[infinispan-dev] Eventual Consistency in Infinispan

[Faseela K]

Hi Dan,

   Thanks for the information.
   Am using implicit transactions only..
   And i am on Infinispan - 5.3.0.

Thanks,
Faseela

________________________________
From: infinispan-dev-bounces at lists.jboss.org [mailto:infinispan-dev-bounces at lists.jboss.org] On Behalf Of Dan Berindei
Sent: Friday, August 23, 2013 6:49 PM
To: infinispan -Dev List
Subject: Re: [infinispan-dev] Eventual Consistency in Infinispan

Are you using explicit transactions or only implicit transactions?

As of 5.2, non-transactional caches use a scheme where the modification is sent to the primary owner, which then sends the modification to the backup owner(s). The primary owner waits for responses from all the backup owners, and the originator waits for a response from the primary owner.

In optimistic caches, one-phase transactions are much simpler: the originator just sends the modification to all the owners, and they all apply it. Execution order is preserved for transactions originating from the same node, but transactions originating from different nodes can be applied by the owners in any order.

So implicit transactions with use1PcForAutoCommitTransactions="true" can certainly be faster than non-transactional operations, but I wouldn't recommend using them because they aren't atomic. (To be fair, there are also some problems with atomicity of non-tx operations during state transfer that we're just fixing now - e.g. https://issues.jboss.org/browse/ISPN-3357)

Cheers
Dan



On Mon, Aug 19, 2013 at 4:47 PM, Faseela K <faseela.k at ericsson.com<mailto:faseela.k at ericsson.com>> wrote:
Hi Tristan,

  I was just comparing the performance of synchronous transactional and synchronous non-transactional writes in replication mode.
  And I see, transactional writes were taking lesser time, than non-transactional.
  Is it expected behaviour? My transactional config has the following properties :

        syncRollbackPhase="true"
        syncCommitPhase="true"
        cacheStopTimeout="30000"
        use1PcForAutoCommitTransactions="true"
        autoCommit="true"
        lockingMode="OPTIMISTIC"
        useSynchronization="true"
        transactionMode="TRANSACTIONAL"

  Or Am I using some wrong configuration?

Thanks,
Faseela

-----Original Message-----
From: Tristan Tarrant [mailto:ttarrant at redhat.com<mailto:ttarrant at redhat.com>]
Sent: Monday, August 19, 2013 6:28 PM
To: infinispan -Dev List
Cc: Faseela K
Subject: Re: [infinispan-dev] Eventual Consistency in Infinispan

Infinispan does not implement eventual consistency yet.

Tristan

On 08/19/2013 02:39 PM, Faseela K wrote:
> Hi,
>    I am using Infinispan - 5.3.0 in clustering mode.
>    I have a transactional configuration, in replication-synchronous mode.
>    I want to know, whether eventual consistency is supported for
> synchronous replication in 5.3.
>    Could someone please brief how eventual consistency works in
> infinispan context?
> Thanks,
> Faseela
>
>
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