[jira] [Commented] (RATIS-850) Allow log purge up to snapshot index

["Mukul Kumar Singh (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/RATIS-850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17083774#comment-17083774 ] 

Mukul Kumar Singh commented on RATIS-850:
-----------------------------------------

[~hanishakoneru], This was done on Ozone's datanode to avoid cases where aggressive log purge will cause the log to be purged and this will trigger snapshot installation rather very frequently.

> Allow log purge up to snapshot index
> ------------------------------------
>
>                 Key: RATIS-850
>                 URL: https://issues.apache.org/jira/browse/RATIS-850
>             Project: Ratis
>          Issue Type: Improvement
>            Reporter: Hanisha Koneru
>            Assignee: Hanisha Koneru
>            Priority: Major
>         Attachments: RATIS-850.001.patch
>
>
> Ratis logs are purged only up to the least commit index on all the peers. But if one peer is down, it stop log purging on all the peers. If the Ratis server takes snapshots, then we can purge logs up to the snapshot index even if some peer has not committed up to that index. When the peer rejoins the ring, instead of ratis logs, it can get the snapshot to catch up.



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