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Date: Mon, 16 Apr 2007 22:20:15 -0700 (PDT)
From: "Alejandro Abdelnur (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Updated: (HADOOP-1111) Job completion notification to a job
 configured URL
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     [ https://issues.apache.org/jira/browse/HADOOP-1111?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alejandro Abdelnur updated HADOOP-1111:
---------------------------------------

    Attachment: patch-1111.txt

Made http server port to receive notification dynamically assigned (setting it zero).

> Job completion notification to a job configured URL
> ---------------------------------------------------
>
>                 Key: HADOOP-1111
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1111
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: mapred
>    Affects Versions: 0.12.2
>         Environment: all
>            Reporter: Alejandro Abdelnur
>             Fix For: 0.13.0
>
>         Attachments: patch-1111.txt, patch-1111.txt, patch-1111.txt, patch-1111.txt, patch-1111.txt, patch-1111.txt, patch-1111.txt, patch-1111.txt, patch-1111.txt, patch-1111.txt
>
>
> Currently clients have to poll the JobTracker to find if a job has completed or not.
> When invoking Hadoop from other systems is desirable to have a notification mechanism on job completion. 
> The notification approach simplifies the client waiting for completion and removes load from the JobTracker as polling can be avoided. 
> Proposed solution:
> When the JobTracker processes the completion of a job (success and failure)  if the job configuration has a jobEnd.notificationUrl property it will make a HTTP GET request to the specified URL.
> The jobEnd.notificationUrl property may include 2 variables in it '${jobId}' and '${jobStatus}'. if they are present, they will be replaced with tehe job ID and status of the job and the URL will be invoked.
> Two additional properties, 'jobEnd.retries' and 'jobEnd.retryInterval', will indicate retry behavior.
> Not to delay the JobTracker processing while doing notifications, a ConsumerProducer Queue will be used to queue up job notification upon completion.
> A daemon thread will consume job notifications from the above Queue and will make the URL invocation. 
> On notification failure, the job notification is  queue up again on the notification queue.
> The queue will be a java.util.concurrent.DelayQueue. This will make job notifications (on retries) to be avaiable on the consumer side only when the retry time is up.
> The changes will be done in the JobTracker and in the LocalJobRunner.

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