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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-12421) Add jitter to RetryInvocationHandler
Date Mon, 21 Sep 2015 23:33:05 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-12421?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Elliott Clark updated HADOOP-12421:
-----------------------------------
    Attachment: HADOOP-12421-v1.patch

Patch that add 15% jitter (+/- 7.5%) along with a unit test for it. 

> Add jitter to RetryInvocationHandler
> ------------------------------------
>
>                 Key: HADOOP-12421
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12421
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.8.0
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>         Attachments: HADOOP-12421-v1.patch
>
>
> Calls to NN can become synchronized across a cluster during NN failover. This leads to
a spike in requests until things recover. Making an already tricky time worse.



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