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Date: Thu, 11 Apr 2013 21:53:16 +0000 (UTC)
From: "Zhijie Shen (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12640844.1365105617250.152557.1365717196863@arcas>
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Subject: [jira] [Updated] (YARN-542) Change the default global AM
 max-attempts value to be not one
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     [ https://issues.apache.org/jira/browse/YARN-542?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zhijie Shen updated YARN-542:
-----------------------------

    Attachment: YARN-542.1.patch

I've drafted a patch, which includes the following modifications:

1. Change the default value of yarn.resourcemanager.am.max-attempts from 1 to 2.

2. In the test cases, where more than one attempt is set, YarnConfiguration.DEFAULT_RM_AM_MAX_ATTEMPTS is used instead of the hard-coding values.

3. Assert the set maxAttempts > 1 where one and more than one will make difference.
                
> Change the default global AM max-attempts value to be not one
> -------------------------------------------------------------
>
>                 Key: YARN-542
>                 URL: https://issues.apache.org/jira/browse/YARN-542
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Zhijie Shen
>         Attachments: YARN-542.1.patch
>
>
> Today, the global AM max-attempts is set to 1 which is a bad choice. AM max-attempts accounts for both AM level failures as well as container crashes due to localization issue, lost nodes etc. To account for AM crashes due to problems that are not caused by user code, mainly lost nodes, we want to give AMs some retires.
> I propose we change it to atleast two. Can change it to 4 to match other retry-configs.

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