Dmitriy Setrakyan created IGNITE-640:
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             Summary: Implement IgniteMultimap data structures
                 Key: IGNITE-640
                 URL: https://issues.apache.org/jira/browse/IGNITE-640
             Project: Ignite
          Issue Type: New Feature
          Components: data structures
            Reporter: Dmitriy Setrakyan


We need to add {{IgniteMultimap}} data structure in addition to other data 
structures provided by Ignite. {{IgniteMultiMap}} should have similar API to 
{{java.util.Map}} class in JDK, but support the semantics of multiple values 
per key, similar to [Guava 
Multimap|http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/collect/Multimap.html]

Multimap should also support colocated and non-colocated modes, similar to 
[IgniteQueue|https://github.com/apache/incubator-ignite/blob/master/modules/core/src/main/java/org/apache/ignite/IgniteQueue.java]
 and its implementation, 
[GridAtomicCacheQueueImpl|https://github.com/apache/incubator-ignite/blob/master/modules/core/src/main/java/org/apache/ignite/internal/processors/datastructures/GridAtomicCacheQueueImpl.java].




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