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 <[email protected]
<mailto:[email protected]>> 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
[email protected] <mailto:[email protected]>
twitter.com/maniksurtani <http://twitter.com/maniksurtani>
Platform Architect, JBoss Data Grid
http://red.ht/data-grid
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