hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "David Bowen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1111) Job completion notification to a job configured URL
Date Tue, 13 Mar 2007 17:23:10 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12480489
] 

David Bowen commented on HADOOP-1111:
-------------------------------------


I don't see the rationale for using a DelayQueue here, since no delay is required.  A LinkedBlockingQueue
would seem more appropriate.

Is there some reason for using GET rather than POST?

Looks like the notification thread can only end with the error message that it is ending unexpectedly.
 Right?

I think the running flag should be declared volatile.

Stylistically, I think a singleton class is generally preferable to a class with only static
members.  But others may disagree.



> 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: 0.12.0
>         Environment: all
>            Reporter: Alejandro Abdelnur
>         Attachments: 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.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message