouple snapshot installation from the Ratis server. When Leader does not have the logs to get the Follower up to speed, it should notify the Follower to install a snapshot (if install snapshot through Log Appender is disabled). The Follower in turn notifies its state machine that a snapshot is required to catch up with the leader.



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