[infinispan-issues] [JBoss JIRA] (ISPN-2923) provides an optimal way to search and retrieve the first non null value

[Mircea Markus (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-2923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763580#comment-12763580 ] 

Mircea Markus commented on ISPN-2923:
-------------------------------------

Infinispan doesn't allow inserting keys with null values, how did you end up with null values in the cache? 
I think this makes sense as a general requirement, e.g. stop a map/reduce task if enough values have been found. 
                
> provides an optimal way to search and retrieve the first non null value
> -----------------------------------------------------------------------
>
>                 Key: ISPN-2923
>                 URL: https://issues.jboss.org/browse/ISPN-2923
>             Project: Infinispan
>          Issue Type: Feature Request
>          Components: Distributed Execution and Map/Reduce
>    Affects Versions: 5.2.5.Final
>            Reporter: Mathieu Lachance
>            Assignee: Vladimir Blagojevic
>
> It would be nice if infinispan could provide a way to the common problem of searching and retrieve the first non null value.
> My attempt was to use the map reduce framework, but it would still scan all the keys and value even if the result as been found. Maybe Infinispan could provide a way to "stop" the map-reduce operation on all nodes when asked, ex, when the first non null value has been found ?

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