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From "Tsuyoshi OZAWA (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-2229) ContainerId can overflow with RM restart
Date Thu, 17 Jul 2014 00:52:05 GMT

     [ https://issues.apache.org/jira/browse/YARN-2229?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsuyoshi OZAWA updated YARN-2229:
---------------------------------

    Attachment: YARN-2229.9.patch

Thank you for the comments. Updated a patch to address comments as follows:
* Added comments to the new getContainerId method.
* Updated ContainerId#hashCode and Epoch#hashCode to use methods generated by IDE
* Updated CheckpointAMPreemptionPolicy#sort#compare to use ContainerId#compare.
* Changed not to mark {{getId}} as deprecated.

> ContainerId can overflow with RM restart
> ----------------------------------------
>
>                 Key: YARN-2229
>                 URL: https://issues.apache.org/jira/browse/YARN-2229
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Tsuyoshi OZAWA
>            Assignee: Tsuyoshi OZAWA
>         Attachments: YARN-2229.1.patch, YARN-2229.2.patch, YARN-2229.2.patch, YARN-2229.3.patch,
YARN-2229.4.patch, YARN-2229.5.patch, YARN-2229.6.patch, YARN-2229.7.patch, YARN-2229.8.patch,
YARN-2229.9.patch
>
>
> On YARN-2052, we changed containerId format: upper 10 bits are for epoch, lower 22 bits
are for sequence number of Ids. This is for preserving semantics of {{ContainerId#getId()}},
{{ContainerId#toString()}}, {{ContainerId#compareTo()}}, {{ContainerId#equals}}, and {{ConverterUtils#toContainerId}}.
One concern is epoch can overflow after RM restarts 1024 times.
> To avoid the problem, its better to make containerId long. We need to define the new
format of container Id with preserving backward compatibility on this JIRA.



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