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From "Botong Huang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-7720) [Federation] Race condition between second app attempt and UAM timeout when first attempt node is down
Date Tue, 09 Jan 2018 01:37:00 GMT

     [ https://issues.apache.org/jira/browse/YARN-7720?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Botong Huang updated YARN-7720:
-------------------------------
    Summary: [Federation] Race condition between second app attempt and UAM timeout when first
attempt node is down  (was: [Federation] Race condition between second app attempt and UAM
heartbeat when first attempt node is down)

> [Federation] Race condition between second app attempt and UAM timeout when first attempt
node is down
> ------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-7720
>                 URL: https://issues.apache.org/jira/browse/YARN-7720
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Botong Huang
>            Assignee: Botong Huang
>
> In Federation, multiple attempts of an application share the same UAM in each secondary
sub-cluster. When first attempt fails, we reply on the fact that secondary RM won't kill the
existing UAM before the AM heartbeat timeout (default at 10 min). When second attempt comes
up in the home sub-cluster, it will pick up the UAM token from Yarn Registry and resume the
UAM heartbeat to secondary RMs. 
> The default heartbeat timeout for NM and AM are both 10 mins. The problem is that when
the first attempt node goes down or out of connection, only after 10 mins will the home RM
mark the first attempt as failed, and then schedule the 2nd attempt in some other node. By
then the UAMs in secondaries are already timing out, and they might not survive until the
second attempt comes up. 



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