[jira] [Updated] (ACCUMULO-4353) Stabilize tablet assignment during transient failure

["Christopher Tubbs (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ACCUMULO-4353?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Christopher Tubbs updated ACCUMULO-4353:
----------------------------------------
    Fix Version/s: 1.8.0

> Stabilize tablet assignment during transient failure
> ----------------------------------------------------
>
>                 Key: ACCUMULO-4353
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4353
>             Project: Accumulo
>          Issue Type: Improvement
>            Reporter: Shawn Walker
>            Assignee: Shawn Walker
>            Priority: Minor
>             Fix For: 1.8.0
>
>          Time Spent: 2h 40m
>  Remaining Estimate: 0h
>
> When a tablet server dies, Accumulo attempts to reassign the tablets it was hosting as quickly as possible to maintain availability.  If multiple tablet servers die in quick succession, such as from a rolling restart of the Accumulo cluster or a network partition, this behavior can cause a storm of reassignment and rebalancing, placing significant load on the master.
> To avert such load, Accumulo should be capable of maintaining a steady tablet assignment state in the face of transient tablet server loss.  Instead of reassigning tablets as quickly as possible, Accumulo should be await the return of a temporarily downed tablet server (for some configurable duration) before assigning its tablets to other tablet servers.



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