5 Replies Latest reply on Feb 21, 2018 5:20 AM by jaga244

The Grouping API

cotton.ben May 15, 2013 1:09 PM

At https://docs.jboss.org/author/display/ISPN/The+Grouping+API it is documented:

> In some cases you may wish to co-locate a group of entries onto a particular node. In this, the group API will be useful for you.

How? EXACTLY HOW?

At the URL above, an example implementation of Grouper<T>#computeGroup(key, origGroup) is provided. In the example provided, a key is mapped to Group "1" or Group "2".

QUESTION: How do I use this Key-->Group mapping to then pin the key to a particular physical Node executing on the Infinispan grid? I need to go from computeGroup() /* pinning a key to a Group */ to computeNode() /* pinning a key to a Node */. How?

1. Re: The Grouping API

defunkt May 15, 2013 4:39 PM (in response to cotton.ben)

I think what that document means is that you want a group of entries to be located onto the same node, without actually knowing which one they are being sent to. In any way, I think you can use AdvancedCache.getDistributionManager().locate(key).
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2. Re: The Grouping API

cotton.ben May 15, 2013 5:19 PM (in response to defunkt)

Thank you for this response, Gilad.

Your comment makes sense in the context of what I am experiencing ... I thought I could use Grouper#computeGroup(key, origGroup) to pin a Cache.Entry<K,V> onto a particular node that I would identify (but that may not be the case!). Let me test. Appreciate your pointing out AdvancedCache.getDistributionManager().locate(key) will put that to work right now.

thanks again.
Ben
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3. Re: The Grouping API

nadirx May 16, 2013 3:58 AM (in response to cotton.ben)

Ben, in order to "pin" keys exactly to a specific node, use the Key Affinity Service https://docs.jboss.org/author/display/ISPN/Key+affinity+service
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4. Re: The Grouping API

cotton.ben May 16, 2013 6:55 AM (in response to nadirx)

thanks Tristan.
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5. Re: The Grouping API

jaga244 Feb 21, 2018 5:20 AM (in response to nadirx)

hi sir,
I wanted pin key to pariticular node.So, i can use key Affinity Service .But ,if any node down or starting new node,that make affinity lost.how could i solve this??
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