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Date: Wed, 20 May 2009 17:45:46 -0700 (PDT)
From: "Jeff Hammerbacher (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-5303) Hadoop Workflow System (HWS)
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    [ https://issues.apache.org/jira/browse/HADOOP-5303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12711438#action_12711438 ] 

Jeff Hammerbacher commented on HADOOP-5303:
-------------------------------------------

Hey Alejandro,

Any updates on when the code for HWS will be available to the open source community?

Thanks,
Jeff

> Hadoop Workflow System (HWS)
> ----------------------------
>
>                 Key: HADOOP-5303
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5303
>             Project: Hadoop Core
>          Issue Type: New Feature
>            Reporter: Alejandro Abdelnur
>            Assignee: Alejandro Abdelnur
>         Attachments: hws-preso-v1_0_2009FEB22.pdf, hws-spec2009MAR09.pdf, hws-v1_0_2009FEB22.pdf
>
>
> This is a proposal for a system specialized in running Hadoop/Pig jobs in a control dependency DAG (Direct Acyclic Graph), a Hadoop workflow application.
> Attached there is a complete specification and a high level overview presentation.
> ----
> *Highlights* 
> A Workflow application is DAG that coordinates the following types of actions: Hadoop, Pig, Ssh, Http, Email and sub-workflows. 
> Flow control operations within the workflow applications can be done using decision, fork and join nodes. Cycles in workflows are not supported.
> Actions and decisions can be parameterized with job properties, actions output (i.e. Hadoop counters, Ssh key/value pairs output) and file information (file exists, file size, etc). Formal parameters are expressed in the workflow definition as {{${VAR}}} variables.
> A Workflow application is a ZIP file that contains the workflow definition (an XML file), all the necessary files to run all the actions: JAR files for Map/Reduce jobs, shells for streaming Map/Reduce jobs, native libraries, Pig scripts, and other resource files.
> Before running a workflow job, the corresponding workflow application must be deployed in HWS.
> Deploying workflow application and running workflow jobs can be done via command line tools, a WS API and a Java API.
> Monitoring the system and workflow jobs can be done via a web console, command line tools, a WS API and a Java API.
> When submitting a workflow job, a set of properties resolving all the formal parameters in the workflow definitions must be provided. This set of properties is a Hadoop configuration.
> Possible states for a workflow jobs are: {{CREATED}}, {{RUNNING}}, {{SUSPENDED}}, {{SUCCEEDED}}, {{KILLED}} and {{FAILED}}.
> In the case of a action failure in a workflow job, depending on the type of failure, HWS will attempt automatic retries, it will request a manual retry or it will fail the workflow job.
> HWS can make HTTP callback notifications on action start/end/failure events and workflow end/failure events.
> In the case of workflow job failure, the workflow job can be resubmitted skipping previously completed actions. Before doing a resubmission the workflow application could be updated with a patch to fix a problem in the workflow application code.
> ----

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