[jira] [Commented] (KUDU-2661) Add a tool to reconstruct master data from the tablet servers

["Will Berkeley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KUDU-2661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16738806#comment-16738806 ] 

Will Berkeley commented on KUDU-2661:
-------------------------------------

WIP tool available here: https://gerrit.cloudera.org/#/c/9490/

If you are thinking about using this uncommitted, experimental tool, make sure there is no other route to recovery first, and know that there is no guarantee that the tool will work.

> Add a tool to reconstruct master data from the tablet servers
> -------------------------------------------------------------
>
>                 Key: KUDU-2661
>                 URL: https://issues.apache.org/jira/browse/KUDU-2661
>             Project: Kudu
>          Issue Type: Improvement
>    Affects Versions: 1.8.0
>            Reporter: Will Berkeley
>            Assignee: Will Berkeley
>            Priority: Major
>
> On rare occasions, a cluster might lose all its masters permanently, especially if there is only a single master. This would mean a total loss of the whole cluster unless the user is willing to use tools to dump the data from each tablet server, save it, and reprocess it back into a useful form again. However, in many cases, it's actually possible to reconstruct a workable master state from information on the tablet servers. A tool to do this could be a lifesaver.



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