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From "Eric Newton (JIRA)" <>
Subject [jira] [Resolved] (ACCUMULO-3684) balance going too slow
Date Tue, 23 Jun 2015 17:59:00 GMT


Eric Newton resolved ACCUMULO-3684.
    Resolution: Won't Fix

This ticket is factually incorrect. The number of operations queued before flushing is scaled
by the number of tablet servers.

> balance going too slow
> ----------------------
>                 Key: ACCUMULO-3684
>                 URL:
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: master
>         Environment: large test cluster cluster, hadoop 2, accumulo 1.6.2
>            Reporter: Eric Newton
>            Assignee: Eric Newton
>             Fix For: 1.8.0
> While testing a new balancer on a large cluster, performing a large number of migrations
appears to have been going slowly (20 minutes to migrate 10K tablets). Since this balancer
requires several rounds, the cluster was in transition for couple of hours.
> The master queues requests for tablet servers, and then pushes them out in a "flush".
Presently, it will not queue more than 5000 requests *for the entire cluster* so as to not
overwhelm the tservers. But if the cluster has hundreds of servers, they would not be overwhelmed
> Perhaps we should remove the pause after any intermediary flush.

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