[infinispan-issues] [JBoss JIRA] (ISPN-2353) Allow KOut/VOut emitting Mapper where VOut is null

[Mircea Markus (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-2353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723823#comment-12723823 ] 

Mircea Markus commented on ISPN-2353:
-------------------------------------

As per the email thread posted by Vladimir this seems to be caused when async clusters are used.
We already offer support for async clusters(ISPN-658), so we should handle this situation for map reduce as well.
Basically before launching the M/R task we should check if the cache is started locally. If it isn't we shouldn't start it. 
                
> Allow KOut/VOut emitting Mapper where VOut is null
> --------------------------------------------------
>
>                 Key: ISPN-2353
>                 URL: https://issues.jboss.org/browse/ISPN-2353
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Distributed Execution and Map/Reduce
>    Affects Versions: 5.2.0.Alpha4
>            Reporter: Vladimir Blagojevic
>            Assignee: Mircea Markus
>             Fix For: 5.2.0.Beta1, 5.2.0.Final
>
>
> In some cases Mapper being executed on remote nodes might produce intermediate KOut/VOut pairs where VOut is null. Should allow/account for that possibility? Currently such tasks fail with NPE. 

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