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From "Sean Busbey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1454) Need good way to perform a rolling restart of all tablet servers
Date Sat, 14 Feb 2015 20:22:14 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14321688#comment-14321688
] 

Sean Busbey commented on ACCUMULO-1454:
---------------------------------------

That sounds like a problem for the parent issue, but not for this one. If we're doing a rolling
restart generally (that is not during an upgrade) then we needn't worry about version conflicts.

Maybe worth another child on the parent issue for an RPC to master about maximum running version
negotiation?

> 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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