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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1454) Need good way to perform a rolling restart of all tablet servers
Date Mon, 16 Feb 2015 20:16:12 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14323231#comment-14323231
] 

Josh Elser commented on ACCUMULO-1454:
--------------------------------------

Yes, you are correct. Thanks for commenting. We'll need to do some brainstorming as to what
we'll need to add to the RPC api to support it -- the above concern will likely be pulled
there. I just wanted to make sure I write it down so it doesn't get lost.

> Need good way to perform a rolling restart of all tablet servers
> ----------------------------------------------------------------
>
>                 Key: ACCUMULO-1454
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1454
>             Project: Accumulo
>          Issue Type: Sub-task
>          Components: tserver
>    Affects Versions: 1.4.3, 1.5.0
>            Reporter: Mike Drob
>         Attachments: ACCUMULO-1454-proposal-01.adoc, ACCUMULO-1454-proposal-01.html
>
>
> When needing to change a tserver parameter (e.g. java heap space) across the entire cluster,
there is not a graceful way to perform a rolling restart.
> The naive approach of just killing tservers one at a time causes a lot of churn on the
cluster as tablets move around and zookeeper tries to maintain current state.
> Potential solutions might be via a fancy fate operation, with coordination by the master.
Ideally, the master would know which servers are 'safe' to restart and could minimize overall
impact during the operation.



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