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From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-4353) Stabilize tablet assignment during transient failure
Date Fri, 01 Jul 2016 16:14:11 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15359198#comment-15359198
] 

Keith Turner commented on ACCUMULO-4353:
----------------------------------------

This is good advice.  I wouldn't limit it to thinking about the case where possibly something
may have been agreed upon.  Its just good in general to try to leverage the community to create
better solutions.  However sometimes it can be tricky sometimes to know when to engage and
how often to engage.  Given how busy everyone is, ideally one would want to minimize the amount
of the community's time used while maximizing the benefit from the community to reach a solution.
 Of course its impossible to optimize this.

> 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
>          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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