[jira] [Commented] (PIG-2344) UDF / LoadFunc / StoreFunc should be serializable

["Thomas Weise (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-2344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13226299#comment-13226299 ] 

Thomas Weise commented on PIG-2344:
-----------------------------------

Serialization alone would not help in situations where UDF exec(..) depends on state that needs to be initialized where exec(..) runs. One of the workarounds is to do that lazily from exec(...) currently, that will guarantee it happens where the action is...

Speaking about solutions with Ashutosh, we identified the following needs:

Pig should construct UDF through default/no-arg ctor. No more multiple times instantiation through UDF ctor with arguments.

Pig should call initialize(...) in the frontend, with the arguments provided for the UDF.

Pig should call preExec() in the backend once, this would be the place where things like local file system access etc. can take place

Probably there should also be a postExec() hook for any cleanup to be done.

And finally, need to address backward compatibility also, so that existing UDFs don't suddenly stop to work.

                
> UDF / LoadFunc / StoreFunc should be serializable
> -------------------------------------------------
>
>                 Key: PIG-2344
>                 URL: https://issues.apache.org/jira/browse/PIG-2344
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Ashutosh Chauhan
>
> If there is a redesign, this should be a requirement. We will get away with all the saving of state which got created in frontend and then recreating the same state in backend.  

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