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https://issues.apache.org/jira/browse/ACCUMULO-1454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13664592#comment-13664592
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Christopher Tubbs commented on ACCUMULO-1454:
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This shouldn't be too difficult. Essentially, one needs to pause load balancing
before each server goes down, and resume when the server comes back.
This could be done with a load balancer that detects that one is in a
"rolling-upgrade" state, and is less aggressive about tablet assignment...
maybe through a simple timeout delay before assignment.
> 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: Improvement
> Components: tserver
> Affects Versions: 1.5.0, 1.4.3
> Reporter: Mike Drob
>
> 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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