2 Replies Latest reply on Oct 13, 2011 11:26 PM by gaprashanth

Question on using eagerLockSingleNode with keyAffinityService

gaprashanth Oct 12, 2011 6:13 AM

If it is recommended to use eagerLockSingleNode with KeyAffinityService to lock only locally only if you are updating the owner. THis greatly helps in avoiding locking remotely and any deadlocks.

But is it possible to use the user-defined keys with KeyAffinityService as the sample code shows Infinispan generated keys.

1. Re: Question on using eagerLockSingleNode with keyAffinityService

galder.zamarreno Oct 13, 2011 2:46 AM (in response to gaprashanth)

Not sure about this, but I'd imagine that for user-defined keys, you'd use the grouping API to collocate the data: https://docs.jboss.org/author/display/ISPN/The+Grouping+API
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2. Re: Question on using eagerLockSingleNode with keyAffinityService

gaprashanth Oct 13, 2011 11:26 PM (in response to galder.zamarreno)

Grouping API is really an adavntage to collocate the keys on specific nodes. But need some help to understand the article in detail.

Our understanding is that, the hash code of the key is not imporrant and only the hash code of the group is know to all the nodes. So whenever a request for a key lands in the cache, the group is determined at run-time using some algorithms and the key is added to a node where the group belongs.

But what is not clear is how do we know to which node a group belongs ? Is there a way to configure the groups to specific nodes. This could be beneficial in knowing the group and its node in advance so that we can redirect the requests to only those knows which are owners of the key.
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