[infinispan-issues] [JBoss JIRA] (ISPN-2923) provides an optimal way to search and retrieve the first non null value
Mathieu Lachance (JIRA)
jira-events at lists.jboss.org
Wed Mar 27 17:27:42 EDT 2013
[ https://issues.jboss.org/browse/ISPN-2923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763642#comment-12763642 ]
Mathieu Lachance commented on ISPN-2923:
----------------------------------------
I did not ended up with null values in the cache. Sorry for the confusion.
When I was saying searching, I was referring more to this scenario :
for each (Map.Entry<K, V> entry : cache.values()){
if (entry.getValue().getACertainField().equals(aCertainValue)){
return entry;
}
}
but in a distributed fashion.
By providing a stop in the map reduce operation we could achieve this.
> 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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