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Posted to issues@kudu.apache.org by "YifanZhang (Jira)" <ji...@apache.org> on 2019/10/01 13:08:00 UTC

[jira] [Commented] (KUDU-2914) Rebalance tool support moving replicas from some specific tablet servers

    [ https://issues.apache.org/jira/browse/KUDU-2914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16941809#comment-16941809 ] 

YifanZhang commented on KUDU-2914:
----------------------------------

Thanks for [~aserbin]'s suggestions, it's very useful.

I have tow questions. If we let the master replace all replicas at the tablet server, how to know when the whole replacement process ends, do we need to keep checking whether all relicas have been removed? And if it is possible to mark multiple tablet servers as 'decomissioned'? I mean mark two or more replicas of a tablet with the REPLACE attribute.

> Rebalance tool support moving replicas from some specific tablet servers
> ------------------------------------------------------------------------
>
>                 Key: KUDU-2914
>                 URL: https://issues.apache.org/jira/browse/KUDU-2914
>             Project: Kudu
>          Issue Type: Improvement
>          Components: CLI
>            Reporter: YifanZhang
>            Assignee: YifanZhang
>            Priority: Minor
>
> When we need to remove some tservers from a kudu cluster (maybe just for saving resources or replacing these servers with new servers), it's better to move all replicas on these tservers to other tservers in a cluster in advance, instead of waiting for all replicas kicked out and evicting new replicas. This can be achieved by rebalance tool supporting specifying 'blacklist_tservers'.



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