[infinispan-dev] Rolling upgrades improvement proposal

[Tristan Tarrant]

We should use versions.

Tristan


On 02/13/2013 11:05 AM, Manik Surtani wrote:
> During a push, wouldn't you hit consistency issues with ongoing 
> (applictaion-initiated) writes on the new cluster?
>
> On 13 Feb 2013, at 09:09, Tristan Tarrant <ttarrant at redhat.com 
> <mailto:ttarrant at redhat.com>> wrote:
>
>> Hi all,
>>
>> the current implementation of rolling upgrades is lacking in a few 
>> areas which I think warrant urgent attention in the scope of JDG 6.1 
>> (i.e. for the 5.2.x-cycle):
>>
>>   * support for rolling upgrades from JDG 6.0.x to JDG 6.1.x
>>   * efficiency of the bulk key synchronization (all keys are
>>     serialized into a single key which the target cluster uses to
>>     *suck* all data from the source cluster).
>>
>>
>> During the Infinispan 5.2 cycle I added support in 
>> RemoteCache+RemoteCacheStores to be able to fetch the entries 
>> complete with metadata (i.e. expiration/maxIdle). Unfortunately this 
>> feature is not available in Infinispan 5.1, and therefore the 
>> implementation may only be able to fetch naked key/values, losing 
>> mortality information.
>> To partially overcome this issue, and also to solve the above 
>> efficiency issue, I would like the synchronization phase of the 
>> rolling upgrade to be a push operation from the source cluster to the 
>> target cluster: instead of dumping the keyset into a single key, the 
>> source cluster would initiate a distributed task which would cycle 
>> through the entire keyset and PUT to the target cluster complete with 
>> the correct expiration information (if the source cluster uses JDG 
>> 6.1 this could probably be a GET, which would trigger the usual 
>> getWithMetadata).
>>
>>
>> Comments, thoughts.
>>
>> Tristan
>>
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>
> --
> Manik Surtani
> manik at jboss.org <mailto:manik at jboss.org>
> twitter.com/maniksurtani <http://twitter.com/maniksurtani>
>
> Platform Architect, JBoss Data Grid
> http://red.ht/data-grid
>
>
>
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