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From "Shawn Walker (JIRA)" <>
Subject [jira] [Created] (ACCUMULO-4353) Stabilize tablet assignment
Date Thu, 23 Jun 2016 19:19:16 GMT
Shawn Walker created ACCUMULO-4353:

             Summary: Stabilize tablet assignment
                 Key: ACCUMULO-4353
             Project: Accumulo
          Issue Type: Improvement
            Reporter: Shawn Walker
            Assignee: Shawn Walker
            Priority: Minor

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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