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From "Olga Natkovich (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1478) Add progress notification listener to PigRunner API
Date Thu, 08 Jul 2010 04:29:50 GMT

    [ https://issues.apache.org/jira/browse/PIG-1478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12886227#action_12886227
] 

Olga Natkovich commented on PIG-1478:
-------------------------------------

Richard, I think it would be good to provide more information regarding each API of the listener.
For instance, does jobFinishedNotification would be called for all jobs or only for successful
jobs?

Also, I think Dmitry asked for this feature during the dev meeting. Dmitry, I think it would
be good if you could review the API to make sure that it fits your needs.

> Add progress notification listener to PigRunner API
> ---------------------------------------------------
>
>                 Key: PIG-1478
>                 URL: https://issues.apache.org/jira/browse/PIG-1478
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Richard Ding
>            Assignee: Richard Ding
>             Fix For: 0.8.0
>
>         Attachments: PIG-1478.patch
>
>
> PIG-1333 added PigRunner API to allow Pig users and tools to get a status/stats object
back after executing a Pig script. The new API, however, is synchronous (blocking). It's known
that a Pig script can spawn tens (even hundreds) MR jobs and take hours to complete. Therefore
it'll be nice to give progress feedback to the callers during the execution.
> The proposal is to add an optional parameter to the API:
> {code}
> public abstract class PigRunner {
>     public static PigStats run(String[] args, PigProgressNotificationListener listener)
{...}
> }
> {code} 
> The new listener is defined as following:
> {code}
> package org.apache.pig.tools.pigstats;
> public interface PigProgressNotificationListener extends java.util.EventListener {
>     // just before the launch of MR jobs for the script
>     public void LaunchStartedNotification(int numJobsToLaunch);
>     // number of jobs submitted in a batch
>     public void jobsSubmittedNotification(int numJobsSubmitted);
>     // a job is started
>     public void jobStartedNotification(String assignedJobId);
>     // a job is completed successfully
>     public void jobFinishedNotification(JobStats jobStats);
>     // a job is failed
>     public void jobFailedNotification(JobStats jobStats);
>     // a user output is completed successfully
>     public void outputCompletedNotification(OutputStats outputStats);
>     // updates the progress as percentage
>     public void progressUpdatedNotification(int progress);
>     // the script execution is done
>     public void launchCompletedNotification(int numJobsSucceeded);
> }
> {code}
> Any thoughts?

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