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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5801) JobTracker should refresh the hosts list upon recovery
Date Wed, 10 Jun 2009 06:19:07 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5801?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amar Kamat updated HADOOP-5801:
-------------------------------

    Release Note: The mapred-hosts list can change across restarts. Once the jobtracker recovers,
it detects all the tasktracker there are there in the history. If the hosts list is changed,
then the jobtracker will still have the tasktracker (data) internally but will disallow the
tracker when it contacts. As a result, the jobtracker will have to wait for the tracker to
timeout in order to re-execute the tasks. This patch simply refreshes the node list upon recovery
so that the invalid trackers are lost immediately. 

> JobTracker should refresh the hosts list upon recovery
> ------------------------------------------------------
>
>                 Key: HADOOP-5801
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5801
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Amar Kamat
>            Assignee: Amar Kamat
>             Fix For: 0.21.0
>
>         Attachments: 5801-0.20.patch, HADOOP-5801-v1.2.patch
>
>
> If the hosts file is changes across restart then it should be refreshed upon recovery
so that the excluded hosts are lost and the maps are re-executed.

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