[infinispan-dev] transaction/query/mapreduce over hotrod

[Mircea Markus]

On 15 Jul 2011, at 18:06, Manik Surtani wrote:

> I think this is fine as a wiki page, and let users extend/hack in this functionality for now, but IMO we need to properly engineer distributed XA over Hot Rod (with a tx broker, etc. as we designed some months back).
+1. I've added an wiki[1] and started by making it clear to the users that this is a *workaround* and proper functionality should be used when available.
[1] http://community.jboss.org/wiki/WorkaroundForSupportingTxOverHotrod
> 

> 
> It's good that we have detailed this prototype, but I would say put it up on the wiki (not official docs) and point people to it each time they ask.  Maybe someone will implement it and contribute it back.  Otherwise, I would say wait for 5.2 for a full distributed XA impl.  :)
my thought exactly :-)
> 
> On 15 Jul 2011, at 12:53, Mircea Markus wrote:
> 
>> Hi,
>> 
>> As there is a high community demand for having these operations in place, and most of these are targeted for post 5.1 releases, I thought about a workaround for having this functionality in place. 
>> I hijacked Hotrod's put operation and added a custom interceptor, so that if a certain object is being "put" into remote cache, the server side interceptor jumps in and runs transactions.
>> This doesn't look too bad for the user, e.g. for supporting transactions:
>> 
>> RemoteCache rc = getRemoteCache();//from somewhere...
>> 
>> //this is what we'll use for running remote transactions over hotrod
>> BatchEnabledRemoteCache berc = new BatchEnabledRemoteCache(rc);
>> 
>> berc.startBatch(); //everything from here to endBatch call is a single transaction
>> berc.put("k", "v1");
>> berc.put("k2", "v2");
>> berc.put("k3", "v3");
>> berc.endBatch(true); // all or nothing!
>> 
>> 
>> Of course this won't work with other clients than the java client, but I think most of our users are using that one ATM. 
>> Currently there's only support for transactions but this approach (and the code) can be easily extended to mapreduce and querying. 
>> I added s short description on how this can be used [1], also the source code is available here[2].
>> 
>> What do you think about it? Is it worth suggesting to the users this approach(and possibly the code as well)?
>> 
>> Cheers,
>> Mircea
>> 
>> [1] https://github.com/mmarkus/ops_over_hotrod/wiki/Usage-guide
>> [2]https://github.com/mmarkus/ops_over_hotrod
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> 
> --
> Manik Surtani
> manik at jboss.org
> twitter.com/maniksurtani
> 
> Lead, Infinispan
> http://www.infinispan.org
> 
> 
> 
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