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From "Ivan Mitic (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-5066) JobTracker should set a timeout when calling into job.end.notification.url
Date Sun, 17 Mar 2013 21:59:14 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5066?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ivan Mitic updated MAPREDUCE-5066:
----------------------------------

    Status: Patch Available  (was: Open)
    
> JobTracker should set a timeout when calling into job.end.notification.url
> --------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5066
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5066
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.0.3-alpha, 1-win, 1.3.0
>            Reporter: Ivan Mitic
>            Assignee: Ivan Mitic
>         Attachments: MAPREDUCE-5066.branch-1-win.patch
>
>
> In current code, timeout is not specified when JobTracker (JobEndNotifier) calls into
the notification URL. When the given URL points to a server that will not respond for a long
time, job notifications are completely stuck (given that we have only a single thread processing
all notifications). We've seen this cause noticeable delays in job execution in components
that rely on job end notifications (like Oozie workflows). 
> I propose we introduce a configurable timeout option and set a default to a reasonably
small value.
> If we want, we can also introduce a configurable number of workers processing the notification
queue (not sure if this is needed though at this point).
> I will prepare a patch soon. Please comment back.

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