Confining objects to a particular node in a distributed cluster

I have a partitioned cache for a cluster and there are n nodes(jvm instance) within that particular cluster. Both the data and backup data are randomly and evenly spread accross different nodes. Is there any way to put a constraint based on the cached object value (eg object with value >5) or the newly cached object should always reside in a particular node? Is partitioned near cache supports that facility? I want that object to be loaded in a particular user preffered node for the first time itself irrespective of where it is referred?

Hi,
there is support to a somewhat similar functionality, but it is impossible to exactly achieve what you want.
First of all, Coherence places and locates objects in the partitioned caches (distributed cache and near cache are partitioned caches) strictly based on the key. So it is impossible to achieve data placement based on any part of the value. Placement can depend only based on the key.
Second: when nodes come and go, data in a partitioned cache moves around with the granularity of these movements being the partition. There is a way to influence which partition a specific key ends up or rather to influence that certain keys end up in the same partition, but the placement of partitions on nodes is not static, it varies over time. However you can determine which node a certain partition resides at the time of asking. Of course it might change right afterwards :-).
So what you can do is you can ensure that groups of your keys end up on the same partition and hence they always reside on the same node.
To achieve this either your keys must implement KeyAssociation or you must define a KeyAssociator instance for your cache. When this is done, then you can optimize your queries and aggregations by using the KeyAssociatedFilter or PartitionFilter to execute only on certain nodes or partitions.
For more about this, look at the following Wiki page:
http://wiki.tangosol.com/display/COH34UG/Data+Affinity
Best regards,
Robert

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To err is human, but to really foul it up requires a computer.
The optimist believes we are in the best of all possible worlds - the pessimist fears this is true.
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Two-stage match demo.vi ‏8 KB

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