[infinispan-dev] DIST, state transfer and cache loaders

[Bela Ban]

On 6/14/12 7:43 PM, Mircea Markus wrote:
>
> ----- Original Message -----
>> From: "Bela Ban"<bban at redhat.com>
>> To: infinispan-dev at lists.jboss.org
>> Sent: Thursday, June 14, 2012 7:20:31 AM
>> Subject: [infinispan-dev] DIST, state transfer and cache loaders
>>
>> It occurred to me that I'm not sure how state transfer happens in
>> conjunction with cache loaders, can someone confirm that the
>> statements
>> below are correct / incorrect ?
>> Cheers !
>>
>> - Say we have {A,B,C,D}, all nodes are configured with a disk-based
>> (local) cache loader
>>
>> - Key K is mapped to A and B
>>
>> - After some idle time, K is evicted from A and B
>>
>> - Now B leaves
>>
>> - A state transfer of some keys (mapped to A) happens to B
>>
> I imagine B resurrects at some point here?


Sorry, I meant a state transfer from A to C ! (B remains dead)


>  If not part of the state is transferred to C (and potentially D if 
virtual nodes are configured).
>> - As part of the state transfer from A to B, do we iterate through
>> the
>> data stored in A's cache loader ?
>> Â  Â (Because if we only iterated through the in-memory data on A, we'd
>> not transfer K)
>
> yes if you have the fetchPersistentState=true.


Even for mode=DIST ?


-- 
Bela Ban, JGroups lead (http://www.jgroups.org)