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Posted to notifications@accumulo.apache.org by "Josh Elser (JIRA)" <ji...@apache.org> on 2015/03/19 04:22:38 UTC
[jira] [Commented] (ACCUMULO-3683) Scanner retry time does not back
off or include jitter
[ https://issues.apache.org/jira/browse/ACCUMULO-3683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14368437#comment-14368437 ]
Josh Elser commented on ACCUMULO-3683:
--------------------------------------
This would obviously have impact outside of just scanner, but it would be good to also look at classes like MasterClient and ServerClient and include the same jitter/backoff logic there (I know MasterClient intentionally spins against the master *very* fast, but I still think it might be excessive in common failure cases).
> Scanner retry time does not back off or include jitter
> ------------------------------------------------------
>
> Key: ACCUMULO-3683
> URL: https://issues.apache.org/jira/browse/ACCUMULO-3683
> Project: Accumulo
> Issue Type: Improvement
> Components: client
> Reporter: Eric Newton
> Assignee: Eric Newton
> Fix For: 1.7.0
>
>
> When a tablet server goes down, scans will begin failing. The {{ThriftScanner}} has a hardcoded 100ms pause between retries.
> There are two things that would improve this: an exponential back-off, and some jitter, so the tservers aren't hammering the metadata table with requests for the new location at the same time the master is trying to re-assign the tablets.
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