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From "Enrico Levesque (JIRA)" <j...@apache.org>
Subject [jira] Commented: (ODE-483) Instance replayer
Date Tue, 01 Sep 2009 15:52:32 GMT

    [ https://issues.apache.org/jira/browse/ODE-483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12749956#action_12749956

Enrico Levesque commented on ODE-483:

ODE Replayer with process collaboration support : Project description

The project is to build a tool for migration into Apache ODE to enable it to replay long running
collaborative process instances along with human assistance.  The purpose of this tool is
to ease the work of the analysts during the process of migrating multiple collaborative long
running instances from one version of a process to another modified.  

The tool will replay the exchange messages that occured during the past execution.  It will
take automatically new routes during process execution and will determine what kind of invokes
to do, blank execution or synchronization with other processes.  

The tool will ask for analyst intervention to determine the right values to insert when the
instance is waiting for an asynchronous human exchange to be re-introduced into the process.
 For this purpose, a web interface will be created informing the analyst of all exchange messages
waiting to be replayed.  The analyst will be informed when the instances is waiting for a
human exchange or any kind of non-process exchanges to be re-introduced.  This interface will
then permit the analyst to supervise, manage and pilot the migration process.

This Replayer will be able to determine which previous invokes need to be compensated due
to data changes or flow changes.  The compensations will be done by analysts directly into
the databases, or will be ignored depending on each case.

For this kind of migration to work, an important assomption need to always be true: that we
can at any time compensate a previous activity.  If a critical compensation cannot be done,
the migration will have to be aborted, therefore the necessity to be able to restore to original
state at any time during migration. 

> Instance replayer
> -----------------
>                 Key: ODE-483
>                 URL: https://issues.apache.org/jira/browse/ODE-483
>             Project: ODE
>          Issue Type: New Feature
>    Affects Versions: Wishlist
>            Reporter: Rafal Rusin
>             Fix For: Wishlist
>         Attachments: bookshop-example-1.zip, bookshop-example-4.zip, Khriss-AdaptabilitySupport.pdf,
replayer-example.zip, replayer-proposal.diff
> Imagine situation when client has deployed a process with a lot of active, long running
instances. Then he finds there's a bug in this process and a simple bugfix is needed. But
with current versioning rules, new version is only used when new instances are created. So
there's no simple way for doing such bufixes (which are usually possible with eg. java application
using database connection). It is a blocking argument for deploying ODE Bpel solution instead
of a regular java application.
> I think the best way to deal with such situations is to add serialize/deserialize to/from
xml operations for process instances in management API. Also pause/resume ODE operations would
be useful. 
> Then, a bugfix procedure would look like this;
> -pause ode
> -serialize instances
> -deploy newer version
> -deserialize instances and fix manually any import errors 
> -resume ODE
> It would also be a benefit of being able to do migration from older to newer ODE and
between Hibernate/JPA DAOs, which I saw already in some bug reports. 
> What do you think about it?
> Regards

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